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I want to move to Palm Springs, CA, USA, and dig 6X6X9 foot deep pits and put in 3 feet of rocks and then 6 feet of rock wool. I will test different feminized Haze strains. Any particular problems with outdoor hydro? Is 3 feet of rocks enough drainage?
I tried it once and didn't get good results. Although technically it was a greenhouse. Water evaporated to quickly and the water temp got really warm. But this was in the summer time in southern California.