This has been an interesting thread for me. I've always started my seeds in the 9 oz. size Solo cups and have never had a helmet head. I had plenty of seeds left from my Mule Teams so I tried a little experiment. I planted 6 cups of 3 seeds each in the little 2 oz. cups, 3/4 full and placed them on a heat mat. I got 18 helmet head plants. I don't know what it proves but I know I'll stick to my bigger cups from now on.
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