I'm not so sure about any true benefit of freezing soil for insect control. Maybe it would kill most of the transitory egg population (ie:bugs that only are in your area in warmer weather) but it's cold up here in the N. Rockies and our native bug larva/egg laugh at -50 F.
I've always read that cooking the soil is the way to ensure sterility . . . long time, low temp, like 2 hrs @ 200?
At least that was the prevailing opinion 40 years . . . and also, it can stink.
Have beautiful healthy colas a plenty buddin' up in MG MoistureControl today.
I've been using MG for regular gardening since Jesus roamed the earth, and I can tell you, his feet WERE dirty.
Latest batch I TP'ed into larger pots w/fresh MGMC soil on Day 1 of 12/12. Works well, especially clone-to-bud w/o veg. Wider pots make wider buds, it's looking like here. Makes sense?
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