There are some methods you can use to speed up flowering times on pure sativas, hazes, etc. I'm trying it this run with hybrids (I think this will work with any strain except autos) but have a good friend who has had great success the last couple runs of Pure Colombian, Highland Thai, and Neville's Haze using a modified version of 12:1 (research Joe Pietri) that I came up with from doing some reading and philosophizing during heavy smoke sessions. You can cut a few weeks off and keep the plants shorter by playing with the light/dark cycle a little and actually ADDING to the total number of hours a plant gets light when you switch it into flower ... not really the total hours. I should have said the total amount of light intensity per day (will clarify later- it's 3am here LOL).... It defies the "traditional" cannabis method (18/6 cut back to 12/12) but boy does it work! I've seen it with my own eyes. My 6 month-old is crawling all over me right now but I'll try to elaborate a bit later or just start a thread on it when I get some time.