Hashyanswered grow question 9 months ago Your plants will stretch when in flower, they could stretch to double or more in height when flowering. So that should dictate when you need to induce flowering. If your veg plants are 40cm tall when you switch to flower they could grow to 80cm plus when flowering, make sure you flip to flower when your plant hits a height you can cope with after the stretch. To get them into flower is easy, change light schedule to 12/12, and leave it like that for remainder of the grow.