Ok ive done as much of temperature studying as i could, at 60F most plants (minus maybe the fact there are plants (including cannabis) that grow on the himilayias) slow all metabolic proccesses. Most plant organisms have a very similar situation. Once an outdoor plant gets to freezing this can become irreversible. Cannabis plants can take a 50F-90F range. The issue that is important to remember is how much variance occurs. If the plant is used to a 60-70 degree environment than the cold shock is lower than a plant that typically is in a 75- 85F environment. The issue that can become a problem, is the people that grow in a dessert; because the range is very significant. Me being in a subtropical zone (which is why I thought they asked where you live). I have read and seen that when these plants become cold what they exhibit, as what similarly humans do, in the similar situation. In cannabis the reports say the plant turns purple; what happens in humans is the cells turn black. The cells turns black in humans is because the freezing of the cell, parts of the cell become frozen and then they rupture the mitochondria, thus spilling the contents and turning the cell black. (This is my assumption why cannabis turns purple) Plant cells are forced to be in this situation more often than a non-plant organism typically will. Plant cells have a stronger cellular wall that resists the ice crystals from rupturing the cell wall, but in some amount the cold does in fact rupture the mitochondria turning the cell purple (black).
Disclaimer, These are based on my knowledge of biology and in no way shape or form do i feel i am 100% right. This was just a conclusion that I came too.
I also invite criticism I am applying a theory and I have not cited years of sources (as i would in a normal thesis)
