Mothers

I've got 3 beautiful WW moms that have performed great! I have taken almost 50 clones from them and over the course of this year have harvested some GREAT bud. They are vegging under a bank of T5s and have outgrown the space I have for them. I REALLY want to flower them but the fact that they will triple is size means I don't have space for 3 twelve foot monsters in my basement hydro setup.
What suggestion do you have to flower these. Should I flower them one at a time? What kind of tying and training can be done? Would these survive a transfer to the outdoors to continue growing and flowering this fall. The fact that they are hydro probably means that can't go outdoors?
I'm open to any ideas you might have,,,,,,,
THANKS

when my mothers get to tall i retire them. Every time i have flowered a mother that has had several cuttings the overall result is less than desireable.

yeah or you can LST the plant just pull the top down and tie it down