As to trimming...there is no need at this point. If she doesn't need the leaves anymore they will drop by themselves. Just remove the dead leaves afterwards and you should be good.
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Also, how long should i wait before starting flowering? I think I'm probably going to keep it in the smaller box for this grow, which means I can accomodate for another maybe 4-5 inches of vert growth.
A plant once introduced to flower will typically triple in size.
Cool...thanks. Good to know.
Separate from the issue of salt build up from fertilizers, I read somewhere that plants generate "waste products" that can build up in the soil and cause problems. This is particularly true if there is not enough run off during watering, and for this reason it is not an issue in greenhouse or outdoor growing, but indoors it can be a problem. Is this true?