150 pounds huh?
And you want them that close together? In a greenhouse? Sure hope you:
1.) Live in an absolutely legal state, or only thing youll be getting is 150 years.
2.) Have a massive dehumidifier coupled with a masive air conditioner. Or you'll get 150 pounds of mold
3.) Like spider mites and fungus gnats. Both of which THRIVE in those conditions.
4.) Have an underground bunker to protect yourself incase one of the large gangs gets an idea about your place.
5.) Have an army of loyal robots