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Caring for canna lilies in the winter is essential to keep these vibrant, tropical plants healthy year after year.
Since canna lilies are not frost-hardy, how you care for canna lilies in the winter will determine if they survive the cold months.
In this post, we’ll explore exactly how to care for canna lilies in the winter, including whether to dig up or leave the rhizomes in the ground, how to store them, and winter protection tips.
Let’s dive into what you need to know about caring for canna lilies in the winter season.
Why Caring for Canna Lilies in the Winter Matters
Caring for canna lilies in the winter is crucial because these plants are tropical perennials that don’t tolerate freezing temperatures.
When you care for canna lilies in the winter properly, you protect their rhizomes (underground stems) from frost damage and rot.
If you don’t care for canna lilies in the winter by either lifting them or providing protection, the cold can kill the plants, forcing you to buy new ones next spring.
By understanding how to care for canna lilies in the winter, you ensure their vibrant blooms return year after year.
1. Understanding the Cold Sensitivity of Canna Lilies
Canna lilies thrive in warm climates and are hardy only in USDA zones 7-10, depending on the variety.
In regions where temperatures drop below 40°F (4°C), canna lilies require special care to survive winter.
Since canna lilies are sensitive to frost and freezing conditions, how to care for canna lilies in the winter involves protecting the rhizomes from freezing soil temperatures.
2. Why Rhizomes Need Winter Care
The rhizomes store energy for the plant to regrow in spring, so if the rhizomes freeze or rot, the plant dies.
Caring for canna lilies in the winter revolves around keeping the rhizomes dry, cool, and frost-free.
Improper winter care can cause rhizomes to rot from excess moisture or freeze in the ground.
3. Deciding Whether to Dig Up or Leave Your Canna Lilies
One of the biggest questions about how to care for canna lilies in the winter is whether to dig up the rhizomes or leave them in place.
In mild climates where the ground rarely freezes, you can leave canna lilies in the ground, covering them with mulch for insulation.
In colder zones, digging up the rhizomes before the first frost is the safest way to care for canna lilies in the winter.
This helps protect the rhizomes from freezing and rotting in the wet soil.
How to Care for Canna Lilies in the Winter by Digging Up Rhizomes
If you choose to dig up your canna lilies as part of caring for them in winter, here’s exactly how to do it.
1. Wait for the Right Time to Dig Up
Canna lilies should be dug up after the first frost blackens the leaves but before the ground freezes.
The frost signals the plant to go dormant and the rhizomes are ready to be lifted for winter storage.
2. Carefully Dig Up the Rhizomes
Use a garden fork or shovel to loosen the soil around the base of the canna lily clump.
Gently lift the rhizomes, taking care not to damage them.
Shake off excess soil but don’t wash them with water as moisture encourages rot during storage.
3. Clean and Inspect the Rhizomes
Remove any dead or soft parts from the rhizomes using a clean, sharp knife.
Healthy rhizomes should be firm and plump.
Discard any that show mold or mushiness to prevent spreading rot.
4. Dry the Rhizomes Before Storing
Allow the rhizomes to air-dry in a shaded, dry spot for a few days.
This helps the cut surfaces heal and reduces the chance of mold.
5. Store the Rhizomes Properly
Place your dried rhizomes in a breathable container like a cardboard box or paper bag.
Pack them in peat moss, vermiculite, or dry sawdust to absorb moisture and keep them dry.
Keep them stored in a cool (around 50°F or 10°C), dark, and dry place like a basement or garage.
Check monthly and remove any rhizomes that show signs of rot during winter storage.
How to Care for Canna Lilies in the Winter Without Digging Up
If you live in a warmer climate or want a lower effort method, you can care for canna lilies in the winter by protecting them in the ground.
1. Mulching for Insulation
After the first frost, cut back canna lily foliage to about 4-6 inches above the ground.
Cover the soil around the rhizomes with a thick layer of mulch like straw, shredded leaves, or wood chips.
This mulch layer acts as insulation, keeping soil temperatures steady and protecting rhizomes from freezing.
2. Avoid Overwatering
Since the plants are dormant, reduce watering to prevent soggy soil.
Too much moisture combined with cold temperatures can cause rhizomes to rot.
3. Consider Using a Frost Blanket
If a hard freeze is forecasted, you can cover your canna lilies with a frost cloth or blanket at night.
This extra layer of protection helps shield the plants and rhizomes from frost damage.
Remember to remove the cover during the day to avoid overheating and moisture buildup.
4. Leave Rhizomes in the Ground Only if You Are Sure Freezing Won’t Occur
In USDA zones 8-10, winters are mild enough that canna rhizomes often survive in the ground when mulched well.
If your area has occasional or light frosts, mulching and frost blankets should suffice.
Additional Tips for Caring for Canna Lilies in the Winter
Here are a few more tips that will help you successfully care for canna lilies in the winter.
1. Label Your Rhizomes
If you dig up multiple varieties, label your rhizomes to remember which is which when you replant in the spring.
2. Prepare Soil Before Replanting
When replanting in spring, enrich the soil with compost or organic matter.
Good soil preparation helps the canna lilies bounce back after winter dormancy.
3. Water Sparingly During Dormancy
If you store your rhizomes indoors, keep them dry but occasionally check for shriveling, which signals slight watering may help.
4. Watch for Pests and Diseases
Inspect rhizomes before storing and when taking out of storage.
Remove any that show signs of insect damage or disease to protect other stored rhizomes.
5. Gradually Reintroduce to Outdoors
When spring warms up, gradually acclimate your canna lilies to outdoor conditions if they’ve been stored inside.
This practice eases transplant shock and supports healthy growth.
So, How to Care for Canna Lilies in the Winter?
How to care for canna lilies in the winter depends largely on your climate and whether you choose to dig up the rhizomes or leave them in the ground.
If you live in colder climates, caring for canna lilies in the winter means digging up the rhizomes after frost, drying them, and storing them in a cool, dry place until spring.
In warmer areas, you can care for canna lilies in the winter by cutting back the foliage, applying thick mulch, and possibly covering with a frost blanket during freezes to protect the rhizomes in the ground.
Proper winter care ensures your canna lilies come back healthy, delivering their colorful, bold blooms year after year.
By understanding how to care for canna lilies in the winter and following the steps laid out here, you’ll have a vibrant garden full of these tropical beauties whenever the warm season returns.