One-Sided Growth on Climbing Rose: Rose Gall or Root Damage

A climber has full foliage on one half, stunted growth on the other. Gardener asks why.

Cause 1: Crown Gall (Agrobacterium)

Bacteria enter wounds on canes, causing swollen, ball-like galls (pea to golf ball size). Galls restrict water/nutrient flow to affected canes. Check old wood (brown canes) from base to top—not new green growth.

• Action: Cut off galled canes entirely, even to base. Disinfect pruners between cuts.

Cause 2: Root Damage from Rodents

Mice, voles, rabbits chew roots on one side, causing corresponding top-growth decline.

• Action: Inspect root zone. Use hardware cloth barriers if rodents active.

Galls are more common on older roses. Remove affected wood promptly—galls enlarge and spread bacteria.