Ants on Roses: Harmless or Harmful? Spring Care for Winter-Protected Roses

A gardener in Central Square, NY discovered hundreds of ants in the mulch under a plastic pail covering a rose bush for winter. The bush shows green leaves emerging, but the ants raise concern.

Are Ants a Problem?

Ants don't harm roses—they simply nest in mulch. They're attracted to the shelter and moisture, not the plant. Removing the mulch and pail will encourage them to relocate. Insecticides can be used if desired, but aren't necessary.

When to Remove Winter Protection

In spring, gradually acclimate the rose: remove the pail during the day when temperatures are above freezing, replace at night. After a week or two of frost-free nights, remove protection permanently. This hardening-off process prevents tender new growth from being killed by late frosts.

Your rose is waking up normally. The ants are just temporary tenants.