don't put them into a flowering cycle until they have reached at least 4-5 sets of branches ... but, yes, you can put them into flower directly from seed, if you wanted to :wtf: ... IF you want to risk jail, and burn electricity for months, just to have a one-joint yield, that is ... takes big plants to make big buds, basically ... in general, I 'Veg' for 7-8 weeks, and 'flower' for about 8 weeks, depending on the strain (I currently have a Willie Nelson in it's 11th week of flowering, and not close to finishing, yet) ... makes no difference if you are growing tomatoes, or cannabis ... GROWING REQUIRES PATIENCE