I have been using them since the old days when they were clear. I have tried using them the first part of April but the plants did not put on growth that early. So found it work best to wait until end of April. My average last frost is supossed to be May 15th but have gotten frost as late as June 10th. You can always throw a frost blanket over the top if there is a late frost. I use a piece of rebar inside the WOW's to keep them from collapsing. I remove them mid June, but be prepared to catch the tall plant and put a cage over it or some type of support. The plants are not able to stand by themselves if they are tall. The bounce back in a few days. I put a cattle panel down the middle of my 16 ft long raised beds and plant on both sides.
Barb
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