Michigan fall season extender; I might try a fixed white, insulated E_W wall, with half a hoop house extending to create your protection. How tall or perhaps a more cold frame size depending on the height of your MMJ strain.
If you need more extension, first use insulating blankets of some kind over the film and rent a ditch witch type trencher and put some EPS or other foam board around the grow area; the cold surface earth will suck the heat out of your protected growing space. This is a lot more important for a small hoop house. Wet ground is a good thermal conductor and poof, there goes your warmed soil withing a few feet of the border.
I'm a legal medical mmj user myself, for MS pain and epilepsy. I use the high CBD/low THC stuff, very hard to find in AZ. My liver and gallbladder were wrecked by 20 years of conventional anticonvulants, and I can't handle them anymore, so it's been a lifesaver. It's well tolerated and my low dose is well below a high, which just makes me paranoid. Ticks me off that the rules for growing what I need are so outrageous, even though I'm out in the middle of nowhere. 10 foot walls or a secure locked facility, and annual fees and documentation that are downright abusive.
