"Sunsprite" although billed as winter hardy, simply is not in 6a-b Canada. The "Tree Rose" type would suffer even more. They have to be brought inside, basement, garage. PS. I have an unheated greenhouse, and for the last two years, I have taken show HT. roses on our deck in camo 5 gallon pots, to an unheated greenhouse. Top up with soil, water, and have not lost one yet! In Spring, I bring them back to the deck again. Garage or basement should work just as well, but don't let them totally dry out.