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Calla lilies are a popular choice for gardeners due to their elegant blooms and lush foliage. However, in colder climates, these plants require special care to survive the winter months. Overwintering calla lilies ensures you can enjoy their beauty year after year.
Understanding Calla Lilies and Their Hardiness
Calla lilies (Zantedeschia spp.) are native to regions with mild winters. They are not frost-hardy and can be damaged or killed by freezing temperatures. Knowing the specific variety and its hardiness zone is essential for proper overwintering.
Preparing Calla Lilies for Winter
Before the first frost, you should prepare your calla lilies to survive the cold months. Proper preparation involves:
- Reducing watering to prevent rot
- Allowing the foliage to die back naturally
- Clearing and cleaning the plant area
When to Start Overwintering
The ideal time to start overwintering is after the first frost, typically in late fall. This minimizes damage and prepares the plant for dormancy.
Methods of Overwintering
There are two main methods to overwinter calla lilies: in the ground or in containers indoors.
Overwintering in the Ground
If your climate is marginal, you can try to protect the plant in the ground by mulching heavily and covering with straw or burlap. However, this method is less reliable in colder zones.
Overwintering in Containers
The most effective way is to dig up the tubers and store them indoors. Follow these steps:
- Carefully dig around the plant to lift the tubers.
- Brush off excess soil gently.
- Allow the tubers to dry in a cool, dark place for a few days.
- Store them in a paper bag with peat moss, vermiculite, or sawdust.
- Keep the storage area between 40-50°F (4-10°C).
Indoor Care During Winter
If you choose to keep calla lily tubers indoors, place them in a cool, bright location. Water sparingly, just enough to prevent the tubers from drying out. Avoid fertilizing during dormancy.
Resuming Growth in Spring
As temperatures rise and the risk of frost passes, you can start to replant the tubers outdoors or in pots. Gradually increase watering and resume fertilization to encourage healthy growth.
Tips for Successful Overwintering
- Label your tubers to avoid confusion.
- Inspect stored tubers regularly for signs of rot or pests.
- Maintain proper storage conditions for optimal health.
- Start the replanting process early in spring for a full bloom season.
By following these care guidelines, you can ensure your calla lilies survive the winter and flourish year after year, adding elegance to your garden each season.