Planting Bare-Root Perennials Late in the Season (Zone 6a/6b)

A gardener near the zone 6a/6b border found bare-root perennials on sale late in the season and wondered if they'd survive planting now versus potting up for spring.

Assess the Weather Window

If the ground isn't frozen and several weeks of mild temperatures (above 40°F day/above freezing night) are forecast, plant directly in the ground. Water well and mulch 4-6 inches with straw, leaves, or pine needles.

If Cold Is Imminent: Pot and Protect

1. Pot each plant in a container slightly larger than the root mass using well-draining potting mix.
2. Water thoroughly.
3. Store in an unheated garage, cold frame, or against a protected house wall where temps stay 30-40°F.
4. Check monthly; water sparingly if soil is dry.
5. Plant out in early spring as soon as soil is workable.

Why This Works

Bare-root plants are dormant. Cold storage mimics winter. Potting prevents root desiccation and allows root growth during warm spells. Many nurseries hold bare-root stock this way.

Key Point

Don't leave bare-root plants in packaging—they'll dry out or mold. Act quickly either way.