Why 'Constance Spry' Won't Bloom in Montreal

'Constance Spry' blooms once annually on second-year wood. In Montreal (Zone 4/5), it's at its hardiness limit. Even with 7 feet of snow protecting canes, the flower buds—formed the previous summer—likely freeze during winter or early spring cold snaps. The canes survive, but the buds don't.

This rose is also notoriously finicky. In borderline zones, consider replacing it with a hardier once-blooming climber like 'William Baffin' or 'John Cabot' that reliably flowers on new wood or has hardier buds.