Clean-Cut Damage at Knockout Rose Base: Identifying the Culprit

Rodents, Not Disease, Are Girdling Your Knockouts

A gardener reports many Knockout roses with crowns “cleanly cut, almost with pruners” at soil level. No other plants affected.

Diagnosis: Sharp-Teethed Rodent

• Rabbits and squirrels are the usual suspects—both love tender rose bark and canes.
• Voles/mice girdle stems under snow or mulch cover.
• Deer browse tops, not bases.

How to Confirm & Control

1. Inspect at dawn/dusk for activity.
2. Look for: droppings, gnaw marks (paired grooves), burrow entrances near crowns.
3. Physical barrier: 18-24" hardware cloth cylinders around each crown, buried 2" deep.
4. Repellents: Blood meal, predator urine, or commercial capsaicin sprays (reapply after rain).
5. Habitat reduction: Remove brush piles, tall grass, and deep mulch against stems.

Will They Recover?

If the graft union (knob at base) is intact, Knockouts often push new basal shoots from below the cut. Prune damaged canes cleanly, fertilize lightly, and protect the crown. Most bounce back vigorously.