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Old March 7, 2021   #5
ddsack
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Join Date: Jan 2006
Location: Northern Minnesota - zone 3
Posts: 3,218
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I am thinking of making a disc of plastic, with a hole in the centre and a slit halfway through. I can also use multil-layer discs of 100% shade cloth to breath.
A solid plastic disc certainly should stop evaporation from the top of the soil, giving you a bit of leeway in watering chores. However, as the plants grow larger and roots fill the container, they will still need a lot of water in hot weather. I'd give it a try and see how much difference it makes. I do a similar thing with houseplants when I need to be gone for a month. I fit smashed together plastic grocery bags on top of the soil, and in a cool house, they stay very damp for weeks. Obviously, a large tomato plant in active growth in hot conditions would be different in it's requirements, but it's worth a try for comparison.
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