In this intense heat wave we are experiencing, (100 degrees F+) I have saved my garden produce from sunburn and kept the plants green by covering them with old bedsheets, tablecloths, etc. (or anything else that is lightweight)
The tomatoes especially have done well. I am picking some of the prettiest tomatoes of the season. We are having a few clouds today with a 20% chance of rain, so I removed the sheets for the first time in almost two weeks, but will replace them if the high temps continue. Water daily, but don't use the overhead sprinklers, just drench the base of the plants with water from the hose.
I am new to vegetable gardening and am doing the Square Foot Garden. I am wondering if you put the bedsheets directly on the plants, or suspended the sheets above the plants. Does direct sun penetrate the sheets enough that they get their required sunshine?
By the way, I water every morning and try really hard to keep the water off the foliage. Most of my vegetables are doing really well. Today I snipped some turnip green leaves and chewed them right in the garden.
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