When should I 12/12???

Hi everyone, these are my plants they are going on there 7th week and i need to know are they are ready to be moved into the flowering stage. This is my frist grow so not sure if the size should be bigger or what. They're under a 600w light 18 hours and keep at 75 degrees, but the humidity is high due to where i live. Also the strains are different because i wanted to know which would do the best. Any comments would be great, thanks.

Some look ready, some I'd wait a few more weeks. I'd say by 10 weeks you should be good to go 12/12

They all look ready to go into flower to me... Depends on your space and how big you want them to get... I'm going to flower mine when they reach 7 inches which will be soon when they are around 4-5 weeks old.. Really they are ready to if you want them to.

Whenever they are a size you like them. They will grow more during flower, but some people even flower at 1ft.

normally, the plants double in size from the time you flower (flip to 12/12) to when they finish.. so flower when they are half the size you want them to end up being.. some even get bigger.. so just make sure you flower early enough to give yourself room..

go for it!! just don't expect much in the way of weight

how big is the flower room? if it is that room I would do it now or your not gonna have room to move in there after they fill out.

If you have the room to grow them bigger you can keep vegging but if you have space limitations then you should start flowering. Those are gonna be some pretty big plants already. Its your choice whether to start flowering or not