Tomato Patch: Do Plant Protectors Work?

Wall O’ Water and Better Boy tomato plant

You’ve seen the ads in gardening magazines, seed catalogs, and online—ads for plant protectors called Wall O’ Water, which claim they can speed up tomato growth and fruiting by several weeks.

I’ve read those ads for years: Fill the protector with water. Sun warms water which warms soil. Add small plant 6 to 8 weeks earlier that you normally would. Harvest longer. Easy to use. Reusable, three to five years. Great for tomato, squash, pepper, pea, and other veggie plants down to 16° F.

Actually I have two three-packs of Wall O’ Water protectors in our garage—packages I’ve bought over the years but never used. Why? I don’t really know. I actually took them off the shelf and planned to use them this year—but didn’t.

When I was walking through Westside Community Gardens of Columbia Gardeners, Inc., I saw a gardener planting tomatoes. Behind him were taller tomato plants growing in Walls O’ Water.

“Do they work?” I asked Stan Purwin, who’s gardened at Westside for eight of his 35 gardening years.

Stan Purwin and his two Better Boy
tomato plants

“Yes,” he replied, inviting me into his fenced plot of raised beds. “I have two Better Boy tomato plants that I planted side by side on May 9. They were the same size. I put a Wall O’ Water around one and not the other. After less than three weeks, the one with Wall O’ Water is several inches taller now than the unprotected one.”

Sure enough, the two Better Boys, side by side, were different heights. I wrapped some yellow marking tape around their cages to mark the top leaves in each. Stan measured them. The one in the Wall O’ Water was eight inches taller.

“I notice your Walls O’ Water don’t have any water in them,” I said.

“The water wasn’t turned on yet here at Westside Garden Plots when I transplanted in early May, and actually the Walls O’ Water aren’t easy to fill with water, so I just circle the plants with the empty protectors. If I filled the protectors with water, I’m sure my plants would be even taller, by another inch or two.”

Walls O’ Water—maybe in this case we should call them Walls O’ Waterless—work for Stan’s tomatoes. I’m convinced that they work too, now that I’ve seen his Better Boys side by side.

Stan said he buys some of his tomato plants and starts some from seed too. This year, in addition to Better Boy, he’s raising these varieties: Pruden’s Purple, Big Mama, Green Zebra, Early Girl, Box Car Willie, Brandywine, San Marzano, Porterhouse, Sweet 100, Whopper, Sugary, Defiant, Wickline, Roma, Aunt Ruby Green, Juliet, Mountain Magic, Celebrity, Big Beef, Rutgers, Aunt Ginny Red Beefsteak, Red Plum, Sugary, Valencia, Sungold, and Virginia Sweets.

Whoa, 27 varieties?

“Yes,” Stan affirmed, “about 54 plants.”

I must have just stumbled into Tomato Heaven—or maybe Tomato Haven.

Why so many?

“I tend to get carried away, and I usually try to plant at least two of each variety in case one fails.”

What does Stan do with all the fruit?

“We eat some. I give some to neighbors and friends and other gardeners here at Westside if their plants haven’t been successful. I give the rest to Grassroots, a nearby local crisis intervention center for individuals and families.”

Will Stan’s Green Zebra tomatoes
be ripe on July 4?

“I’ll be picking tomatoes by the Fourth of July,” Stan said. “Come back on the Fourth, and you’ll see.”

I’ll be picking my first tomatoes two or three weeks after that. Really, next spring I must start some of my tomatoes a month earlier than I usually do and set them out in late April or early May in Walls O’ Water.

And I’ve got to get back to Westside around the Fourth to see what Stan’s picking—real-life tomatoes, many of which I’ve only salivated over as I looked at their photos in seed catalogs.

5 Comments on “Tomato Patch: Do Plant Protectors Work?

  1. A reasonable gardener might conclude that a piece of plastic wrapped around the young tomato plant and its cage might be just as effective–and a bit less expensive. Cool!


  2. I haven't seen any evidence that wall-o-water plant protectors speed up the ripening process. They do seem to give the plants a good head start when the weather is cool. I fill mine and the protected plants usually grow healthy in the spring, while the unprotected plants don't grow at all. This tends to make for more fruit because the plant is bigger and stronger. But they all tend to ripen at the same time. That's been my experience.


  3. I agree, Bill, that protectors are great at protecting, but I too think the great mass of tomatoes still ripen about the same time. Perhaps the protectors get a small, ripe tomato a week or two early, but the bucketfuls still come in August.


  4. Bob, regarding your 6/1/11 comment: don’t think so. It is not the plastic, it is insulation provided by water or warm air mass created by the plastic that protects the plant. You could wrap a plant with many boxes of saran wrap without achieving benefit.


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