I would prefer to hung the old Christmas trees bulbs around the tree instead.
Its more economical and practical (than clothes dryer), but this is only my opinion...
If the winter night is more severe (like in low 30's), I encircled the trees with cardboard
boxes fashioned as a wall. I did this last Winter, not one tree died, except one tree
(Jackfruit) the following Spring but that was due to sunburn...