Here’s another suggestion, cheap and versatile :
I bought strong galvanized wire, cut lengths and bent them into half circles to make tunnels 10’’ high and 15’’wide plus 7’’ on each end to be buried into the ground. They are big enough for one row of lettuce. For several rows or bigger plants the size is different : 2 feet high and 3 feet wide. I tie their tops together with a string to keep them vertical. I buy plastic wide enough to cover the wires plus 8’’ on each side that I load with bamboos, sticks etc. kept in place with stones. I never care about overheating under a strong sun, I’ve never had any bad surprises !
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