i started off with a few clones that were already rooted when i got them 4 weeks ago. I'm using soil and a bunch of CFLs. I stayed away from nutes based on the advice of a friend until a couple days ago. i am using some 8-7-6 miracle grow. i got the clones from a friend that grows so i assume they are pretty good genetics. the plants look very healthy (aside from a light burn or two) and they are approx. 18" tall. they're still on 24/0 and I was wondering how i can tell when they are mature enough or big enough to start blooming. they have been preflowering for about 2 weeks now i'd guess. Also, as an aside, when is the best time to clone these beauties?