topping

Depends upon the strain but definately once, before you hit the screen.
Anything after that is strain dependant.
 
I would consider fiming before topping - the worst that can happen with fiming is you only get two growing shoots, which would happen if you simply topped it, so go for the fim :D
 
Greenhouses big bang. Is it fem? Check out my U-scrog grow a while back. pulled 5-6 oz off a single plant first go, 250w. I topped and then fimmed. If I did it again though, I would just just top once. Bear in mind I had a badass 6" fan for a minimal 250. Any less and I'm sure I would have got mould. My second grow, I only just pulled it off without mould getting too bad.
 
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