From what I have read and was told from a very experienced grower it seems they should root by themselves as long as their very moist and warm.

Just what I heard bro, wish I had more info, but I personally haven't grown clones. Been growing in ebb & flow for one year.
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There are no confirmed, published deaths from cannabis-only poisoning. There are a small number of people who report serious cannabis allergies which cause unexpectedly intense reactions, throat & lung irritation, etc.
Marijuana, in its natural form, is one of the safest therapeutically active substances known to man.
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