should i start to flower?

should i start to flower these babies yet, 4 of them are between 19 and 23 inches, the other 6 are about a foot. and i know they will keep growing after i start to flower, but how much ?

double or treble, depends if sativa or indica, guess sativa could get pretty tall. your call.

depends how much room u ve got... if u keep them longer for vegging u will get more buds at the end.
It is up to u

That depends on how much vertical space you have. In the first 2-3 weeks of flowering they will stretch quite a bit, then they will return to an average growth rate as they flower. if you've got the space you can let them veg a longer. If you want to get them going for some bud then that's cool as well.

ya im gonna start i only have a max of 4 1/2 feet and a couple are already over 2f so if they double like most people say ill be good!