My husband built this frame work to hold three tomato plants. The grass in the top of the buckets helps hold the moisture in. He cuts it with a scissors. The chains on each side allows him to raise the buckets as needed.
Simply popping the lids on the buckets will also stop evaporation and keep moisture in. I plant another tomato or a green pepper plant on the top of mine -- doesn't stop the evaporation process, but gives me extra food in otherwise unused space. This year, I have cantaloupes growing under my buckets, so in effect, I am gardening on three levels. By-the-way, the buckets do not have to be filled with dirt. You can add more as the plant roots fill the container. It is extremely important to thoroughly water the plants before they dry out, or at least every other day, and to fertilize them too.
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I am looking for instructions on how to build a frame to grown tomatoes upside down, including how to secure it. Maybe in a hole with cement to the ground so that it can hold the weight of the buckets.
Tips for growing tomatoes in hanging baskets from the ThriftyFun community. As far as hanging baskets of tomatoes, all I can think of is grape tomatoes would be the easiest and most adaptable.