At least 2 weeks Or when your plants are 4-6" tall. As far as your nutes, stay away from slow-release fertilizers, they take too long to break down and can't be flushed prior to harvest. Also i recommend that you buy some Earth Juice or any other organic nutrients. Chemical nutes and pesticides should not be used to grow cannabis.
I also recommend buying a 250 watt High Pressure Sodium or a Metal Halide. That would really boost the quantity and quality of your herb.
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