How to Winterize Rosemary Plants for Cold Climates

Overview

Rosemary is a fragrant, flavorful herb that's relatively easy to grow. However, cold winters can damage or kill the plant. By winterizing—cutting back and insulating—you can protect your rosemary so it returns vigorously in spring with fresh growth and scent.

Winterizing Steps

Step 1: Wait for Hard Frost

After the first hard frost, use pruners to cut stems back to just a couple of inches above ground.

Step 2: Cover with Soil or Compost

Completely cover the remaining plant with garden soil or compost so no foliage is visible.

Step 3: Insulate with Mulch

Add 4–5 inches of mulch over the soil layer to lock in warmth and protect roots from freezing.

Step 4: Watch for Spring Growth

In spring, when nighttime temperatures stay above freezing, look for new growth pushing through the mulch.

Step 5: Uncover Gradually

Once new growth appears, pull back the mulch and soil, leaving a 2–3 inch mulch layer around the base for the growing season.