I use 50% white sunshade cloth on tomatoes. When you walk under it in the sun, it is like going from sun to shade in terms of how it feels temperature wise on your body. I figure the plants have a similar heat relief. I believe I get a couple of extra weeks of fruit set and healthier plants throughout, so it is well worth it to me. I haven't done it for peppers because my peppers are shaded in from 3 p.m. on and get heat relief that way.
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