Dealing with Pest Issues in Container Vegetable Gardening

Erica3 Comments
Close up of a gey squirrel eating potted plant sitting ontop of a brick wall.
Wildlife can be cute, but also destructive! Photo via Adobe Stock

You’re happily growing lettuce in a salad table, watching the little seedlings get bigger, and then one day half of them have been dug up and tossed aside. Or you’re about to harvest your kale and then realize it’s full of holes and little green caterpillars. Or your eggplant leaves are suddenly nothing but lace. Maybe someone is stealing your tomatoes, or—more insultingly—taking a bite out of each of them. Or maybe everything is just… GONE.

Pest issues are not unique to container gardening, of course—all veggie gardeners deal with them. But just as containers have their pluses and minuses in every aspect of food growing, they sometimes provide specific challenges and benefits when it comes to dealing with pests – whether insect or animal.

By the way—let’s acknowledge here that the creatures we’re talking about are just trying to get along and feed themselves. They don’t know that they’re putting us to extra trouble (even if it really seems like squirrels in particular are just trolling us). It would be great if we could jall just get along without harming each other. So the proposed solutions below don’t go as far as hurting or killing anything (if you want to use pesticides against insects, that is up to you, though please be sure to carefully follow the label instructions). These methods all follow four principles: Location, Exclusion, Deterrence, and Distraction.

PART ONE: INSECTS

Here’s a typical scenario from Home and Garden Information Center’s Emily Clark-Waterson:

I planted kale in a flower box in the spring in a new self-watering flower box container, hanging off my balcony railing. It grew beautifully and I was able to clip young leaves and let them keep growing until the summer weather got too hot. I planted it again in late August for a fall harvest, except this time I started to notice some leaf damage and found a type of Imported Cabbageworm. These moved fast and left little to be harvested. They like to hide along the midribs. Lesson learned: Always cover your brassicas with insect netting or floating row cover to help prevent this. A small piece of tulle from a craft store works well, or you can purchase various-sized mesh bags to put over containers. I won’t be making that mistake again.

Kale leaves with large holes and small green caterpillars resting on the leaves
How many cabbageworms can you find? Photo: Emily Clark-Waterson
A small green caterpillar on the underside of a kale leaf.
They really can be camouflaged in the leaves. Photo: Emily Clark-Waterson
A larger green caterpillar rests along the midrib of a kale leaf with large holes in it.
This one has eaten well! Photo: Emily Clark-Waterson
Two containers with vegetable plants sit along a white picket fence. Each container we had a tomato cage and piece of tulle draped over it
Prepared for pests this year with tomato cages and tulle held together with clothes pins. Photo Emily Clark-Waterson

This is a great example of Exclusion. In fact, covering plants with materials like this solves the majority of insect problems—and it’s so much easier and cheaper in a container than covering a long row in an in-ground vegetable garden. Here are some other examples of plants in the brassica family being covered to protect them:

Fine mesh instect netting stretched over plsatic hoops that are over a container of greens.
Insect mesh and hoops over Asian greens. Photo: Lily Bruch
a container on the edge of a raised bed garden with a sheer cloth covering some greens growing. The cloth is draped over and tied around the conatiner with a black string.
Floating row cover over brassica plants keeps caterpillars and other pests away. Photo: Robin Ritterhoff

Plant covers work against other insects as well, for example, to keep flea beetles off of eggplants. But in this case, growing in containers provides another advantage, one of Location. Erica Smith has had success over the years by growing eggplant in containers on her deck, which keeps them well away from the flea beetles in the soil below. MG Robin Ritterhoff also uses this method, making sure to replace at least the top third of the potting soil every year in case beetles are lurking. But MG Lily Bruch says her eggplants still get eaten despite growing on a deck, so she uses row cover and also plants marigolds in hopes of Deterrence. Sometimes strong-scented plants either confuse or annoy insects and keep them away from your vegetables. It’s worth trying, since flowers also bring in much-wanted pollinators and other beneficial insects.

And what if the insect eating your plant is actually beneficial? MG Mary Anne Normile writes:

[It’s a tough call] when Eastern black swallowtail caterpillars feed on container parsley. I love the butterflies, but the caterpillars can denude a parsley plant in short order. No good solution unless you have another desirable (to the caterpillars) plant to relocate them to, except possibly to have a fresh batch of parsley seedlings on hand to plant for the short period after the caterpillars stop feeding and the end of the growing season.

If you have room, you can plant extra herbs in the parsley family, such as dill and fennel, which the swallowtail caterpillars will also enjoy. (Also make sure to have lots of nectar-producing flowers for the adult butterflies.) You could also cover up a few of the parsley plants to keep them just for you.

When pest problems arise in container plants, make sure you address them quickly, because it’s easy to lose your entire crop in very little time.

PART TWO: ANIMALS

(Yes, insects are animals; let’s not be pedantic.)

Erica here:

This is a photo of the gate to my old vegetable garden:

A half eaten tomator sits ontop of a wooden railing of a gate.

This is a typical squirrel move. Didn’t even eat the whole tomato and left it in an obvious place just to taunt me. Photo: Erica Smith

And this year, I have a squirrel who loves Swiss chard:

Squirrel seen through a window screen sitting on the edge of a planter on a deck eating lettuce.
It ate every single seedling out of the deck planter, leaving the lettuce alone, and then climbed into my garden and snacked on the beet leaves. Oh well, no Beta vulgaris for me this year! Photo: Erica Smith

Mary Anne writes:

I have had squirrels … dig up freshly planted basil in containers. They seem to love fresh soil. They don’t eat the basil, they just dig up the plants and sometimes toss them out of the container. I replant them and sprinkle the surface of the soil liberally with cayenne (the cheapest stuff, not Penzey’s), repeated after a rain, and that deters them. Once the basil plants are large enough, the squirrels don’t bother them.

Squirrels do instinctively dig in fresh soil, sometimes burying nuts, but other times looking for food or following up an interesting smell. Lily reports that they dig up her lettuce seedlings; her solution is to cover the container with a metal grid or chicken wire.

Planter box on a deck with lettuce plants growing in it. Metal chicken wire is formed over the top.
Chicken wire to exclude squirrels Photo: Lily Bruch
Salad greens grow up through wire mesh in a planter box on a deck.
Metal wire grid to exclude digging squirrels Photo: Lily Bruch
A white flower box with salad greens sits on the edge of a flagstone path. A pink netting food tents resting rests on top of the container blocking wildlife from digging.
Picnic food tents resting over a container is enough to keep the squirrels from digging up new lettuce seedlings. Photo: Emily Clark- Waterson

Lest you think this section of the blog is all about squirrels, they are, in fact, one of the worst pests for container gardeners (and veggie gardeners in general). They can climb anything, and they eat a wide variety of foods. And they are determined. They may be the hardest animal to stop once they start bothering your garden. Except possibly for raccoons—and former MG Nancy Moses had both of them!

Here’s Nancy describing the year she planted vegetables in containers on her second-story deck—in a yard surrounded by a six-foot fence but that backs up to woods.

The squirrels and raccoons climbed over our chain link fence, up the 13 steps to the deck, taking over the territory as their own.  The resulting poop was unpleasant!  The light-weight, conniving, hungry squirrels politely climbed over the netting held up with metal stakes in each tomato-growing pot; and the raccoons knocked over the pots and anything else in their way toward achieving their goal of mass destruction and hunger gratification. 

Nancy says that after that, “You could say that I quit; but I view it now as having just politely surrendered.” And honestly, how can you blame her? She tried the principles of Location—putting the pots up on a high deck—and Exclusion. Maybe the netting could have covered the plants more thoroughly, but the raccoons still would have knocked the pots over. The only real solution would have been Total Exclusion, meaning a fence that completely surrounded and covered the pots, which does not lead to enjoyment of the deck by humans.

So back to those principles. Location often works (in less extreme circumstances) by keeping plants in pots up high where some animals won’t venture. Most deer (we can never say all) won’t climb up steps and some won’t even venture close to a human home. Rabbits are short and don’t climb, so higher planters are unreachable. A balcony location keeps even groundhogs off, though probably not squirrels and certainly not birds.

Exclusion with row cover or netting can keep some less determined animals and birds away. Fences are another solution—you can fence off part of a deck or patio, or put your containers inside a fence in the yard (or use them as part of your regular veggie garden). Again, if you have serious squirrel, raccoon, or bird issues, only a garden enclosure with a roof will help.

Deterrence can mean using strong-scented plants to warn away animals that don’t enjoy those smells. It’s no guarantee, but maybe will stop the casual visitor.

Colorful wooden planters stacked agains an outside side to a building with herbs, annuals, and strawberries.
Colorful planters hold strawberry plants up high, and a “citronella plant” scented geranium as one of the strongly-scented deterrent plants to offend visiting herbivores. Photo: Erica Smith

In extreme cases, you can revert to growing only these sorts of plants. Herbs like rosemary and thyme, onions and their relatives, and hot peppers may be unattractive to animals.

There are other methods of deterrence if you want to try automatic water sprayers, constant noise, or bird scarers of various types. Avoid sprays that are meant to repel deer if they contain any ingredients you wouldn’t want to consume.

Distraction means giving our animal friends something else to think about. Some garden writers advise providing an alternate source of food, such as edible plants closer to the animal’s habitat, but be wary of bringing in an entire extended family that will reach your closer-to-home plants eventually. Also, be sure to keep compost containers secure if they hold food scraps, and keep fallen produce cleaned up. (We have not talked about rats so far in this post, and let’s not start now.) But do make sure animals and birds have a water source they can visit—sometimes they are eating your vegetables because they’re thirsty.

If possible, try to provide natural sources of food by planting shrubs and trees (preferably native to your region) that grow seeds, nuts and fruits. If you don’t have room yourself, use our resources to learn about native plants and try to convince neighbors or anyone else who controls plantings in your neighborhood to grow them.

Dealing with pests can be challenging, but it feels great when you rise to the challenge! Growing in containers can sometimes help you combat pests, such as when you can easily cover a pot or place it somewhere the pests can’t get to. And if you need to take a season off to regroup, it’s so much simpler to just empty the pots and put them away, rather than having to close down a big garden. Do some research, find some solutions, and come back refreshed to try again!

Share your struggles and triumphs in the comments—and best wishes!!

By Erica Smith, Montgomery County Master Gardener. Read more posts by Erica.

Enhance Biodiversity in Your Vegetable Garden by Planting More Flowers!

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A view of a fenced in vegetable garden with Salad tables in the forground and multiple raised garden beds full of various vegetables. Bright orange marigold flowers line the edges of the raised beds and there are wood chip paths inbetween the planting areas.
Marigolds line the edges of raised garden beds, bursting with vegetables in this county extension demonstration garden. Photo: Jon Traunfeld

A practice generally used in agricultural contexts is that of floral supplementation. In today’s blog, I would like to dig a bit into this idea and present some strategies to implement it at smaller scales, like small vegetable gardens and green spaces. Read along to learn a bit more!

What is floral supplementation?

Agriculture using western methods generally leads to losses of plant biodiversity in and around fields, mostly because it transforms diverse spaces into large monocultures (the crop fields). This, in turn, reduces the ability of the ecosystem to regulate pests, maintain pollination and eventually can negatively affect yield and production, along with increasing environmental erosion. As a response to these needs, strategies have been developed to increase biodiversity in agricultural contexts, and one of those is floral supplementation. In this strategy, the areas surrounding the crop fields are planted with diverse floral mixes or hedges, or the crop rows are intercropped with flowering plants. Such approaches improve soil quality and reduce erosion, increase diversity of plants and animals associated with them, and in many cases lead to improved pest control and pollination of the crop. Although this is a practice more or less widespread and recognized for production fields, it is not often officially promoted in smaller areas such as gardens or the green spaces that surround them. Let’s fix that! 😊

Why does floral supplementation work?

The idea behind these practices is that they increase the spatial and plant resources available to the local biotic community. By increasing the number of plant species present in an area, the different types of food and nesting resources are also increased and become more complex. For example, there may be flowers that bloom at different times of the season, that produce different types of nectar and can support different pollinators, fruits that support different insects and birds, plants of different heights and structure that can offer shelter to different organisms. These modifications eventually lead to more diverse animal communities being present in the area where the supplements are added. From the point of view of the benefits of these changes on the actual performance of the crop field, this diversity promotes the presence of biological control of pest agents (e.g., predators of pests, parasitoids), as well as increases the diversity and abundance of potential pollinating species. The presence of a more robust plant community can also promote soil retention through the presence of more roots to physically retain it, reducing erosion and water runoff.

Tomato plants with green tomatoes growing in a raised garden bed with a railing in the background. Interspersed plantings include basil, and chard.
A way to implement floral supplementation in small spaces is through the combination of different crops on the same pace, such as offered by the idea of companion plantings. Photo: Steph L.

Floral supplementation in gardens

Although the extent of floral supplementation done at the agricultural scale can not be reproduced at the garden level, the same principles can be implemented, especially if the gardening space is not necessarily embedded in a very biodiverse context. Here are some ideas on how to do it.

Intercropping and Companion Planting

A cool way to both increase diversity and production per unit of area is the use of intercropping with companion plantings. Here, different crops can be interplanted, with rows alternating species, or with several crop species planted in a mixed way in the same part of the garden. This relates to the idea of companion planting, where species that are planted together are selected for their ability to successfully coexist and support each other. The table gives some ideas on potential combinations to promote and avoid.

A table with a list of Crops on the left column, companion plants in the middle column, and incompatable plants in the right column. The link to Virginia Tech Extension will lead to a PDF.

Companion planting promotes the interplanting of different crops/herbs, with species known to be compatible and incompatible in these plantings. Table from Virginia Cooperative Extension publication, Companion Planting in Gardening

Hedgerows

Green bushes with pink flowers along a grassy area under trees.
Especially if planted with native species, hedgerows can offer a complex structure for a lot of animal diversity to establish close to our gardens. Photo: M. Gimber.

This strategy can be especially effective if there is a lot of room around the garden plot. Instead of leaving that as a mowed space, it is possible to turn it into a structurally and species-diverse space! For this, one can consider planting sets of native shrubs/small trees that can provide complex shelter spaces and flower/fruit/seed resources for many animals (including humans! 😛 ). Some choices I really like for our area are fringe trees, spicebushes, witch hazels, hazels, pawpaws, serviceberries, native elderberries, or redbuds. Of course, not all these species are appropriate for all areas, so depending on the level of light and soil conditions, some may be preferred over others.

Flower Strips

A close up of Monarda or beebalm with red blooms
Even when not much space is available, the planting of native herbaceous plants can lead to an important bump in diversity around our vegetable gardens. This strip of Monarda, Solidago, Penstemon, Rudbecia and some other native plants is directly adjacent to my vegetable garden and attracts many pollinators and predators such as wasps and mantids. Photo: A. Espindola.

Flower strips are also a great choice, and if space is available, one can easily turn them into a small floral meadow. These spaces can be planted with seed mixes, which can be purchased from seed companies specialized in the establishment of native meadows. (Be sure to review the species list since some meadow mixes can contain invasive or borderline invasive plants, others may contain annuals like Cosmos.) If the space available is not very large, it may be more practical to just plant a set of native flowers that bloom at different times through the season. Check out this other post where I direct people to some specific plant lists that can be handy for our area. Especially if the species chosen are perennial, the planting will lead to a long term establishment, and if wanted, new plants can be added over the years, as some species become more established.

By Anahí Espíndola, Associate Professor, Department of Entomology, University of Maryland, College Park. See more posts by Anahí.

Anahí also writes an Extension Blog in Spanish! Check it out here, extensionesp.umd.edu, and please share and spread the word to your Spanish-speaking friends and colleagues in Maryland. ¡Bienvenidos a Extensión en Español!

A Personal Experience: Learning Some Tricks for Container Gardening on the Eastern Shore

Maryland Grows2 Comments
Wooden planter box with a decorative chalkboard sign reading 'FRESH PRODUCE FROM LOCAL FARM' outdoors on a patio with grass and trees in the background.
Elevated container gardens provide convenient access to fresh, home-grown herbs and greens. Photo: Joan LaHayne

My transition from traditional, large, in-ground, tilled vegetable gardening to container gardening happened out of necessity. In 2015, my husband and I moved from Western Howard County, where we had lived on a large lot with full sun, to the Eastern Shore, with just under an acre and lots of shade/part shade throughout the yard. Most of our full sun and open space was in the front and side yard, both visible from the road. Additionally, we needed to install a sand mound septic system in the limited space we had. This would add further restrictions on what and how we could plant because deep-rooted plantings/tilling are restricted.  We decided that raised beds would be a solution because they would be aesthetically more attractive and could also provide protection from roots interfering with the septic system. 

Installing Raised Beds

Raised beds can be custom-built or purchased as a kit to assemble. We chose to build our own. We started with 4 plots measuring 8’x 5.5’ feet and approximately 1’ deep. The first beds were built using pressure-treated wood. The building material you decide on is a personal choice; they all have their pros and cons. New pressure-treated wood no longer contains arsenic, but we chose to change building materials when adding additional plots. A neighbor had Trex boards from a deck remodel, and we were able to recycle those for the additional plots. We filled the boxes with a mixture of compost (home-grown), leaf pro, horse manure (we live near Assateague), and existing soil. Although our first harvest was slightly disappointing, each year the soil quality improved, as did our vegetable yields. Each year, we typically add compost and manure, but a recent soil test revealed that this practice is creating an imbalance in the soil (too much phosphorus). Annual soil testing of each bed is a beneficial practice for us, and will hopefully improve the quality and quantity of our harvest. Typically, yearly testing isn’t necessary, though.

Adding Containers

After the first year, I realized I wanted more space for herbs and edible flowers, preferably planted closer to the house. We designed 2-foot-high long containers that would surround the existing concrete patio, closing it in. A gate and fire pit completed the design, resulting in the additional benefit of keeping young children and dogs safely away from the water. Because the boxes were so much higher, a barrier was needed to separate the top (1 foot of soil) from the bottom (empty). Our first mistake was not laying landscape fabric on the shelf to prevent the soil from running through the boards when watered. Once we corrected that, the soil remained in place, and the boxes retained water more efficiently. These boxes are beautiful and easily accessible. Because they are so close to the house, they are somewhat protected from winter winds and frost, often allowing greens such as kale, chard, parsley and collards to winter over. Additionally, the height of these gardens prevents animal “snacking” and makes planting and weeding more comfortable. 

A red concrete block patio showing container beds and a covered firepit around the edge. A lawn and wooded area in the background.
Adding the gate and firepit completed our patio space to be a functional area to relax and harvest fresh produce! Photo: Joan LaHayne
Wooden raised container beds lining a patio area in an L shape. a metal spiral staircase is also shown leading down to the patio.
Fresh spring greens emerging in the raised containers are a welcome sight. Photo: Joan LaHayne

Watering

All of the beds require more water than traditional in-ground gardens. We have still not figured out an easy soaker system, but my husband loves to water, so we monitor the beds closely and water as needed. Our goal this summer is to install soaker hoses on the first two beds, utilizing water from a rain barrel nearby. We have added a few more raised beds along the property line where we have access to maximum sunlight but are far from a water source. One contains asparagus plants that require little water (because harvested early in the spring) and the others are used for root vegetables. Eventually, we will try to find a better way of getting water to those gardens as well. 

Limited Space Solutions

The most consistent challenge of container gardening for me has been limited space. Working as a volunteer in a local community garden has allowed me to learn tricks on how to maximize yields by observing the gardening practices of others. I noticed many different ways my fellow gardeners added structures to allow vines to climb. I loved the idea of an arch that would provide a shady pathway through the garden. My husband constructed a 10’ archway using heavy reinforcement wire that was secured to the outer boards of 2 parallel beds. The resulting design was successful! Last year’s cucumber, butternut squash and spaghetti squash plants found their way up and over the arch, producing fruit that dangled from above. Harvesting was made easy and the display was beautiful. 

Large wooden raised beds in a lawn with a metal fencing arch connecting them. THere is a shed in the background and some crops growing in the beds.
Adding the metal fencing arch between the beds helped with the limited space in the raised beds. Photo: Joan LaHayne

Container gardens are beneficial in many ways. They can be placed in a variety of spaces throughout the yard and can be dismantled and moved if growing conditions change (increasing shade, for example). Because of the limited square footage in each, weeds are much easier to control. No tilling necessary. If animals are taking too much of your harvest, raised gardens can easily be fenced or built higher to keep plants out of reach. Container gardens can be incorporated into already existing or planned flower beds, creating interest and beauty, as well as expanding pollinator habitat. Although I continue to learn gardening tricks and practices, I have found container gardening to be an ideal solution to growing vegetables year-round here on the eastern shore.  

By: Joan LaHayne, Master Gardener in Worcester County, Maryland.

Check the Temperature Before You Plant!!

Erica3 Comments
Several trays of pepper seedlings in quart-size pots sit on a deck getting used to outdoor temperatures.
Pepper plants hardening off

A short post today, in which I make my annual plea to hold off on planting summer vegetables until it’s warm enough. Please – your garden will thank you later!

We have some guidelines on the HGIC website about when to plant vegetables and how to harden them off (get them used to outdoor conditions). Remember, though, that planting isn’t about dates; it’s about temperature. It is not a hard-and-fast rule that your tomatoes should be in the ground by Mother’s Day. What if it’s 40 degrees on Mother’s Day? Bad for outdoor brunch, but also bad for young tomato seedlings.

The round temperature dial of a compost thermometer registering about 55 degrees Fahrenheit.
A compost thermometer is useful for checking soil temps

In general, vegetables that prefer summer’s heat also don’t like spring’s cold. Tomatoes, peppers, squash, cucumbers, and all their friends want soil temperatures over 60F and air temperatures over 50F (including at night). Try to wait to put them in the ground until the forecast shows at least a week of these conditions, with no cold snaps or heat blasts. Of course, spring is full of crazy ups-and-downs (especially this spring) but if you can give the plants a good start, they will tolerate temperature swings better. If a frost is predicted, or really anything below about 45, throw some kind of covering over the plants: heavy-duty row cover if you have it, but a sheet or light blanket will do.

Get to know your garden’s microclimate – if it’s protected from strong winds, plants will tolerate cold better; if it gets a bit of afternoon shade, they will get through high heat with less damage.

You can purchase all kinds of devices to give your plants extra protection, but after trying them all I found I preferred just having some patience. If you do use them, make sure they’re easy to put up and take down – struggling with a complicated shelter in wind and rain is no fun, nor is removing the whole thing again when it’s 85 the day after dropping to 39.

I know, all my plants are huge too, and really want to go outside. But I’m going to wait until it’s time.

By Erica Smith, Montgomery County Master Gardener. Read more posts by Erica.

Gardening with Life Changes: a reflection on growing in containers

Emily Clark Waterson2 Comments
Calico cat resting inside a large pot with plants and colorful garden decorations on a balcony
Zelda the cat loves to lounge amongst the plants in the sun, despite the attempted deterrence of forks, chopsticks, and watering bulbs. Photo by: Emily Clark Waterson

I imagine for many gardeners, life changes may also come with garden changes. For instance, maybe you relocate and the sunny plot you once had is now a tree-covered shady oasis. Maybe the time you were able to devote to your garden shifts with the expansion of your family. New babies are a welcome addition, but boy, do they take a lot of time! Believe me, I know! That first week the weeds took over. Your job may change and now you have a longer commute or different work hours. You may decide to introduce a new pet that loves to dig or doesn’t respect that new shrub you are trying to establish. I have experienced many of these changes, which have allowed for a variety of gardening scenarios. Each life change has brought a new gardening challenge to explore and I welcome them all!

How it started…

I started my mid-Atlantic gardening life in 2011 with about 1/3 of an acre in a typical suburban neighborhood. I grew up in Northern New York (mostly zone 3-4) and then spent a few post-college years in the Southwest, so I found it exciting to learn about the planting palette of the Piedmont Region. At the time, I was working at a local garden center. That employee discount was a big bonus! I transformed a lot of turf and compacted construction soil into vibrant garden spaces. They showcased native plants, various edibles, and some fun non-invasive ornamental species. I introduced multiple trees to the barren backyard. I built some raised-bed veggie gardens and I finally found a happy spot for rhubarb to grow, after relocating it about five times. (Rhubarb prefers cooler climates but there are some heat-tolerant varieties if you’re like me and can’t live without it!) I also added the all-important gardener’s gold: a compost pile.

Two 4 by 8 foot raised beds in wooden frames sit along side a fence in a backyard with a path around them lined with bricks.
Newly built raised bed vegetable gardens waiting to be planted. Photo: Emily Clark Waterson
Two toddler aged children sitting on the grass in a backyard holding beets
My forever garden helpers in 2017 with our beet harvest. Photo Emily Clark Waterson
A sunny garden bed with various trees, shrubs, and flowers with a fence in the background and grass in the foreground.
The full sun backyard garden bed was added to soften the corners of what was once a rectangular plot of grass. Photo: Emily Clark Waterson

How it changed…

A recent life change had me relocating to an apartment, resulting in a drastic reduction in my gardening space in 2023. But when life gives you a balcony, you start container gardening! I can’t live without dirt under my nails, or in this case, potting mix. Therefore, the balcony had no choice but to come alive with shades of green! It faced east and also received some shade from a large deciduous Magnolia. This was a change from the full sun, southern-facing backyard I was used to.

I scoured my local thrift stores for plant containers or something that could be repurposed as one. If I could drill a drainage hole, it would be fair game! Fun plates became container saucers to put underneath draining pots so they wouldn’t drip on my downstairs neighbor. Surprisingly, I found self-watering containers for a low cost at a dollar store. To further save money for plants and seeds, I used recycled food containers for seed starting. I optimized space by thinking vertically and splurged on a self-watering railing box. Adding hooks for some hanging plants was a must, too!

I’m a self-proclaimed native plant nerd, so there had to be some natives incorporated. I missed popping out my back door to my herb garden. Being able to clip whatever aromatic additive I wanted for an evening cocktail or our dinner was such a luxury. So, ignoring the eastern-facing orientation, I planted sun-loving Mediterranean herbs in various pots. I love fresh salad greens to harvest in the cut-and-come-again method. With the shadier location, this meant I was able to grow them all summer long in the railing box. Despite the lower light conditions, I tested a spicy pepper and a few cherry tomato plants as well. Guess what? They all grew!

A rectangular plastic container filled with soil with small seedlings emerging, sitting on a railing.
A repurposed food container and lid growing arugula seedlings. Photo: Emily Clark Waterson
Green lettuce plants growing in a black oval planter with soil and wood mulch on a balcony railing.
Having fresh green lettuce growing along the balcony railing was great to snip leaves off and have it grow back. Photo: Emily Clark Waterson
A view of a balcony with many potted plants and a tree in the background
A midsummer view of all the plants in the balcony garden. Photo: Emily Clark Waterson
Tomato plant reaching over a balcony railing to the roof line, held up with twine.
Due to the lower light conditions, the tomatoes grew a little spindly, but still produced. Photo: Emily Clark Waterson
A hand holding 3 red cherry tomatoes with a tomato plant in the background displaying many green tomatoes.
Tomato harvest with more on the way! Photo: Emily Clark Waterson

Challenges

Every gardener knows there is always something to learn from. Here are some challenges I faced:

Every gardener knows there is always something to learn from. Here are a couple of challenges I faced:

  • Cats – We love our cute kitties, who we rescued from a sewer drain at 4 weeks old, but cats and potted plants are a tough combination. Living in 900 square feet, it was important stimulation for them to explore the balcony and get some outside time in a safe setting where they couldn’t hunt wildlife or get hurt. Link liked to eat radish tops, and Zelda nibbled all the Carex (sedge) in my native plant container. (Yes, Link and Zelda – named by my 2 pre-teen boys who like to play video games.) Any open soil became a convenient litter box, so I learned to keep it blocked or covered. Chopsticks from the occasional takeout became repurposed soil blocking stakes. Any container not large enough or heavy enough had the potential to get knocked over (and many did). We learned to live with the nibbling, and I grew lots of wheat grass for them to keep them from eating MY plants. It didn’t totally work, though.
  • Heat and watering: Containers dry out much quicker than soil in the ground. I used many watering bulbs or those terra cotta watering spikes with bottles to help keep plants watered on the hottest days of the summer. If you have access to a hose bib, you can invest in a small drip irrigation system set on a timer, which would be more regulated for water hogs like tomatoes.
  • Plant waste: Where does it go to decompose? I didn’t want to add more waste to the garbage bags we had to haul out to the dumpster, and for environmental purposes, composting is preferred. I ended up using a 5-gallon bucket to collect spent potting mix, leaf clippings, and deadheaded flowers. On occasion, I added old potatoes, moldy fruit, or veggie scraps to balance the greens and browns. They slowly broke down, and if it didn’t get reused, at least it was easier to carry down 3 flights of stairs. My city had a compost collection service that you can sign up for, but unfortunately, they didn’t pick up from the apartment complex.

How it’s going…

Another life change has now brought me back to a yard. Since we are renting for now, I will continue container gardening, but with much more space! [Insert grow bags!] And just in time for our Grow it Eat it Year of Container Gardening! I’m excited about what this growing season will bring!

Thus far, I have overwintered spinach from the balcony garden; how it survived multiple freezes and probably fully frozen potting media, I have no idea, but that’s why plants are so cool! We’ve planted arugula and some mixed salad green seeds that are starting to show signs of life, peas that can climb our porch railing, and plenty of culinary herb transplants from the local garden center. I needed something instant to harvest!

A container sitting on porch steps showing a small Thai basil plant in the back and basil seedlings in the front.
Thai basil transplant and basil seedlings are popping up. April 18, 2026 Photo: Emily Clark Waterson
Herbs in a container with a road in the background.
The sage overwintered but we just added thyme and oregano. Chive seeds were planted in the empty space. April 18, 2026 Photo: Emily Clark Waterson
Overwintered spinach made the move with us and is reviving its growth in the railing box. Arugula seedlings are just starting to come up as well. Date: April 18, 2026 Photo: Emily Clark Waterson

We have a bit more sun now, and the kitties are confined to their screened-in “catio”, so some challenges have been addressed. My native plant container that Zelda liked to lounge in succumbed to heat and lack of watering while on vacation and then the freezing temperatures over the first winter, so I replanted with more drought-tolerant native shade perennials late last fall. Happy to report that they all survived and are returning vigorously! I’ve added a container variety of thornless raspberry, Bushel and Berry® Raspberry Shortcake®, to experiment with and excite our kids. Tomatoes, carrots, Thai peppers, and container-sized cucumber varieties are to come! We’ll see what our yields will bring and what interesting native plants I can add to aid in pollination and beneficial insect populations. Now, to just keep the cats from eating the house plants….

A container with various green plants in different textures with a white picket fence in the background.
The re-planted native plant container features: Zigzag Goldenrod, Appalachian Sedge, Woodland Stonecrop, Christmas Fern, Alumroot, and a hidden Common Blue Violet. Photo: Emily Clark Waterson
A close up of flowers on sedge blades with a ceramic green bird in the background.
The Appalachian Sedge in bloom! You can see the violet blooming in the background. Photo: Emily Clark Waterson
3 containers with different young shrubs inm a corner of a yard against a white picket fence.
The new Raspberry Shortcake in the white container (right) and young native woody plants: Red chokeberry (center), and saplings of Spicebush and Redbud (left). Photo: Emily Clark Waterson

Takeaways:

  • Just because you don’t have a plot of land doesn’t mean you can’t grow something!
  • Lack of full sun does not equal zero veggies – I had that cherry tomato producing well into late October!
  • Challenges provide good, thought-provoking scenarios that keep you interested in growing! Don’t give up if a few plants die.
  • Cost doesn’t have to be a deterrent either – a gallon milk jug with drainage holes and the top cut off worked great for leafy greens.
A wicker basket with many red, orange, and green tomatoes, and 2 purple peppers.
The last harvest from the balcony on November 10, 2025! Photo: Emily Clark Waterson
An apartment building showing 2 balconies with a finger poiting to the top floor. Plants can be seen growing and trailing over the edge.
Our balcony was on the 3rd floor. The vine is a stowaway Creeping Cucumber that must have traveled with another potted plant and ended up growing down to the 2nd-story balcony! Photo Emily Clark Waterson

Wherever life takes me next, I know my garden will follow. We’ll continue to grow and adapt to our new environment, and no matter what, harvest something we can eat!

Happy Spring!

Additional Resources:

By Emily Clark Waterson, Certified Professional Horticulturist & Coordinator, University of Maryland Extension Home and Garden Information Center.

Spring Crops in Containers

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Lettuce and arugula seedlings growing in a terracotta-colored rectangular planter
Salad greens like lettuce and arugula are easy to grow in various sized containters Photo: Erica Smith

Maybe your first thought on starting a container vegetable garden was “I can grow tomatoes!” Which is great—but tomatoes are a summer crop and it’s not time to put them outside yet. You can start your garden even earlier, though, with spring plantings.

Here are a few of the spring crops you can grow in containers:

The only spring crops I would hesitate to grow in containers are large brassicas like cabbage, broccoli, and cauliflower, and even those could be planted in containers—it’s just that you would only plant one per pot, which might not be worth the effort, unless you have space for a lot of pots, no in-ground garden, and a real love of fresh-grown cabbage.

I’m also not a huge fan of potatoes in containers, because they don’t usually produce very much and it doesn’t seem worth the space and expense when potatoes are so cheap to buy. Nevertheless, I’m going to give it another try this year, just so I can report back here!

Here are some tips on planting spring crops in containers:

  • In some cases it may be more practical to start with transplants rather than planting from seed. This allows you to get the spacing just right and eliminates tedious thinning of extra seedlings. It’s also much faster. But seeding also works fine.
  • Consider the shape of the container when choosing a crop (or vice versa). Crops you want to harvest a lot of, like lettuce or radishes, will work better in a wider container. They also have shallow root systems, so the container doesn’t have to be very deep. Whereas if you’re going to grow carrots, make sure you have a container several inches deeper than the expected carrot length.
  • The usual container growing guidelines apply: use lightweight potting mix rather than real soil from the ground; water frequently; apply fertilizer as needed.

Here are some photos of spring crops growing in containers:

Pea plants in a black fabric grow bag with sticks for them to grow up
Chive plants in a rectangular container
Lettuce, arugula and chard in a raised planter with legs
Seedlings of lettuce and brassicas in a square white raised planter

Photo collage from left (click image to enlarge): peas in a fabric grow bag (a great inexpensive option for lots of crops); chives in a rectangular planter (herbs are wonderful container crops); lettuce, arugula and chard in a raised trough planter on my deck; various spring greens in a keyhole garden, which has an area in the middle meant for creating compost to feed the plants. Except for the trough planter, all of these are from the Special Projects area at the Derwood Demo Garden.

This does bring up a question: what counts as a container? The raised keyhole garden and raised trough planter in the photos are much larger than the typical pot or planter, and may be closer to a raised bed. There’s certainly a fuzzy line between the two types of gardening.

To my mind, a container is an object that holds growing medium more likely to be potting soil than real mineral soil from the ground, and that could sit on a deck, patio, or driveway rather than being situated in a typical vegetable garden layout. I definitely consider my trough planter to be a container, if a very large one. The keyhole garden is an edge case, maybe more of a raised bed the way we use it at the Derwood Demo Garden in Montgomery County, Maryland. But it could be a patio planter, so I’m happy to regard it as a container as well.

In any case, it’s time to get those spring crops growing if you haven’t already! Happy spring!

By Erica Smith, Montgomery County Master Gardener. Read more posts by Erica.

Related information:

Growing Vegetables in Containers and Salad Tables

Q: We have some welcome respites of very mild to warm weather in the forecast. When can I put some of the plants I overwintered indoors back outside? I’m sure they miss the better light.

Emily Clark Waterson2 Comments
A vaiegated spider plant and some succulents in containers on a balcony.
Some houseplants are tougher than others but most are not ready for full sun or the cold nights of early April. Photo: Anna/Adobe Stock

A: It’s easy to get caught-up in the moment during those lovely spring-preview days and want to liberate your houseplants to bask in the great outdoors. I know I’m antsy to get mine back outside. Try to wait until at least our last frost, though, which for central Maryland averages about Mother’s Day. Some tropical plant species are more sensitive to cold than others, so you may be able to start the acclimation process for the tolerant ones earlier, if you pay attention to overnight temps and bring them back in when needed. In comparison, some may sulk if they’re exposed to temperatures below 60°F. If unsure, err on the side of caution; exposure to no chillier than 55-60°F is a good assumption.

All plants, no matter how sun-loving they are, need time to adjust to the brighter light moving from indoors to outdoors, so they don’t sunburn. Shade outdoors is usually much brighter than direct light indoors, even though to our eyes it doesn’t look that different. Put anything you bring out into shade first, gradually introducing them to greater amounts of direct light (based on their needs) over a few weeks.

Even plants that need bright light inside don’t necessarily want unobstructed full sun outside, even once acclimated. Potted succulents and air plants, for instance, tend to fare well if shielded from the strongest afternoon summer sun by some dappled shade from either trees or shade cloth, or by a passing shadow from a building or fence.

Various potted plants and herbs growing on a balcony with a railing and a large tree in the background
A cozy balcony garden filled with various potted plants and herbs in mid summer. Photo: Emily Clark Waterson, UMD Extension

By Miri Talabac, Horticulturist, University of Maryland Extension Home & Garden Information Center. Miri writes the Garden Q&A for The Baltimore Sun and Washington Gardener Magazine. Read more by Miri.