no worries you have lots of options. check out the company your going to order from choose plants that say mid september chances are they will take till the end of sept anyhow. start them indoors abot 2 months before putting them out and this will give them a big headstart. use some t-8 or t-5 floros and get the tops real close to the lights.unless you can afford a metal halide. as for recomendations i always hate recomending things but lui from legends is great i can pull them by mid sept. mendocino madness from th seeds will finish early and is wonderfull. ive grown mighty mite crosses and have been happy with them. mighty mite x super skunk i planted years ago when i was young and didnt know much they were done mid sept with 1lb+ on each. i must pull mine around the same time and ive got some himalaya gold from green house,mandala #1 from mandala, some biddy early from worlock, my lui clones and whatever a couple good friends come up with. they say they have some surprises for me,we exchange clones. and im trying some autos this year i havent got much hopes for quality but people say otherwise so im doing some. and man they are expensive. youve got lots of choices do a little homework you will harvest nice. good luck.