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Calla lilies are beautiful and elegant plants that add a touch of sophistication to any garden or indoor space. However, they are sensitive to cold temperatures and require proper overwintering techniques to ensure they survive the winter months. Knowing the best practices for storing calla lilies can help you enjoy their beauty year after year.
Understanding Calla Lily Hardiness
Calla lilies (Zantedeschia spp.) are native to regions with mild climates. They are hardy in USDA zones 8-10 but can be grown in colder areas if properly protected. When temperatures drop below freezing, the tubers and rhizomes can be damaged or killed if not stored correctly.
Timing for Overwintering
The ideal time to start overwintering calla lilies is in late fall, after the first frost has killed off the foliage. This ensures that the plant’s energy is stored in the tuber for the winter. Be sure to monitor local weather conditions to determine the right timing.
Preparing the Plant
Before removing the calla lily from the ground, cut back the foliage to about 2 inches above the tuber. Carefully dig up the tuber, avoiding damage. Gently clean off excess soil and inspect for any signs of disease or damage. Discard any unhealthy tubers.
Drying and Curing
Allow the tubers to dry in a warm, well-ventilated area for a few days. This curing process helps prevent rot during storage. Once dried, store the tubers in a paper bag or mesh container to ensure good air circulation.
Storage Conditions
Proper storage conditions are crucial for overwintering calla lilies successfully. Keep the tubers in a cool, dark, and dry place to prevent mold and rot. Ideal storage temperatures range from 35°F to 50°F (2°C to 10°C).
Choosing a Storage Location
Basements, root cellars, or unheated garages are suitable options. Ensure the storage area has consistent temperature and humidity levels. Avoid places prone to freezing or excessive dryness.
Monitoring and Maintenance
Check the stored tubers periodically during winter. Look for signs of mold, shriveling, or rotting. If any tubers show signs of decay, discard them immediately to prevent spread to healthy ones. If the environment becomes too dry, lightly mist the storage area to maintain humidity.
Replanting in Spring
As temperatures warm in spring, prepare to replant your calla lilies outdoors or in containers. Before planting, soak the tubers in water for a few hours to rehydrate. Plant them about 4-6 inches deep in well-draining soil. Water thoroughly and place in a sunny location.
Additional Tips for Successful Overwintering
- Label stored tubers to avoid confusion in spring.
- Use sterile tools when handling tubers to prevent disease.
- Keep the storage area free of pests and rodents.
- Consider dividing large tubers to propagate new plants.
With proper overwintering techniques, your calla lilies can thrive year after year, providing stunning blooms each season. Proper preparation and storage are key to ensuring their health and vitality.