depending on the amount of light and health of the plant... if u are not going to top or anything like that... u can throw into flowing as soon as 2 weeks (if u want to keep the plant small)... from a novice point of view, it seems to be that the size of the stem is a good relation to the size of the yeild... thin flimsy stem equals weak yield.. immovable tree trunk like stem = good yield..... IMNO (in my novice opinion)