Flowering in one gallon pots

Anyone flower in a one gallon pot? Think I'll be alright? Pcg cookies, bubba diagonal, and dosidos.
Feeding them house and garden with a little roots organics terp tea. They're about a month from when I picked them up, haven't flipped yet. Thinking one more week. Was contemplating transplanting into maybe a 3 gal but I'm thinking if I just make sure they don't get thirsty/over water it won't make too much of a difference. They're under a 1000w hps turned down to 60 percent, plus those little sunblaze

That completely depends on the medium. If that's a hydroponic medium like pro mix or a coco/peat blend you might be able to get away with it depending on the size of the plants. I'd still never flower in 1 gal unless I was running SOG. Even in coco I flower in 3 gal pots. If I'm growing in organic soil I flower in 5 to 10 gallon pots.

Its roots organic potting soil. I'll probably transplant then flip.

There are some funny pics online of massive plants growing in 1 gal of coco, but don't do it with soil, you put in so much time and effort it's not worth massively bottlenecking your yield.