size 2 start buding

any advice plz on how tall me plants should be be for budding from seed myn are 8" tall and are takeing about mounth and a half 2 grow and want it 2 budd should i go on or wait till wot size anyone plz helpjoint:

Wait till they are at least 1 & 1/2 - 2 feet. They plant will not be able to hold the buds it will produces.

As long as you have atleast 5 nodes or 5 sets of leaves you can flower at any time. The longer the wait the bigger the plant and the bigger the buds