When to go from veg to flower? (and defoliate side question)

Thank you very much for the answers, i took them all in consinderation. Good informative video by "the kyle kushman" I'm all for an answer with a source+education :)

I switch mine when they are 20-30cm tall (usually at he end of week 3) and they reach 60cm 1m25 depending strains and phenotypes. whatever you do with defoliation keep it lite.

Hey 1337soon, When looking at your diary, they are close to 30cm. Your seed supplier promises a height of 60 to 100cm. Plant like to stretch their size and even some sativas go higher then that. You can eigher put her now into flowering or wait another week to give her a little stretch. but since you want to defoliate them, you should do that now and give them a week rest so they won't stres and can stretch a little bit. So your plan is a good one :) Just remove some leafs that are not getting any sunlight and start with that. You can defoliate again when she is in like flowering week 2. Even after that you can, but not in the last weeks. Goodluck :)