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Calla lilies are a popular choice for gardens due to their elegant blooms and lush foliage. However, in regions with cold winters, these plants require special care to survive the off-season. Overwintering calla lilies involves protecting their bulbs from freezing temperatures, ensuring they can bloom beautifully year after year.
Understanding Calla Lily Dormancy
Calla lilies (Zantedeschia spp.) are perennial plants native to warmer climates. In colder regions, they enter a period of dormancy during winter. During this time, the above-ground parts die back, but the underground bulbs or rhizomes remain alive if properly protected. Recognizing this dormancy is key to successful overwintering.
Preparing Calla Lilies for Winter
Before winter arrives, it’s essential to prepare your calla lilies to withstand the cold. Proper preparation includes:
- Reducing watering to prevent rot
- Fading and removing dead foliage
- Mulching around the plants for insulation
In regions with freezing temperatures, it’s often best to dig up the bulbs after the foliage has died back, usually in late fall. This prevents the bulbs from freezing and rotting in the ground.
Digging Up and Storing Calla Lily Bulbs
Carefully dig around the bulbs using a garden fork or trowel, being cautious not to damage them. Gently lift the bulbs out of the soil and brush off excess dirt. Allow them to dry in a warm, shaded area for a few days before storage.
Storing Calla Lily Bulbs
Proper storage is crucial for overwintering success. Store the dried bulbs in a cool, dry, and dark place such as a basement or garage. Use paper bags, mesh baskets, or cardboard boxes to allow air circulation. Avoid plastic containers, which can trap moisture and cause rot.
Replanting in Spring
Once the danger of frost has passed, typically in early spring, it’s time to replant your calla lily bulbs. Choose a sunny location with well-drained soil. Plant the bulbs about 4-6 inches deep, spacing them 12-18 inches apart. Water thoroughly after planting to encourage growth.
Additional Tips for Successful Overwintering
Here are some extra tips to ensure your calla lilies survive the winter:
- Label stored bulbs to remember variety and planting date.
- Inspect bulbs periodically for signs of rot or pests.
- If you live in a milder climate, mulch heavily around plants instead of digging up bulbs.
- Consider growing calla lilies in containers, which can be moved indoors during winter.
With proper overwintering techniques, your calla lilies will reward you with stunning blooms year after year, adding elegance and color to your garden.