Winter Protection Depth for Roses in Zone 4 Ontario

How Deep to Bury Roses for Zone 4 Survival

Gardener in Nipigon, Ontario (Zone 4) needs specific burial depth for winter protection.

Protection Depth by Rose Type

• Grafted roses: Bud union (knob at top of roots) 6 inches below soil surface, then mulch over
• Own-root roses: Base of canes 4 inches below soil, then mulch
• Modern roses (hybrid teas, etc.): Cage plant, fill 18 inches with loose material (perennial leaves, tree leaves—nothing that packs tight)

Principle

Protect the bud union or crown—the growing point. Depth ensures survival tissue remains below frost line. Loose fill allows air circulation preventing rot.