Rooting Hydrangea Cuttings and Overwintering in Pennsylvania

You’ve successfully rooted hydrangea cuttings in vermiculite under plastic—now what? Here’s how to transition them to pots and get them through a Zone 6 winter in eastern PA.

Potting Up Rooted Cuttings

• Pot each cutting in a 4–6 inch container with well-draining potting mix.
• Water well and keep in bright, indirect light indoors for a week.

Winter Options

Option A: Unheated Garage (Recommended)

• Move pots to an unheated attached garage when temps consistently drop below freezing (32°F / 0°C).
• Water once a month—just enough to prevent desiccation.
• Plants will go dormant; no light needed during deep dormancy.
• Bring out in early spring (when days reach 50°F / 10°C), place in shade for 10 days, then plant outdoors.

Option B: Plant Outdoors Now with Heavy Mulch

• Plant in a protected, part-shade spot.
• Mulch 4–6 inches with straw or shredded leaves after ground freezes.
• Risk: severe cold snaps may kill tender roots in pots.

Spring and Summer Care

• Hydrangeas prefer morning sun, afternoon shade—especially in hot summers.
• Keep soil consistently moist; mulch to retain moisture.
• Clay or plastic pots both work; ensure drainage holes.

With proper dormancy care, your rooted cuttings will become robust, blooming shrubs.