How to Dig Up and Store Canna Lily Bulbs

Table of Contents

1. Introduction
2. When to Dig Up Canna Lily Bulbs
3. Preparing Your Cannas for Storage
4. How to Dig Up Canna Rhizomes Safely
5. Cleaning and Inspecting the Harvest
6. The Importance of Curing
7. Should You Divide Now or in the Spring?
8. Choosing the Right Storage Container
9. Finding the Best Storage Location
10. Monitoring Your Cannas Through Winter
11. Preparing for Spring Planting
12. Growing Cannas in Containers
13. Why Quality Matters
14. Summary of Canna Storage Success
15. Conclusion
16. FAQ

Introduction

Few things bring as much tropical flair to a backyard as the bold foliage and vibrant blooms of canna lilies. These plants are true summer champions, standing tall through the heat when other flowers might begin to fade. At Longfield Gardens, we enjoy seeing these architectural plants transform a garden into a lush oasis. Because canna lilies are so reliable and beautiful, it is natural to want to save your favorite varieties for the next growing season.

If you live in a region with cold winters, canna lilies require a little extra care to survive the frost. While they are often called bulbs, they actually grow from fleshy underground stems known as rhizomes. In cooler climates, these rhizomes cannot stay in the frozen ground. Learning how to dig up and store canna lily bulbs is a simple and rewarding process that ensures your garden will be just as beautiful next year.

This guide will walk you through the timing, tools, and techniques needed to overwinter your cannas and other spring-planted bulbs successfully. Whether you are a first-time gardener or a seasoned pro, these steps make the transition from fall to winter easy and stress-free. By the end of this article, you will know exactly how to protect your plants so they are ready to thrive again next spring.

Digging and storing canna lilies is a straightforward task that preserves your garden investment and keeps your favorite blooms coming back year after year.

When to Dig Up Canna Lily Bulbs

The most common question gardeners ask is when exactly to start the digging process. Timing is everything when it comes to the health of the rhizome. You want the plant to stay in the ground as long as possible to gather energy, but you must remove it before the soil itself freezes solid.

Nature provides a very clear signal for when it is time to move. In most regions, you should wait until a light frost has touched the garden. This first frost will turn the lush green or bronze leaves of your cannas brown or black. While this might look disappointing at first, it is actually a helpful part of the plant’s life cycle. The frost tells the plant to stop growing leaves and send all its remaining energy down into the rhizome for winter storage.

If you live in a warmer area, such as USDA Zone 7 or 8, you may have more flexibility. Some gardeners in these zones can leave their cannas in the ground with a thick layer of mulch. However, if you want to rotate your planting beds or if a particularly cold winter is predicted, digging them up is the safest bet. For those in Zones 3 through 6, digging is a mandatory part of fall garden cleanup.

Key Takeaway: Wait for the first light frost to blacken the foliage before you begin digging. This ensures the rhizomes have stored enough energy to sprout vigorously in the spring.

Preparing Your Cannas for Storage

Before you reach for your shovel, you need to prepare the top of the plant. Dealing with several feet of foliage can make digging awkward and messy. Once the frost has hit and the leaves have wilted, use a pair of clean garden shears or a sharp knife to cut the stalks back.

We recommend leaving about 2 to 4 inches of the stem attached to the rhizome. This small "handle" makes it easier to move the clumps without accidentally bruising the fleshy parts of the plant. Cutting the foliage back also helps you see exactly where the base of the plant is, which prevents you from accidentally slicing into the rhizome with your shovel.

When you cut the stalks, you may notice they are quite fibrous and hold a lot of water. This is normal. You can add the healthy, spent foliage to your compost pile, provided it does not show signs of disease. Clearing away the top growth gives you a clean workspace and prepares the plant for its winter nap.

Tools You Will Need

• A garden fork or a sharp spade shovel
• Bypass pruners or garden shears
• A garden hose with a spray nozzle (optional)
• Labeling tape or a permanent marker
• Boxes or crates for storage

How to Dig Up Canna Rhizomes Safely

Digging up canna lilies is much like harvesting potatoes. The goal is to lift the entire clump out of the ground in one piece without causing any "wounds" or cuts. A wound on a rhizome can become an entry point for rot during the winter months.

Start by placing your shovel or garden fork about 6 to 12 inches away from the base of the stems. This distance ensures that you stay clear of the expanding root system. Push the tool straight down into the soil and gently rock it back and forth to loosen the earth.

Work your way around the entire plant in a circle. Once you have loosened the soil all the way around, gently pry the clump upward. If the plant is large, you may feel some resistance. Avoid pulling on the stems themselves, as they can snap off easily. Instead, use your tool to lift from underneath while supporting the weight of the clump with your hands.

What to Do Next: Digging Steps

• Cut foliage back to a few inches above the soil line.
• Dig a wide circle around the plant to avoid damaging the roots.
• Lift the clump gently from underneath using a garden fork.
• Shake off large chunks of loose soil immediately.

Cleaning and Inspecting the Harvest

Once the cannas are out of the ground, you will likely have a large, heavy clump of rhizomes and soil. There are two main schools of thought regarding cleaning. Some gardeners prefer to shake off the loose dirt and leave the rest, while others prefer to wash the rhizomes clean with a hose.

If your soil is sandy and falls away easily, a quick shake is usually enough. If you have heavy clay soil, you may want to rinse the rhizomes with water. This allows you to see the health of the plant more clearly. If you do wash them, remember that they must be dried thoroughly before they go into storage.

As you clean, take a moment to inspect each clump. You are looking for firm, plump rhizomes that feel heavy for their size. If you see any soft, mushy, or shriveled spots, use a clean knife to trim those sections away. Healthy canna rhizomes look a bit like ginger root and should have several "eyes" or growing points visible.

Key Takeaway: Keep only the healthiest, firmest rhizomes for storage. Discarding damaged or soft pieces now prevents rot from spreading to the rest of your collection during the winter.

The Importance of Curing

Curing is a fancy word for letting the rhizomes air-dry before they are packed away. This is one of the most important steps in the process. If you pack wet rhizomes into a box, they are almost certain to grow mold or rot.

Find a spot that is dry, well-ventilated, and out of direct sunlight. A garage, a covered porch, or a basement floor works well. Spread the rhizomes out in a single layer so that air can circulate around them. If you rinsed them with a hose, they might need two or three days to dry completely. If they were already mostly dry when they came out of the ground, 24 hours might be enough.

During this time, the outer skin of the rhizome will toughen up slightly. This creates a natural barrier that helps the plant retain its internal moisture while resisting external fungi. You want the outside to feel dry to the touch, but the rhizome itself should still feel firm and heavy, not shriveled.

Should You Divide Now or in the Spring?

Cannas are vigorous growers, and a single rhizome planted in the spring can easily turn into a large clump by autumn. Many gardeners wonder if they should break these clumps apart before storing them.

At Longfield Gardens, we usually suggest waiting until spring to do your final division. Storing the rhizomes in larger clumps helps prevent them from drying out too much over the winter. Large clumps have less surface area exposed to the air than many small pieces.

However, if your clumps are simply too large to fit into your storage containers, you can certainly break them into smaller, manageable sections. Just make sure each piece has at least two or three "eyes." These are the small bumps or points where new growth will emerge. If you do divide them now, give the cut ends an extra day of curing time to callously over before packing them away.

Choosing the Right Storage Container

The goal of storage is to keep the rhizomes dormant, cool, and just slightly moist. You don't want them to be wet, but you also don't want them to turn into hard, dry sticks. The container you choose plays a big role in maintaining this balance.

Cardboard boxes, plastic bins with the lids left cracked, or even old milk crates are all excellent choices. Some gardeners even use breathable burlap sacks. Avoid airtight plastic containers, as these trap moisture and lead to rot.

To help regulate moisture, most gardeners use a "packing medium." This is a material that surrounds the rhizomes and acts as a buffer.

Popular Packing Materials

• Peat Moss: Excellent at holding just the right amount of moisture.
• Perlite or Vermiculite: Clean, lightweight, and provides great aeration.
• Damp Sand: Very traditional, though it makes the storage boxes heavy.
• Newspaper: Simple and effective; just wrap individual clumps loosely.
• Wood Shavings: Often used for pet bedding, these are inexpensive and work well.

Finding the Best Storage Location

Now that your cannas are packed, they need a home for the next few months. The ideal environment is dark, dry, and cool. You are looking for a temperature range between 40°F and 50°F.

If the temperature is too warm, the cannas might think it is spring and start growing in the dark. If the temperature drops below freezing, the water inside the rhizomes will freeze, which kills the plant. A cool basement, a crawl space, or an insulated (but unheated) garage is often the perfect spot.

If you are using a garage, be careful. In very cold climates, a garage can still drop below freezing during a winter cold snap. Placing your storage boxes on a shelf rather than directly on a cold concrete floor can provide a few extra degrees of protection.

What to Do Next: Storage Prep

• Label your boxes by color or variety name.
• Place a layer of packing medium in the bottom of the container.
• Nestle the rhizomes inside, ensuring they aren't touching each other.
• Cover with more packing medium and move to a cool, dark spot.

Monitoring Your Cannas Through Winter

Storage isn't a "set it and forget it" task. To ensure a high success rate, we recommend checking on your rhizomes about once a month. This small effort can save your entire collection if something goes wrong.

When you check your cannas, look for two things: rot and shriveling.

If you find a rhizome that feels soft or smells bad, remove it immediately. Rot can spread quickly through a box, so getting the "bad apple" out is essential. If only a small tip is soft, you can cut it back to healthy white flesh and let it air-dry for a day before putting it back.

On the other hand, if the rhizomes look very wrinkled or feel light, they may be drying out too much. If this happens, use a spray bottle to lightly mist the packing medium with water. You don't want it to be wet—just a tiny bit of humidity is enough to plump the rhizomes back up.

Key Takeaway: A quick monthly check allows you to adjust moisture levels and remove any damaged pieces before they affect the rest of your plants.

Preparing for Spring Planting

As the days get longer and the ground begins to thaw, it is time to start thinking about the garden again. About 4 to 6 weeks before the last expected frost, you can bring your canna boxes out of storage.

This is the perfect time to do your final divisions. Use a clean, sharp knife to cut the clumps into sections. Ensure every piece has at least a few healthy eyes. Let the cuts dry for a day or two, and then you are ready to go.

In many regions, gardeners like to "pot up" their cannas indoors to give them a head start. By planting them in containers in a sunny window or under grow lights, you can have plants that are already several inches tall by the time the outdoor soil is warm enough for planting. Cannas love warm soil, so wait until the ground is at least 60°F before moving them into their permanent summer home.

Growing Cannas in Containers

If you grow your canna lilies in large pots rather than in the ground, the overwintering process is even easier. You don't necessarily have to dig them out of the soil at all.

Once the frost has hit the foliage, cut the stalks back to the soil line as you would with garden-grown plants. Instead of digging, simply move the entire pot into a cool, frost-free area like a basement or a storage closet. Stop watering the pot entirely. The soil will dry out, and the rhizomes will go dormant right where they are.

In the spring, move the pot back into the sun and begin watering again. You may need to refresh the top few inches of soil with some compost or new potting mix. Every two or three years, you should still remove the plants from the pot to divide them, as cannas can become "root-bound" very quickly in a container.

Why Quality Matters

When you put in the effort to dig and store your plants, you want to start with the best possible stock. At Longfield Gardens, we work with experienced growers to ensure that the rhizomes we ship are healthy, vigorous, and true to their variety names. Starting with high-quality plants makes the storage process much more successful because healthy plants have better natural resistance to winter stresses.

Whether you are growing the classic tall ‘President’ with its bright red blooms or a striking variegated foliage variety, the care you provide in the fall pays off in the summer. Gardening is all about the cycle of the seasons, and there is a deep satisfaction in seeing a plant you protected all winter burst into bloom in July.

Key Takeaway: Successful overwintering starts with healthy plants. Choose firm, high-quality rhizomes and follow the simple steps of cleaning, curing, and cooling for the best results.

Summary of Canna Storage Success

Digging up canna lilies doesn't have to be a chore. It is simply the final chapter of the summer garden and the first step toward next year’s beauty. By following the natural cues of the seasons, you can maintain a stunning collection of tropical plants regardless of how cold your winters get.

Remember the basics: wait for the frost, dig carefully to avoid wounds, dry the rhizomes thoroughly, and store them in a cool, dark place. These simple habits are the secret to the lush, tall cannas you see in the most beautiful professional landscapes.

• Timing: Dig after the first frost but before the ground freezes.
• Preparation: Cut stalks to 2-4 inches for easy handling.
• Curing: Let rhizomes air-dry for 1-3 days to prevent rot.
• Storage: Use a breathable container with peat moss or newspaper.
• Environment: Keep them in a dark spot between 40°F and 50°F.

Conclusion

Taking the time to protect your canna lilies is a rewarding part of the gardening journey. It allows you to build a larger collection of these spectacular plants each year as they naturally multiply. At Longfield Gardens, we believe that gardening should be an enjoyable and successful experience for everyone. By following these straightforward steps, you can look forward to a garden filled with tropical color and impressive foliage every summer. We invite you to explore our selection of high-quality canna varieties and other summer-blooming bulbs to keep your garden vibrant year after year.

Digging and storing canna lilies is one of the easiest ways to ensure your garden remains a lush, tropical retreat every summer without having to start from scratch.

FAQ

Can I store canna lilies in a refrigerator?

While a refrigerator is cool and dark, it is usually too cold and dry for canna rhizomes. Most refrigerators are kept around 35-38°F, which can damage the tropical tissues of the canna. Additionally, the lack of airflow and the presence of ethylene gas from ripening fruit can cause the rhizomes to rot or fail to sprout.

Do I need to wash the dirt off the rhizomes before storing them?

Washing is optional and depends on your soil type. If you have sandy soil that falls away easily, shaking them clean is sufficient. If you have heavy clay, washing helps you inspect for rot, but you must ensure the rhizomes are completely dry before packing them away to prevent mold.

What happens if I forget to dig up my cannas before a hard freeze?

A light frost only kills the leaves, which is fine. However, a hard freeze that penetrates the ground can turn the rhizomes into mush. If a deep freeze is predicted and you haven't dug them yet, cover the area with a thick layer of mulch or a heavy tarp to buy yourself a few extra days.

Why did my stored canna rhizomes turn soft and mushy over the winter?

Mushiness is almost always caused by too much moisture or a lack of airflow during storage. This usually happens if the rhizomes weren't cured (dried) long enough before packing, or if they were stored in an airtight plastic container. To prevent this, ensure they are dry to the touch and stored in a breathable box.