Do not go by a fixed number of weeks for flowering. The amber trichomes are the indicator for ripeness. The times given by the seed companies are not a given figure since every growing system is a little bit different and environmental conditions are not the same in every grow.

The only true sign of ripeness is the milky trichomes turning to amber. You must use a good magnifying glass, or a good loupe, or one of the usb scopes for the computer to view the trichomes to determine ripeness. There is not one given figure for flowering times as every species is different. Early harvest will result in much lost yield and reduced thc content.

Good sizes for production are 4", 6" (1 gal), and 3-5 gal for finishing. I start seeds in jiffy 7 peat pellets then transplant to a 4 1/2" or 1 gal pot when roots show on outside of peat pellet. When that pot is filled with roots on the side and bottom transplant to a 3 or 5 gal pot.

Generally speaking the larger the pot the bigger the root system gets, resulting in larger top growth and bigger plants. The longer grows also result in higher potency plants. Sometimes I use the root ball from the spring harvest, return to 18 hours photo-period to change the remaining branches on the lower part or the plant to pre-flowering stage, then plant outdoors for a nice really potent fall harvest outside



PS: clean pipes are happy pipes and happy users