Guerilla grow, girls are out in the forest. Its shitty out today and suppose to hit -2 tonight. Girls are almost a foot tall. How do you think they will hold up??
Probably depends on how long they have been outside to toughen up and how bushy they are. A bushy plant will insulate itself better than a tall lanky plant can.
Freezing water expands, and destroys cells in plants. In other words. Freezing a growing pot plant results in mutations that can kill the plant. Not good to let them freeze even in veg.
Yeah, they can take a light frost or two, in fact it will help them prepare for the frosts come this fall by increasing solute levels, anthocyanins and lignin especialy.