I have yet to see a closed envionment that can hold a 15 foot tree

Plants shown was harvested in early April. We call her a 90 day wonder. You can grow outside and get 3 harvests a year here. Legaly, I only get 7 plants in the dirt at one time.

If I could have unlimited # of plants I would do what you suggest. Instead I grow for yield. And, I would happily put my best up against yours anytime. In a friendly stoney competition (nothing personal, you know I had to say that).