How to Dig Up Canna Lily Bulbs for Winter Storage

Table of Contents

1. Introduction
2. Why Dig Up Canna Lily Bulbs?
3. When Is the Best Time to Dig?
4. Essential Tools for the Job
5. Step 1: Cutting Back the Foliage
6. Step 2: Lifting the Rhizomes
7. Step 3: Cleaning and Inspection
8. Step 4: The Importance of Curing
9. Step 5: Dividing the Clumps
10. Step 6: Choosing a Storage Medium
11. Step 7: The Ideal Storage Location
12. Winter Maintenance and Monitoring
13. Storing Potted Cannas
14. Preparing for Spring Replanting
15. Common Myths About Digging Cannas
16. The Joy of Sharing Your Harvest
17. Summary of the Digging and Storage Process
18. Conclusion
19. FAQ

Introduction

There is nothing quite like the tropical flair that canna lilies bring to a backyard. Their bold, architectural foliage and vibrant blooms create a vacation-like atmosphere all summer long. At Longfield Gardens, we love how these easy-to-grow plants transform a garden into a lush oasis with very little effort. As the season winds down, many gardeners look forward to preserving these beautiful plants so they can enjoy them again next year.

Digging up canna lily bulbs is a rewarding autumn ritual that allows you to expand your garden for free. While these plants are technically rhizomes rather than bulbs, the process of "lifting" them is a simple way to protect your investment from cold winter temperatures. This guide is designed for home gardeners who want a reliable, step-by-step method for overwintering their cannas successfully.

By following a few basic principles, you can keep your canna rhizomes healthy and dormant until spring returns. We will cover everything from identifying the right time to dig to the best ways to store your bulbs for the winter months. Proper care during the off-season ensures that your cannas will return with even more vigor and beauty when the soil warms up again.

Why Dig Up Canna Lily Bulbs?

Canna lilies are native to tropical and subtropical regions. Because of their origins, they thrive in warm soil and bright sunshine. While they are very sturdy during the summer, they are not naturally equipped to survive freezing ground temperatures. In most parts of the United States, particularly in USDA hardiness zones 3 through 7, the winter frost will reach deep enough to damage the fleshy rhizomes if they are left in the garden.

In these cooler regions, digging up the rhizomes is the best way to ensure they return. Think of it as giving your plants a safe, dry place to rest while the weather is harsh. In warmer climates like zone 8 and higher, cannas can often stay in the ground year-round with a thick layer of mulch for protection. However, even in warm areas, many gardeners choose to dig them up every few years to divide the clumps and prevent overcrowding.

Overwintering your own canna lilies is also a great way to save money and maintain your favorite canna varieties. Because cannas grow and multiply throughout the summer, you will often find that you have more "bulbs" in the fall than you started with in the spring. Digging them up gives you the opportunity to see that growth firsthand and prepare for an even bigger display next season.

When Is the Best Time to Dig?

Timing is one of the most important factors when it comes to digging up canna lilies. You want to give the plants as much time as possible to store energy for the winter. Throughout the summer and early fall, the leaves are busy photosynthesizing and sending nutrients down into the underground rhizomes. The longer the leaves stay green, the more "fuel" the plant has for next year.

The ideal signal to start the process is the first light frost of autumn. You will notice the lush green or bronze leaves turn black or brown after a cold night. This is a natural sign that the plant is entering dormancy. Once the foliage has been touched by frost, the plant is no longer growing, and it is safe to lift the rhizomes.

It is best to dig the bulbs before the ground freezes solid. A light surface frost that kills the leaves is helpful, but a deep freeze that penetrates several inches into the soil can damage the rhizomes. Most gardeners aim to get their cannas out of the ground within a week or two of the first frost. If you live in an area where autumn is very short, keep a close eye on the weather forecast so you can plan your digging day before a major cold snap arrives.

Essential Tools for the Job

You do not need a lot of specialized equipment to dig and store canna lilies. Most of the items are likely already in your garden shed. Having everything ready before you start will make the process much smoother and more enjoyable.

• A sturdy garden fork or shovel: A garden fork is often the preferred tool because it is less likely to slice through the rhizomes. However, a sharp spade or shovel also works well if you are careful.
• Hand pruners or garden shears: You will need these to cut back the heavy stalks before digging.
• A garden hose: This is useful for gently rinsing off excess soil so you can inspect the health of the rhizomes.
• Labels and a waterproof marker: If you grow different short canna varieties, labeling them now is essential so you know which is which in the spring.
• Storage containers: Cardboard boxes, plastic bins (with the lids off or holes for ventilation), or paper bags are all great options.
• Packing material: To keep the rhizomes from drying out too much, you will need something like peat moss, vermiculite, perlite, or even old newspapers.

Key Takeaway: Using a garden fork instead of a shovel helps you lift the entire clump of rhizomes without accidentally cutting into the fleshy roots.

Step 1: Cutting Back the Foliage

Before you reach for your shovel, you need to clear away the top growth. After the frost has blackened the leaves, use your pruners to cut the stalks down. Aim to leave about 2 to 4 inches of the stem remaining above the soil line.

Leaving a small amount of stem serves two purposes. First, it gives you a "handle" to grab onto when you are lifting the clump. Second, it helps you keep track of which way is up when it comes time to replant in the spring. Once the stalks are cut, you can add the healthy foliage to your compost pile. If the leaves show signs of pests or disease, it is better to dispose of them in the trash to keep your garden clean.

Step 2: Lifting the Rhizomes

Canna rhizomes grow horizontally and can spread quite a bit during a single season. Because of this, it is important to start digging further away from the center of the plant than you might expect. This prevents you from accidentally spearing the "bulbs" with your tool.

Start by inserting your garden fork or shovel into the soil about 8 to 12 inches away from the base of the stems. Gently rock the tool back and forth to loosen the earth. Work your way all the way around the plant in a circle. As the soil loosens, you can begin to pry the entire clump upward.

Cannas often grow in large, heavy masses. If the clump is too heavy to lift all at once, you can gently use your hands or the fork to break it into smaller, more manageable sections while it is still in the ground. Once the clump is free, lift it out and shake off the loose dirt.

Step 3: Cleaning and Inspection

Once the rhizomes are out of the ground, you will want to remove the excess soil. You can do this by hand or by using a gentle stream of water from a garden hose. Washing the rhizomes makes it much easier to see the individual sections and check for any signs of damage.

While cleaning, look for any soft spots, mushy areas, or signs of rot. Healthy canna rhizomes should feel firm to the touch, similar to a fresh potato. If you find any damaged or rotten sections, you can simply trim them away with a clean knife. It is better to remove a small damaged portion now than to let rot spread to the rest of the clump during storage.

Step 4: The Importance of Curing

Curing is a step that many new gardeners overlook, but it is vital for long-term storage success. Curing is simply the process of letting the rhizomes air-dry for a few days before you pack them away. This allows the "skin" of the rhizome to toughen up, which helps it resist rot and fungal issues during the winter.

To cure your cannas, find a dry, shaded spot with good air circulation. A garage, a covered porch, or a shed works perfectly. Lay the rhizomes out in a single layer on a piece of cardboard or a newspaper. Avoid putting them in direct sunlight, as this can cause them to dry out too quickly or "cook" in the heat.

Let the rhizomes sit for about 3 to 7 days. During this time, any remaining soil will dry up and can be easily brushed off. The cut ends of the stems will also dry out and "callus" over, creating a natural seal against moisture loss.

Step 5: Dividing the Clumps

One of the most exciting parts of digging up canna lily bulbs is seeing how much they have grown. A single rhizome planted in May can easily turn into a large mass by October. You can choose to store the clumps whole, but many gardeners prefer to divide them in the fall or spring.

To divide cannas, look for the "eyes" or growing points on the rhizomes. These look like small, pointed bumps. Each new section needs at least one or two healthy eyes to grow into a plant next year. You can usually snap the rhizomes apart by hand, or use a sharp, clean knife for cleaner cuts. Dividing your cannas every year or two ensures the plants don't become too crowded, which leads to better airflow and more impressive blooms.

Step 6: Choosing a Storage Medium

When it comes to storage, the goal is to keep the rhizomes dormant—not so wet that they rot, but not so dry that they shrivel up like a raisin. At Longfield Gardens, we recommend using a breathable packing material to help maintain this delicate balance.

There are several effective options for packing:

• Peat Moss: This is a classic choice because it holds a tiny bit of moisture while remaining airy.
• Vermiculite or Perlite: These lightweight minerals are excellent for moisture control.
• Wood Shavings: Cedar or pine shavings (the kind used for pet bedding) work well and are very affordable.
• Newspaper: If you don't have other materials, wrapping individual rhizomes in several layers of dry newspaper can also be effective.

Place a layer of your chosen material in the bottom of a cardboard box or a plastic tub. Arrange the rhizomes in a single layer so they are not touching each other. This prevents a single rotten bulb from affecting its neighbors. Cover them with more packing material and repeat the process until the container is full.

Step 7: The Ideal Storage Location

Where you keep your containers over the winter is just as important as how you pack them. Cannas need a spot that is cool and dark but stays well above freezing. The ideal temperature range for storing canna bulbs is between 40°F and 50°F.

A cool basement, a crawl space, or an insulated attached garage are usually the best spots. Avoid areas that get too warm, such as near a furnace or water heater, as this can cause the rhizomes to wake up too early and start growing in the dark. Likewise, avoid unheated sheds or detached garages in cold climates, as the rhizomes will likely freeze and turn to mush.

What to Do Next:

• Label your storage boxes with the variety and the date.
• Choose a storage spot that is easy to access so you can check on them.
• Set a reminder on your calendar to check the bulbs once a month.

Winter Maintenance and Monitoring

Overwintering is not a "set it and forget it" task. To ensure the highest survival rate, it is a good idea to check on your canna rhizomes about once a month throughout the winter. This only takes a few minutes but can save your entire collection.

Open the boxes and feel a few of the rhizomes. If they feel extremely dry and brittle or look shriveled, they may need a tiny bit of moisture. You can lightly mist the packing material with a spray bottle of water. Be very careful not to make it wet; you just want to add a hint of humidity to the air inside the box.

If you find any rhizomes that have turned soft or show signs of fuzzy mold, remove them immediately. If the rot is only on one small tip, you can cut it off back to healthy white flesh and let it air-dry before putting it back. If the entire rhizome is soft, it is best to discard it to protect the others.

Storing Potted Cannas

If you grow your cannas in large pots or containers, the process is even easier. You don't necessarily have to dig the rhizomes out of the soil. Once the frost has hit the leaves, cut the stalks down to the soil level as you would with garden-planted cannas.

Move the entire pot into a cool, frost-free location like a basement or garage. Stop watering the pot entirely. The soil will dry out, and the rhizomes will go dormant right where they are. In the spring, you can move the pot back outside, start watering again, and the cannas will begin to sprout. However, keep in mind that cannas grow very fast. If they have been in the same pot for more than one season, they will eventually become "root-bound," and you will need to tip the pot over, dig them out, and divide them to give them more room to grow.

Preparing for Spring Replanting

As winter fades and the days grow longer, your canna lilies will eventually start to "wake up" on their own. You might see small pale sprouts beginning to emerge from the rhizomes in your storage boxes. This is a sign that they are ready for the new season.

In most regions, you should wait until the danger of frost has completely passed and the soil has warmed up before planting cannas back in the ground. Cannas love warm "toes," so they won't do much until the ground feels like summer. If you want to get a head start, you can plant your rhizomes in pots indoors about 4 to 6 weeks before your last frost date. Place them in a sunny window, and by the time the weather is warm enough for them to go outside, you will already have healthy, green plants ready to take off.

Common Myths About Digging Cannas

There are many "internet hacks" regarding canna storage, but sticking to the basics is usually the most successful route. One common myth is that you must wash cannas with bleach or harsh chemicals to prevent rot. In reality, clean water and proper curing are usually all that is needed for healthy plants.

Another misconception is that cannas must be stored in airtight plastic bags. This is often a recipe for disaster, as cannas are living organisms that need a small amount of air exchange. Without airflow, moisture gets trapped, which quickly leads to mold and rot. Stick to breathable containers like cardboard boxes or open bins to keep your plants happy.

The Joy of Sharing Your Harvest

One of the best things about digging up canna lily bulbs is the abundance they provide. Because cannas are so prolific, you will almost certainly end up with more than you have space for in your garden. This makes them the perfect plant for sharing with neighbors, friends, or local garden clubs.

Passing along a few rhizomes is a wonderful way to spread the joy of gardening. When you give them away, you can share the simple instructions for planting and digging, helping others discover how easy it is to grow these tropical beauties. It is a rewarding feeling to see "your" cannas blooming in a friend's yard the following summer.

Summary of the Digging and Storage Process

Digging up canna lilies may seem like a big task, but when broken down into steps, it is a very manageable afternoon project. The key is to work with the seasons and let the plants tell you when they are ready to rest.

1. Wait for the frost: Let the first light frost turn the leaves brown or black.
2. Cut them back: Trim the stalks to about 3 inches above the ground.
3. Dig wide: Start your shovel about a foot away from the stem to avoid damage.
4. Clean and cure: Rinse off the dirt and let the rhizomes dry for several days in a shaded spot.
5. Pack loosely: Store in a breathable medium like peat moss or newspaper inside a cardboard box.
6. Store cool: Keep the boxes in a dark, frost-free area (40-50°F).
7. Check monthly: Ensure they aren't too wet or too dry during the winter.

Conclusion

Taking the time to dig up your canna lilies is a small investment that pays off in a big way. These plants add such incredible color and texture to the landscape, and knowing you can keep them year after year makes gardening even more satisfying. We take great pride in helping you find success with your garden, and overwintering is one of those skills that turns a beginner into a confident gardener.

At Longfield Gardens, our 100% Quality Guarantee is part of our goal to make sure you have the best possible experience with every bulb and rhizome you plant. By getting the basics of storage right, you ensure a vibrant, tropical-looking garden every single summer. Remember that gardening is a journey of observation and learning, and every season brings new opportunities to see your plants thrive.

• Wait for the first frost before you begin digging.
• Allow rhizomes to cure fully to prevent winter rot.
• Check your stored bulbs once a month to ensure they remain firm and healthy.

Digging up canna lilies is a simple way to preserve the tropical beauty of your garden. With a little care during the winter months, these resilient plants will return to provide spectacular color and height to your landscape season after season.

We look forward to seeing your garden grow! For more tips on growing spring-planted bulbs, explore our other planning guides and articles.

FAQ

How do I know if my canna rhizomes are still good in the spring?

When you pull your canna lilies out of storage in the spring, they should feel firm and heavy for their size. If a rhizome feels light, hollow, or very shriveled, it may have dried out too much. If it is soft or mushy, it has unfortunately succumbed to rot. Healthy rhizomes often have small, visible "eyes" or even tiny white or pink sprouts starting to emerge when they are ready to be planted.

Can I store canna bulbs in a refrigerator?

While a refrigerator provides a cool, dark environment, it is generally not recommended for storing canna rhizomes. Refrigerators are designed to remove humidity, which can cause the fleshy rhizomes to dry out far too quickly. Additionally, many fruits and vegetables in the fridge release ethylene gas, which can interfere with the dormancy and future blooming of the plants. A cool basement or crawl space is a much better choice.

Should I wash the dirt off my cannas before storing them?

Yes, it is helpful to gently wash or brush off the soil before storage. Removing the dirt allows you to inspect the rhizomes for pests or rot and makes the curing process more effective. However, be careful not to scrub them aggressively, as this can damage the skin. A gentle rinse with a hose or a light brushing once the soil has dried is all that is needed.

What happens if I forget to dig up my cannas and the ground freezes?

If the ground freezes solid before you dig up your canna lilies, the moisture inside the fleshy rhizomes will expand and turn to ice, effectively destroying the plant cells. When the ground thaws, the rhizomes will turn into mush and will not grow. If you have a surprise freeze, try digging one up to check—if it is still firm and not translucent or mushy, you might have caught it in time!