You can grow 6 plants, of which only 3 can be flowering.... so this would by default only allow you to legally grow 3 plants outdoors I'm assuming since you can't control flower time.

I think you'd get some kill results up in the mountains with the light intensity up there. In fact, I've heard there's some areas up in the mountains where they grow giant watermelons, tomatos, etc... with almost abnormal results.