It wouldn't be worth buying seeds this late in the season. Just get some bagseed and plant them you will get a small yeild but thats better than nothing + some experience<-priceless. As for next year you should go ahead and start considering what strain you want to grow and maby order them so you know they will be ready for spring. Outdoors in FL you will not have any limitation on what you can grow because it will be warm in November. Just get an easy strain to grow since its your first time and think about what you want as far as taste, yeild, bag appeal, and potency.
