A Brilliant Fall Banquet for Birds, Butterflies, and Bees

It’s that most glorious time of year in Maryland, peak autumn, a time of constant change where every day brings new explosions of color. Beyond leaf peeping along our morning commutes, changes large and small are detectable in exquisite detail, if we only pause to step out in nature to look, listen, and smell the fragrance of the season in the air. 

Right now, migratory birds are coming and going, shrubs are blooming and berrying, bees of all stripes are scrambling for the last drops of nectar as fall flowers fade. With some surprisingly low-cost, low-maintenance strategies, you can begin right away to transform your local landscape into a brilliant fall banquet for birds, bees, and butterflies.


At this time of year, wintering birds are beginning to arrive from the north, while some summer visitors linger to enjoy the bounty of fall. Dark-eyed Juncos (Junco hyemalis) are already returning from their northern breeding grounds. I spotted my first juncos of the season flitting about the raised garden beds on Halloween right outside of the Anne Arundel County Extension office. 

cabbage white butterfly
Cabbage White (Pieris rapae) butterflies were introduced to North America and are common across Maryland. Their larvae are considered to be crop pests. They typically reach the end of their adult life cycles toward late October. Photo: S. Small-Lorenz

On the same day, Cabbage White butterflies were still mobbing blooming New York asters in the brilliant noon sunlight on a day of record-breaking late October heat. The viburnum berries had already been plucked, possibly by the Northern Mockingbird (Mimus polyglottos) singing nearby, and its outermost foliage had turned a deep Cabernet red on a chillier night. I suspect that mockingbird has now staked out the American holly berries ripening nearby, as he seeks to maximize his energy intake before winter sets in.

Northern Mockingbird. Photo: Matt MacGillivray, CC BY 4.0

At Howard County Conservancy the day before, I noticed winterberry shrubs loaded with ripening berries, where another singing mockingbird steadfastly stood guard. Native honeysuckle (Lonicera sempervirens) is flowering and berrying simultaneously, gracing the trellis archway into the native plant garden, and the common witch-hazel (Hamamelis virginiana) is blooming, our only witch-hazel to bloom in the fall. 

Taking cues like this from nature can be an excellent strategy for planning our conservation landscaping for year-round color. Planting native berrying shrubs and evergreens not only extends our color palette, it provides natural sources of food and shelter for songbirds like Gray Catbirds (Dumetella carolinensis), Northern Mockingbirds, Cedar Waxwings (Bombycilla cedrorum), Eastern Bluebirds (Sialia sialis), Yellow-rumped Warblers (Setophaga coronata), Ruby-crowned Kinglets (Corthylio calendula), and thrushes as temperatures cool and extra energy is required to fuel up before, during and after migration. 

Depending on your specific location and site conditions, consider planting Maryland native berrying shrubs to enhance your fall bird banquet. These could include northern bayberry, maple leaf viburnum, red osier dogwood, native honeysuckle, black elderberry, native hollies (American, inkberry, and winterberry), huckleberries, and red chokeberry

Leaving fall seed heads standing into winter also provides resources for a whole array of seed-eating birds like sparrows and finches. Even as flowers begin to wilt and fade, they still provide essential nectar resources to native insects that are beneficial for their pollination and pest control services, not to mention as songbird prey. 

So if you are considering what you can do right now for nature and the environment in your own neighborhood, here are a few low- to no-cost fall strategies to get you started right away:

  1. Map out one or more locations that you would like to dedicate to a native shrub planting area. Make note of conditions (wet/dry, sunny/shady, soil type) so that you can select the right plants for your site when the time comes. It isn’t too late to plant native shrubs in most parts of Maryland, but if you choose to wait for spring, you can still start preparing the bed and browsing for fall-berrying shrubs now (see #5)! If you don’t know your soil type, this is the perfect time to do some home soil analysis. Observe where stormwater flows off of your property, and consider planting a mulched stormwater buffer using arborist wood chips and native plants to absorb rainwater which can both help reduce downstream flooding and improve water quality while beautifying your landscape. 
  1. Pledge to leave the leaves this fall. Raking a thick layer of leaves into your designated shrub planting bed will almost immediately start to create habitat, retain soil moisture, and build rich living soils. I call this “Raking by Design.” Think about this – who rakes the leaves in the forest? Towhees, sparrows, jays, bats, squirrels, deer, and many more wild residents…a reminder that leaf “litter” is an important habitat component for many creatures, and it puts essential nutrients back into the soil as the leaves decompose. If you’re concerned about leaves blowing around, it’s fairly easy to contain whole leaves with low garden border fencing, but it isn’t entirely necessary. Consider designating a portion of your yard a ‘no-rake’ wild zone, where you leave the leaves undisturbed, right where they fall.
leaves piled in a garden with a leave the leaves sign
Leave the leaves for healthy soil and habitat. Photo: S. Small-Lorenz
  1. Leave your native flowers standing well into winter, beyond peak bloom. Birds, bees, and butterflies will benefit from the stems and seed heads well into fall and early winter. 
  1. Use fall prunings, cuttings, logs or stumps to create shelter for overwintering birds, bees, and other wildlife. Recycling your “yard waste” is one of the easiest, low cost ways to start building healthy soil and creating habitat to benefit biodiversity in your local landscape. This can take the form of a brush pile, wood pile (situated well away from your home’s foundation), leaving a natural stump instead of stump-grinding, or building a simple “bug snug” like the one pictured here.
sticks piled into a pyramid to make a bug snug shelter for insects
A “bug snug” made with cut woody stems, seed heads, and leaves will provide a shelter for overwintering insects, stem-nesting bees, and birds. Photo: C. Carignan
  1. Browse options for native berrying shrubs to plant this fall or next spring that would be right for the conditions in your yard. While browsing native plant resources like Alliance for Chesapeake Bay’s Native Plant Center, also make note of whether the shrubs you choose are dioecious or not, meaning that you may need to consider planting female and male plants near one another in order for flowers to be fertilized and berries to form. Finding native plants locally right when you want them can be a bit challenging when getting started, so take some time to familiarize yourself with Maryland native plant material sources via Maryland Native Plant Society’s native plant shopping resources

Which of these low-cost, low-maintenance strategies are you planning to try to enhance your fall living landscape? Which berrying shrubs might you consider adding to your fall banquet? Leave us a comment below, and don’t forget to let us know which wild visitors are enjoying the fall feast in your neighborhood!

By Stacy Small-Lorenz, Agent, Residential Landscape Ecology, University of Maryland Extension. Read more posts by Stacy.

Q&A: What is a Good Substitute for Spruce?

blue atlas cedars in front of a building
Blue Atlas Cedars on the American University campus in Washington, D.C.
Photo: M. Talabac

Q:  I have always loved the look of blue spruces, and I see many Maryland nurseries stocking them. I’ve heard that I should consider alternatives, though. Why?

A:  Although every plant has something it can be vulnerable to (pests, diseases, environmental stress) and nothing is risk-free, Colorado spruce (Picea pungens), the species with the popular blue-needled cultivars, struggles in Maryland growing conditions. As such, it is at risk for several problems that cause dieback and significant aesthetic damage. Overall, spruces as a group are not well-adapted to high summer heat and humidity, or compacted or clay-dominated soils common to urban or suburban landscaping.

No spruces are native to the state except for the tip of western Maryland, where the locally rare red spruce grows in the mountains. (Maryland Biodiversity Project notes that prior logging and wildfires reduced this already limited population.) You can see from the spruce species range maps on the Biota of North America Program website that no other spruce species grows wild anywhere near Maryland.

Due to the particularly damaging nature of the issues spruces can develop here, primarily from fungal infections — drastic needle browning and shedding, plus branch dieback — I suggest using alternatives if you want a large-statured, pyramidal, and/or blue-leaved evergreen specimen tree. This spruce decline issue is prevalent enough that it has its own University of Maryland Extension web page, “What’s Wrong with my Colorado Blue Spruce Tree?

A substitute plant won’t necessarily look the same (it might have broader or looser branching, or won’t have blue foliage), but it can have a better chance of thriving. Your options will depend on the site conditions, including how much space you have for the plant to mature, though your best range of choices will be for a location in full sun (in summer) with good drainage and no deer browsing pressures.

Few locally native species are evergreen and large-statured, but they include American holly (Ilex opaca), Eastern redcedar (Juniperus virginiana), and Atlantic whitecedar (Chamaecyparis thyoides), the latter of which is rare, unfortunately hard to find for purchase, and limited to the coastal plain in the wild. Several species of pine grow wild throughout Maryland, but their mature habit is quite different from spruce.


Non-native candidates include other holly species or hybrids, Japanese cedar (Cryptomeria japonica), true cedars (Atlas Cedar, Cedrus atlantica, and Deodar cedar, Cedrus deodara), and Western arborvitae (Thuja plicata). Arizona cypress (Cupressus glabra) and atlas cedar come in silvery-blue forms if you want a foliage color similar to blue spruce. While leyland cypress (Cupressocyparis leylandii) is commonly planted, it suffers from some serious shortcomings that can make it short-lived and prone to fungal branch dieback.

Arizona cypress tree
Smooth Arizona cypress (Cupressus arizonica glabra). Photo: M. Talabac

Whichever plants you try, use a mix of species if you’re growing them in a group, like a screen or living fence, rather than mass-planting only one species or variety. This helps the planting to resist future pest, disease, or weather stress problems, since different species have different tolerances and vulnerabilities. That way, a future issue won’t be likely to impact them all equally severely, like a fungal needle cast infection wiping-out a row of blue spruce.

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.

Have a plant or insect question? The University of Maryland Extension has answers! Send your questions and photos to Ask ExtensionOur horticulturists are available to answer your questions online, year-round.

Q&A: Reduce the Height of an Arborvitae?

Arborvitae (Thuja sp.). Photo: Jason Sharman, Vitalitree, Bugwood.org

Q: I need to reduce the height of an arborvitae…. I might take around 5 feet off the top because it’s too big. When should I prune?

A:  While late winter or early spring is generally a good time to prune conifers (needled evergreens), in this case timing won’t matter much, because the amount you want to remove is more than the plant can handle. Instead, it may be better to replace the plant with a smaller-growing option.

Most conifers, including arborvitae, do not regrow foliage when it’s lost due to heavy pruning, deer browsing, or crowding from being planted too close together or too close to a wall or fence. Unlike broadleaf evergreens (boxwood, holly, euonymus, etc.), they don’t have dormant buds along the older stems, lying in wait to grow if the branch or foliage beyond them is removed.

Once the foliage is gone and bare wood is visible, it’s not coming back on that part of the plant. This is the reason why deer-browsed arborvitae are easy to spot, developing a shape sort of like a stemmed flute glass, because the parts the deer can reach become stripped of foliage and never fill back in again, even as the out-of-reach tops get wider.

As conifers age, it’s perfectly normal for the innermost branches to become quite bare, as those older leaves shed over time. They are deliberately jettisoned by the plant because they are being progressively shaded by the outer shell of live growth, so they cost the plant more to keep alive than the meager photosynthesis energy they get back. This will be exacerbated if the plant is sheared, where the foliage tips are lightly trimmed to give the plant a more manicured look, because that makes the layer of foliage casting shade on the plant’s interior even denser.

Pruning cuts that take off that outer layer or shell of younger growth on the branch tips will result in permanent bare areas. Once the foliage is gone from that inner wood, it will not regrow, even if sunlight now reaches the interior due to pruning cuts. This also applies to the main leaders. Reducing the height of a tall arborvitae will stunt the top growth and give it a permanent gap or flat-looking top. If this isn’t really visible from where you typically view the plant, then it’s not necessarily a problem (assuming the pruning cuts seal-over well and don’t develop wood decay). Otherwise, nothing will give the plant its former shape back.

Fortunately, there are lots of compact and dwarf conifer varieties on the market these days. A couple conifer types, like yews, will be able to rejuvenate after heavy pruning. Even so, it’s still best practice to select a plant that should fit in a given space in the yard without relying on pruning to make it fit.

I acknowledge that there are many gardeners that inherit poorly-chosen plants in their new yards, but if or when it comes time to replace them, research your options to make sure you won’t run into the same problem down the road. Plants never really stop growing, though older specimens can slow down. Due to a reduced growth rate, dwarf and miniature cultivars will stay much smaller over the same amount of time as their full-size counterparts, even though some dwarf cultivars can also get larger than you’d expect a few decades after planting.

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.

Have a plant or insect question? The University of Maryland Extension has answers! Send your questions and photos to Ask ExtensionOur horticulturists are available to answer your questions online, year-round.

Mulch Volcanoes Kill Trees

Mulch piled high around trees is harmful. Photo: D. Clement, University of Maryland Extension

I’ve been a bit twitchy lately. I keep seeing mulch piled high around trees and it makes me more than a little crazy. Those mulch volcanoes are so very bad for trees. 

Why? They hold moisture against the bark, inviting rot, pests, rodents, and disease.

With mulch, less is more. One to three inches is all you need. 

Done right, mulch can be a good thing. It suppresses weeds, holds moisture, prevents soil compaction, moderates temperature, and improves soil structure when it breaks down.  

Proper mulch is 1 to 3 inches deep. Photo: UME-HGIC

Mulch can be attractive and create a protective barrier between lawns and plantings. It creates a no-go zone, keeping mowers and weed whackers from damaging tree bark.

A ring of mulch around trees also keeps thirsty grass from robbing tree roots of much-needed water. Water passes more easily through mulch than turf. 

But too much of a good thing is bad. Very bad. So many plants die an early death due to excessive applications of mulch. 

One client had lost three trees in one spot and called me for help. I nearly drove off the road as I approached her home. There were 17 inches of mulch, the bark was black and mushy, and the tree was dead as a doornail. 

Once you start looking for them, you’ll notice mulch volcanoes everywhere. My phone is full of photos of these dastardly cones.  

leave mulched piled too high at the base of a tree trunk
Chipped leaves applied too deeply around a tree as mulch. Photo: Jennifer Foltz

I can’t save all the trees, so I’m enlisting your help. Don’t let mulch volcanoes happen on your watch.  

Know that the type of mulch you choose is important, too. 

Shredded bark mulch is the most popular choice for flower, tree, and shrub beds. It resists compaction, looks good, and is readily available. 

Avoid using chunkier nugget mulches where water flows regularly. Those nuggets float, so they tend to move – sometimes quite dramatically – in heavy rains. 

Consider stone mulches carefully. Leaves, debris, and weeds are difficult to remove, and stones can dry plants with the heat they reflect. Baked Alberta spruce, anyone? 

Also, avoid mulch made from recycled tires. It blocks the flow of air and water to plant roots and can leach harmful chemicals. Plus, it doesn’t break down to feed the soil. 

Regardless of the type of mulch you use, keep it an inch or two away from trunks. This avoids moisture buildup that can cause rot and invite insects and disease. 

Learn more about mulching from the Home and Garden Information Center: Mulching Trees and Shrubs.

I also encourage you to look at mulch alternatives. Not only are they more sustainable, they can save the cost and effort of applying and reapplying traditional mulch. 

Plant groundcovers or a mix of perennials and groundcovers around trees to create a plant community that supports pollinators, beneficial insects, and wildlife.  

Try using groundcovers instead of mulch in your flower beds. Newspapers and straw or untreated grass clippings work well in vegetable beds as does an inch or two of compost.

Untreated grass clippings can be used to mulch vegetables.

So join in the mulch mania. Toss it forth with glee but not too deeply. Or explore some mulch alternatives that not only block weeds, hold moisture, and feed the soil, but provide vital habitat.  

By Annette Cormany, Principal Agent Associate and Master Gardener Coordinator, Washington County, University of Maryland Extension.

This article was previously published by Herald-Mail Media. Read more by Annette.

Q&A: What Screening Plants Fit in a Small Space?

a row of small evergreen arborvitae shrubs near a brick building
‘Emerald Green’ Arborvitae screening a property line. Photo: Miri Talabac, University of Maryland Extension


Q:  I have limited space in a tiny city front yard and would like to block some of my view of the street. What types of evergreens would work well but not get too wide?

A:  The width of the mature plants is the tricky part, since many upright evergreens mature at least 3 to 5 feet wide at their base, and not many are trimmable to keep them smaller. Plant options will depend on whether you have full sun or some shade from nearby trees or the house itself. Few city yards have issues with deer (though some do), so I’ll assume for now that browsing is not a factor.

Soil compaction is a common challenge, and poor drainage (is a roof downspout nearby?) can exacerbate root stress and cause plants to fail. If the site drains reasonably well and receives full sun in summer, your choices include slender-growing cultivars of widely-used evergreens. (Alas, there are very few native options to fit these criteria.) Examples include arborvitae (Thuja), juniper (Juniperus), yew (Taxus), Japanese plum yew (Cephalotaxus), boxwood (Buxus), and holly (Ilex).

Yew as well as broadleaf evergreens like the boxwood and holly can be pruned relatively easily to manage size, since they rebound well. Even so, it’s best to select cultivars that will mature close to the size you can accommodate without having to prune, both to save yourself the task and to reduce plant stress.

For the rest of those listed plants, especially other conifers (needled evergreens), pay close attention to expected mature size on the plant tag and make sure you have room, taking into account overhead utility lines. Take that stated size with a grain of salt too, since older plants keep growing and will not plateau at a set height forever.

Yew, Japanese plum yew, boxwood, and holly will handle a fair amount of shade and still look good, though the less sun they get, the less dense they might stay (or growth will slow). None of these species are super fast-growing (otherwise they’d get much too large for the space), but boxwoods and the upright yew varieties are among the slowest in pace. Even so, planting small, young specimens will be easier on both you and the plants (especially if shade tree roots are infiltrating the area), and they will catch up.

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.

Have a plant or insect question? The University of Maryland Extension has answers! Send your questions and photos to Ask ExtensionOur horticulturists are available to answer your questions online, year-round.

The value of a pile of sticks in your yard or garden

With spring coming up, many of us are already starting to get our yards and gardens ready for the growing season. Among the activities we may take on, there can be the managing of branches, sticks, and wood that may have been trimmed from trees and shrubs in the fall, over the winter, or just recently. In today’s post, I want to talk about how to integrate these resources into our green spaces, to support wildlife and the natural services they provide.

a pile of stick in a yard
Wood and stick piles can provide welcoming habitat to beneficial organisms. Photo: A. Espíndola

Increasing the diversity of our green spaces

In several of the posts that we publish on this blog, we recommend different actions that can be taken to increase biodiversity in our green spaces (see local ecotype plants, helping pollinators in small green spaces, and conserving parasitoids for some ideas). We know that increasing biodiversity improves the ability to control and restrain pests, increases wild and crop plant pollination, and in many cases leads to better soil quality. Among these practices, there is one that increases the physical complexity of our green spaces, providing nesting, shelter, and food resources to beneficial organisms. The practice I’m talking about consists of building wood and stick piles that can be established in our green spaces. The idea behind this practice is to create a space where birds, small mammals, insects, and even pest predators can find their preferred resources, and thus be attracted and present in our environments (learn more about the landscaping rationale for using dead wood).

What organisms are attracted by these piles?

Depending on the size of the pile and its composition (e.g., large logs, smaller sticks, a mix of them), different organisms will be attracted and may establish themselves in our green spaces. The presence of a mix of logs and sticks usually attracts birds, which may nest within the pile or may just spend time within the pile searching for food or finding shelter at different points during the day. These birds will certainly contribute to increasing the diversity of animals present in our green spaces and can also in some cases participate in the control of insect pests that we may not want in our gardens and yards.

Carolina wren bird with a caterpillar in its mouth
Carolina wrens are very attracted to shrubby habitats, meaning that piles of wood and brush represent a great way to provide resources to these little cute birds who in turn can help us keep herbivore populations in line. Photo: Shenandoah NP.

Other animals we can observe in these piles are a variety of insects then may be associated with the decomposition of wood or that may use wood as a nesting or overwintering resource (e.g., bees, solitary wasps). While the former can help recycle the wood material and reintegrate it into the habitat, the latter may participate in the pollination of plants and crops that we may grow in that area or predate on unwanted pests.

Similarly, ground-dwelling invertebrates like millipedes and ground beetles can also find shelter under these piles, while the brush can also contribute to the nesting of pollinators such as (ground-nesting) bees, the overwintering of some butterflies and moths, and help improve the quality of the soil in that part of our yard.

Larger organisms may also be attracted to these piles, such as small mammals, amphibians, and even reptiles. Although we may tend to dislike these groups of animals, many of them feed on unwanted soil organisms and may help with soil quality, while others can actually control vermin through their predatory abilities. This is particularly the case of snakes that may find shelter in these spaces, which, while harmless to humans (the vast majority of snakes in Maryland are non-venomous, readily feed on rats and mice that may be present around the house.

a pile of wood branches and sticks in a yard makes a habitat for beneficial organisms
A mix of thick and thin pieces of wood can provide a diverse habitat to many different organisms. Photo: A. Espíndola.

How to build these piles?

These piles can take many different shapes and sizes, which depend in part on the materials and space available. When very large spaces are available (e.g., in the woods), it is recommended for these piles to be relatively large – at least 10 to 20 feet in length, and up to 8 feet in height (read more about these larger brush piles). In smaller spaces such as in urban or suburban gardens, these piles can be much smaller, occupying areas that may not be regularly used for other purposes. In all cases, it is ideal to build these piles using a combination of different types of materials, such as twigs and branches of different thicknesses, some logs, and even some branches that may still have dead leaves attached to them…always using healthy materials.

An important consideration when putting together these piles is that they should not be built leaning on or very close to wood-based structures or the foundations of our buildings. This is because of the potential risk of termite infestations of buildings if the piles are not physically separated from them. However, it is important to stress that establishing these piles has not been shown to be associated with higher termite infestations if the pile is not in contact or very close to the built structure. (You can read a very good discussion about mulch and termites from Iowa State Extension).

So, as you work on your spring garden, I encourage you to think about plant stems, logs, and branches not as waste that needs to be cleaned up, but as beneficial resources that you can incorporate into your available space.

By Anahí Espíndola, Assistant 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!

How to soil test and actually utilize the results – a challenging task

As a newer gardener, I have not previously gotten around to using soil test information. I’ve been planning an ornamental overhaul in a small area of my yard and wanted to soil test to make sure the plants added to the area had the best chance of success. The HGIC website has a lot of soil test information, but I’ve never looked at it closely myself until now. Even though our content is well-written and organized, the subject is intimidating with many choices to make, multiple steps, math homework to figure out how much fertilizer to use in your space, and as I learned, many caveats or roadblocks. I can see plenty of people just giving up and not adding any soil amendments, or just going to the hardware store and buying a bag of fertilizer and applying without thinking too much about it.

Even after reading our material thoroughly, I still needed several questions answered from our experts. I’ve got a handle on it now, for the most part. With this post, I hope to detail how I figured out what fertilizers I needed, how to apply it, and then the most important things I learned that I didn’t feel are made clear.

The goal

I’ve got this space in my backyard that wasn’t being used for much. In the summer of 2020, mid-pandemic, pre-offspring, I decided to revisit a teenage hobby of mine – remote control cars. I took a shovel and cleared out an area and built ramps and hills out of dirt, for my very-own mini-dirt track. 2 years later, my wife asks me “are you going to keep the track? It’s ugly.” So, my task is to beautify it with improved landscaping and added vegetation. We also have a bunch of hostas in our front yard garden that keep getting eaten by deer. Our backyard is smaller and enclosed, so we hope the hostas will avoid attack in their new backyard, trackside location. We are also adding other plants good for shade conditions.

The location is on a bit of an incline, with the higher elevation area being more sandy and rocky, and the bottom softer and wetter. There is an “infield” of the track that is often stood on that is grass, but has been overtaken with weeds. I am planting nice plants and shrubs around the outside, and re-seeding the infield with grass. Since I know from a lot of digging to make the track that the soil is quite different in different areas, I wanted to soil test so that I could find out what exactly I might need to do to make sure the plants have the soil they need in their different locations.

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