There are any number of ways to get your cool season crops for your fall garden started despite the intense heat of August. In fact some of them will be just fine direct seeded into the garden as long as you keep them well watered. However, you will still have to contend with peak populations of insects.
This simple trick will protect your tender seedlings from the intense sun, while still letting in plenty of light, and keeping out the bugs.
You can weight down the edges of the screen cloth with boards or you can fold it under the flats. You can also water right through the screen cloth. You can even use this trick if you’ve direct seeded. By the time your plants outgrow the inverted flats they will be big enough to survive the sun without the protection.
Try to pick an overcast day to remove the screen on if possible – otherwise do it in the afternoon when the sun has passed it’s highest intensity. Remove the mesh tray a day or two later.