im just a lil confused about what you mean by growing leaves in sets of three.. by this, do you mean that they have three fingers to each leaf, or rather do you mean that off of the main stem, your getting three branches instead of only the normal two?? i'm pretty sure you're talking about the later, but just wanted to make sure first..
if you're talking about the latter, it is not too uncommon of a thing, and is called a triploid, or a polyploid, and that just means that there are more than the normal two branches ... i've heard that some polyploids can be stronger in the potency dpt, and can yield better as well, but nothing concrete to really back that claim up though..