What To Know
- Store the bulbs in a paper bag or cardboard box in a cool, dark place, such as a basement or unheated garage.
- In late winter or early spring, bring the calla lily bulbs indoors and place them in a warm, sunny location.
Calla lilies, with their elegant trumpet-shaped blooms and lush foliage, are a beloved addition to any garden. However, as winter approaches, it’s crucial to take proper care of these beautiful plants to ensure their survival and a vibrant spring display. This comprehensive guide will provide you with all the essential steps on how to overwinter calla lily successfully.
Hardiness Zones and Overwintering Methods
Calla lilies are classified into two hardiness zones:
- Zone 7 and above: Calla lilies can remain outdoors year-round with minimal protection.
- Zone 6 and below: Calla lilies must be overwintered indoors or in a protected environment.
Depending on your hardiness zone, you can choose from two primary overwintering methods:
Indoor Overwintering
Step 1: Dig Up Calla Lilies
In late fall, carefully dig up the calla lily bulbs and remove any excess soil.
Step 2: Dry the Bulbs
Place the bulbs in a warm, dry location for a few days to allow them to dry thoroughly.
Step 3: Store in a Cool, Dark Place
Store the bulbs in a paper bag or cardboard box in a cool, dark place, such as a basement or unheated garage. The ideal storage temperature is between 40-50°F (4-10°C).
Outdoor Overwintering (Zone 7 and above)
Step 1: Mulch Heavily
Apply a thick layer of mulch, such as straw, leaves, or compost, around the base of the calla lilies. This will insulate the bulbs and protect them from freezing temperatures.
Step 2: Cover with a Frost Blanket
If temperatures are expected to drop below 20°F (-7°C), cover the calla lilies with a frost blanket or burlap cloth for added protection.
Care During Overwintering
Watering: Water the calla lily bulbs sparingly during overwintering. Only water when the soil feels dry to the touch.
Fertilizing: Do not fertilize the calla lilies during overwintering.
Pest Control: Check the calla lily bulbs regularly for any signs of pests or diseases. Remove any infected bulbs immediately.
Preparing for Spring
Step 1: Bring Indoors (Zone 6 and below)
In late winter or early spring, bring the calla lily bulbs indoors and place them in a warm, sunny location.
Step 2: Replant Outdoors (Zone 7 and above)
When the soil temperature has warmed to at least 50°F (10°C), replant the calla lily bulbs outdoors in a well-drained location with plenty of sunlight.
Step 3: Water and Fertilize
Water the calla lilies regularly and fertilize them monthly with a balanced fertilizer.
Troubleshooting Common Overwintering Issues
Calla Lily Bulbs Rotting: This can be caused by overwatering or poor drainage. Ensure the soil is well-drained and only water when necessary.
Calla Lily Bulbs Not Sprouting: This can be caused by insufficient sunlight or cold temperatures. Provide ample sunlight and ensure the soil temperature is warm enough for growth.
Calla Lily Leaves Turning Yellow: This can be caused by nutrient deficiency or overwatering. Fertilize the calla lilies regularly and adjust watering frequency as needed.
Wrapping Up: Ensuring a Thriving Spring Display
Overwintering calla lilies is crucial for their survival and continued beauty in the garden. By following the steps outlined in this guide, you can ensure that your calla lilies emerge from winter dormancy vibrant and ready to bloom. With proper care and attention, you can enjoy the stunning blooms of these elegant plants for seasons to come.
Questions You May Have
Q: Can I leave calla lily bulbs in the ground over winter in Zone 7?
A: Yes, in Zone 7 and above, calla lily bulbs can remain in the ground over winter with heavy mulching and frost protection.
Q: How often should I check on my calla lily bulbs during overwintering?
A: Regularly check on the bulbs for any signs of pests, diseases, or excessive moisture.
Q: What is the best way to store calla lily bulbs indoors?
A: Store the bulbs in a paper bag or cardboard box in a cool, dark place, such as a basement or unheated garage. Ensure the storage temperature is between 40-50°F (4-10°C).
