Cindi ...
I think Andi,
@GardenQuilts, over winters plants near a wall. Maybe she can give you some input.
Otherwise, the heated garage is fine, but I would place the roses away from the window.
Smiles,
Lyn
Edited to add: In San Diego, night temps at 40F are considered cold. Generally, they are warmer. The roses come though just fine, so do think the heated garage would not cause a problem.
