Quote Originally Posted by eggrole1
You will end up having to transplant them sooner or later since they will get root bound in that container. As others have said move them into separate pots (just use some cutoff gallon milk jugs or something) or not only will they be root bound, but the roots very tangled making it more difficult to transplant later.
Chances are they will not become rootbound. you can flower in a 1 liter bottle at 18inches and still not get bound. The majority of people that think you will actually be bound before its too late are growers that have either started in 3-5 gallons or just growers that have never tried what we call a "micro grow"