Quote Originally Posted by curious101
...is this safe...
Hmm... define safe...
Will the plants burst into flame? No.

They will, tho, take a really long time to revert to vegetative growth- like a month. Then you're going to veg them for a while, then flower them again. I think you'll probabley get the best yeild over time ratio if you let them finish and then get new plants in there.
Also, the extended stress period will take it's toll- you could end up losing some or all of the plants anyway. I've only found re-veg to be useful when I discovered a mom w/ real potential that, for whatever reason, I hadn't any cuttings from before I started flowering. It's a Hail Mary play- only worth it when there's nothing to lose.

If they're only a few days into flower, kick em back into veg, take cuttings and LABEL them, then flower the moms. When the boys show, kill em and dump the cuts from those plants. Now you can move the cuts into flower ( having held back at least one for a mom) and re-fill the space. You'll harvest twice, a couple weeks apart.

About the time you harvest the original plants, you'll wanna take cuts from yer set-aside mom. These are all known girls, so you can root them, veg til you feel good about it, and flower. No worries. No hermies. No hassle.