By the traditional planting time it is mostly the bleaching effect of sunlight.
If you are trying to plant early,ground temps are more of a factor than wind/air temps.
The traditional planting time in the ground here is memorial day weekend,but I cheat
and use 2 hole cement blocks stacked in a row.Warmed by an armored garden hose
snaked thru the holes pumping warm rain water 12v pump.June 17 I picked the 1st
red tomatoes.I missed last years record by 2 days.
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