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Wait until your soil is a little dry on top. F soil is to wet, the D. E will absorb and turn to a silaca and won't work for insects. If using to aide with healthy root system, my impression is to sprinkle on top of soil, water as usual. I mix it around a bit with my fingers so it isn't just sitting on top of soil, when not using for insects. I haven't had to use on cannabis for insects, fingers crossed, but me tomato's I have and it works. Messy though. Make sure it is FOOD GRADE, very important.