Personally I don't see one.....i mean i grow 4 full sun garden plants each season from various breeders and I force them to grow my way(which is actually often adverse conditions like frost, heavy wind, hail, hell I almost got hit by a friggin tornado last summer...gasp!!) and it doesn't matter what the strain is.....they grow like monsters. I honestly can say that if i tried to emulate breeders tactics, my plants would be smaller. I think its safe for me to say this, because the plants I grow are monstrous every season. The same certainly can't be said if you check out breeders plants!!