Hello I live in Toronto Ontario and currently have a few fig trees (Black Mission, Hardy Chicago, LSU purple, Stella, White Genoa) they are all in pots and have been brought into an attached garage for the winter. However, the garage is not insulated and not heated, thus I planned on wrapping the pot and tree first in burlap and then with really thick insulation(the natural one if it makes any difference). I was wondering if this would be sufficient enough for the trees to survive the cold winter? If it is not any suggestion would be greatly appreciated?
Thank You for all responses

It would be helpful to know what the average temp of this garage is during the deep of winter.

The garage is huge and would be virtually impossible to insulate because of its largenes. Secondly the basement idea would not work as it remains very warm (room temp) in the basement and would for sure cause the tree to break dormancy. Thank You for your suggestions, anymore would be greatly appreciated?!

Here's an idea off the top of my head.

Thank You very much for your replies. I may try the box idea. If anyone has anyother suggestions, let me know
Thanks

I also live in T.O
You could pick a corner in the garage ( preferably at least 1of the 2 walls being an interior wall ) and get 2 inch foam boards from home depot ( 4x8 ) and one on top making an insulated room . Then if needed hang a light bulb in there for heat .

John