Give your calla lilies a cozy winter slumber for a spectacular spring awakening.
Calla lilies (Zantedeschia aethiopica) are not true lilies but tender, rhizomatous plants that don’t tolerate freezing temperatures. In colder climates where the ground freezes, it’s essential to winterize calla lily bulbs, or rather, their rhizomes, to ensure their survival and vibrant blooms the following season. This involves carefully lifting the rhizomes from the ground after the first frost, properly cleaning and storing them, and then replanting them in the spring.
Digging and Storing Calla Lily Bulbs for Winter
Calla lilies, with their elegant, trumpet-shaped blooms, bring a touch of the tropics to gardens. However, these beauties are not cold-hardy in regions that experience freezing temperatures. Therefore, to ensure their survival and enjoyment for years to come, it is essential to properly dig and store calla lily bulbs during the winter months.
As the first frost approaches and the foliage of your calla lilies begins to yellow and wither, it is time to prepare them for their winter slumber. Using a garden fork or shovel, carefully lift the bulbs from the ground, taking care not to damage the fleshy rhizomes. Gently brush off any excess soil, but refrain from washing the bulbs, as this can introduce moisture and lead to rot.
Once the bulbs are lifted, it is crucial to allow them to cure properly. This process involves drying the bulbs for a short period to help prevent fungal diseases during storage. Spread the bulbs out in a single layer in a well-ventilated, shady location for approximately one to two weeks. During this time, the outer skin of the bulbs will dry and harden, providing a natural protective barrier.
After curing, the calla lily bulbs are ready for storage. Choose a cool, dark, and dry location, such as a basement, crawlspace, or even a cool closet. Ideally, the storage temperature should remain between 45 and 55 degrees Fahrenheit. Place the bulbs in a breathable container, such as a cardboard box or paper bag, and cover them with a layer of peat moss, vermiculite, or sawdust. This will help to maintain optimal moisture levels and prevent the bulbs from drying out.
Throughout the winter months, it is important to check on the stored bulbs periodically. Gently inspect them for any signs of rot, mold, or shriveling. Should you encounter any bulbs that appear diseased or damaged, promptly discard them to prevent the issue from spreading to healthy bulbs.
With the arrival of spring and the promise of warmer temperatures, you can begin to anticipate the return of your calla lilies. After the last frost has passed, retrieve the bulbs from storage and prepare them for replanting. Inspect the bulbs once more, discarding any that show signs of damage. Pot them up or plant them directly into the garden, and soon you will be rewarded with their stunning blooms, a testament to the care you took in preserving them through the winter.
Overwintering Calla Lilies Indoors: A Step-by-Step Guide
Calla lilies, with their elegant blooms and vibrant colors, bring a touch of the tropics to gardens throughout the summer. However, as temperatures begin to drop, it becomes crucial to protect these tender bulbs from the harsh chill of winter. Overwintering calla lilies indoors is a straightforward process that ensures their survival and allows you to enjoy their beauty year after year.
The first step in this process is to carefully dig up the bulbs. Once the foliage has yellowed or begun to die back naturally, usually after the first frost, it signals the ideal time to lift the bulbs from the ground. Using a garden fork or shovel, gently loosen the soil around the perimeter of the plant, being cautious not to damage the rhizomes. Carefully lift the entire plant from the ground, shaking off any excess soil.
Next, it is essential to prepare the bulbs for their dormant period. Begin by cutting back the foliage to approximately 2-3 inches above the bulb. This step helps redirect the plant’s energy towards bulb storage rather than foliage maintenance. Thoroughly clean the bulbs, removing any remaining soil, and inspect them for any signs of damage or disease. Discard any bulbs that appear soft, discolored, or diseased to prevent the spread of potential problems.
Proper storage is crucial for the successful overwintering of calla lily bulbs. Allow the bulbs to dry for a few days in a well-ventilated area out of direct sunlight. Once dried, place them in a breathable container, such as a paper bag or cardboard box, layered with peat moss, vermiculite, or dry sand. These materials help regulate moisture levels and prevent the bulbs from rotting.
Finally, store the container in a cool, dark, and dry location. Ideally, the storage temperature should remain between 45-55°F (7-13°C). A basement, unheated garage, or crawl space can provide suitable conditions. Regularly check the bulbs throughout the winter, discarding any that show signs of rot or decay.
By following these steps, you can ensure the successful overwintering of your calla lily bulbs. Come spring, you can then replant them outdoors after the last frost, where they will reward you with their stunning blooms once again. With proper care and attention, your calla lilies can thrive for many seasons, bringing a touch of summer elegance to your garden year after year.
Protecting Calla Lilies in Mild Climates: Winter Care Tips
In regions where winter temperatures remain above freezing, calla lilies (Zantedeschia) can often be left in the ground year-round. However, even in mild climates, taking steps to winterize these elegant flowers can ensure their continued health and a vibrant display in the following season. As temperatures begin to cool, typically in late autumn, it’s advisable to reduce watering. This shift in moisture helps the plant prepare for dormancy and discourages new growth that could be vulnerable to unexpected cold snaps.
Furthermore, applying a layer of mulch around the base of the plant provides valuable insulation. A 2- to 4-inch layer of organic material, such as shredded bark or straw, helps regulate soil temperature, protecting the rhizomes from minor frost events. While calla lilies in mild climates may not experience heavy frosts, occasional dips below freezing can damage exposed rhizomes.
Should a period of frost threaten, consider providing additional protection. A temporary cover of frost cloth or even an old sheet draped over stakes can create a microclimate, trapping heat and shielding the plants from damaging cold. Remember to remove these covers promptly once the frost danger has passed to allow for air circulation and prevent the buildup of excess moisture.
Throughout the winter months, it’s beneficial to monitor the plants for any signs of disease or pest infestation. While less common in winter, early detection allows for prompt treatment, preventing more significant problems in the spring. If you notice any yellowing or wilting foliage, remove it carefully to eliminate potential sources of disease.
As spring approaches and temperatures begin to rise, you can gradually resume regular watering. This, combined with the application of a balanced fertilizer, will encourage new growth and prepare your calla lilies for another season of stunning blooms. By following these simple winter care tips, you can ensure that your calla lilies thrive year after year, gracing your garden with their elegant beauty.
Q&A
1. **When to winterize calla lily bulbs?** After the first frost blackens the foliage.
2. **How to store calla lily bulbs for winter?** Dig up the bulbs, trim the foliage, and let them dry for a few days. Store in a cool, dry place between 50-60°F (10-15°C).
3. **Can I leave calla lily bulbs in the ground over winter?** Only in zones 8 and warmer. In colder zones, they need to be dug up and stored.Calla lily bulbs need to be dug up and stored for winter in cold climates, as they are not cold-hardy.
