Best Way to Store Canna Lily Bulbs

Table of Contents

1. Introduction
2. Understanding Canna Lily Rhizomes
3. When to Dig Up Your Cannas
4. Preparing to Dig
5. The Best Way to Dig Canna Rhizomes
6. The Curing Phase
7. Selecting a Storage Container
8. Choosing Your Packing Material
9. Step-by-Step Packing Method
10. Ideal Storage Conditions
11. Mid-Winter Maintenance
12. Dividing Your Cannas
13. Storing Container-Grown Cannas
14. Moving from Storage to Spring Planting
15. Conclusion
16. FAQ

Introduction

Canna lilies are the undisputed stars of the summer garden. Their oversized, tropical leaves and brilliant blooms bring a sense of exotic beauty to any backyard or patio. While these plants thrive in the heat of July and August, they are quite sensitive to the cold. For gardeners in northern climates, the arrival of autumn brings a choice. You can let the frost take them, or you can save those vigorous roots to grow again next year.

At Longfield Gardens, we want every gardener to feel confident about keeping their favorite plants healthy year after year. Saving your canna rhizomes is a rewarding way to build a bigger garden for free. It is a straightforward process that requires only a bit of timing and a cool, dry place to tuck them away. Once you master the technique, you can enjoy these spectacular bloomers every single summer.

This guide will walk you through the best way to store canna lily bulbs from the first frost until the spring thaw. We will cover how to dig them, the importance of curing, and the ideal conditions for winter dormancy. By following these simple steps, you can ensure your cannas return with even more vigor next season.

Understanding Canna Lily Rhizomes

Before you reach for your shovel, it helps to understand what you are actually digging up. Although most gardeners call them bulbs, cannas actually grow from rhizomes. A rhizome is a thick, fleshy underground stem that stores energy for the plant. During the summer, the plant uses this energy to produce those tall stalks and vibrant flowers.

In the fall, the plant begins to shift its focus. As the days shorten and temperatures drop, the canna moves its remaining energy from the leaves down into the rhizome. This is why the timing of your harvest is so important. You want to give the plant as much time as possible to store food for the following year.

A healthy rhizome should feel firm and heavy for its size. It will often have several "eyes" or growing points, which look like small bumps or tips. These eyes are where new stalks will emerge in the spring. Protecting these growing points during the storage process is the key to a successful start next season.

When to Dig Up Your Cannas

Timing is everything when it's time to bring your tropical plants indoors. The best signal to start digging is the weather. You should wait for the first light frost of the autumn season. This cold snap will typically turn the lush green leaves to a dark brown or black color.

Do not worry when the foliage looks damaged after a frost. This is actually a helpful sign from nature. It tells the plant that the growing season is over and it is time to go dormant. Leaving the plants in the ground until this frost happens allows the rhizomes to reach their maximum size and energy capacity.

However, you must act before the ground actually freezes solid. A light surface frost will kill the leaves but won't reach the rhizomes buried in the soil. A hard, deep freeze can damage or kill the fleshy roots. If you live in a region where the ground freezes quickly, keep a close eye on the forecast after the first frost hits. If you want help planning ahead, use our Hardiness Zone Map.

Key Takeaway: Wait for the first frost to blacken the leaves, then dig your cannas before the soil freezes hard. This ensures the rhizomes have stored enough energy to bloom again next summer.

Preparing to Dig

Having the right tools ready will make the job much faster and prevent damage to the plants. You do not need specialized equipment. A sturdy garden spade, a shovel, or a large garden fork will work perfectly. Many gardeners prefer a garden fork because it is less likely to slice through the rhizomes.

Start by cutting the foliage back. Use a pair of sharp garden shears or a bypass pruner to remove the stalks. Leave about 2 to 4 inches of the stem attached to the rhizome. These short "handles" make the clumps easier to lift and help you identify which way is up later on. They also provide a bit of a buffer for the growing eyes near the base.

If you have different varieties of cannas, have your labeling materials ready. Once the leaves are gone and the dirt is on the roots, most canna rhizomes look identical. Use a waterproof marker to write the variety name or color on a plastic tag. You can also write directly on the fleshy part of the rhizome with a soft lead pencil or a garden marker after they have dried slightly.

The Best Way to Dig Canna Rhizomes

When you are ready to lift the plants, the goal is to keep the clumps as intact as possible. Canna rhizomes often grow in large, heavy clusters. If you dig too close to the center of the plant, you risk slicing through the storage tissue.

1. Find the Drip Line: Imagine a circle on the ground that matches the outer reach of the plant’s leaves. This is your safe zone.
2. Loosen the Soil: Insert your shovel or fork vertically into the soil about 6 to 10 inches away from the main stalks.
3. Work Around the Clump: Move around the plant, gently prying the soil upward at several points. This loosens the root system from the earth.
4. Lift Carefully: Once the soil is loose, slide your tool under the center of the clump and lift the entire mass upward.
5. Shake Off Excess Soil: Gently shake the clump or use your hands to brush away large clods of dirt.

Avoid being too aggressive with the cleaning at this stage. The skin on the rhizomes is often soft and tender when it first comes out of the ground. Scratches or bruises can lead to rot during the winter months. If the soil is very sticky or heavy clay, you can use a gentle stream of water from a hose to rinse them, but most gardeners find that simple shaking is sufficient.

The Curing Phase

One of the most common mistakes in storing cannas is putting them away while they are still wet. "Curing" is the process of letting the rhizomes air dry for a short period before final storage. This step allows the outer skin to toughen up and "set," which creates a natural barrier against fungus and rot.

Place your cleaned rhizomes in a well-ventilated, frost-free area. A garage, a shed, or a covered porch works well. Spread them out in a single layer on a piece of cardboard or a mesh screen. Do not stack them on top of each other, as this can trap moisture and encourage mold.

The curing process usually takes about 3 to 7 days, depending on the humidity. You want the surface of the rhizome to feel dry and the remaining bits of soil to be dusty. If you washed your rhizomes with a hose, they may need the full week to dry completely. Once they are cured, the handles you left on the stalks will likely feel dry and woody.

What to Do Next:

• Cut stalks to 4 inches.
• Lift clumps carefully with a garden fork.
• Brush off loose soil by hand.
• Air dry in a single layer for 3 to 7 days.
• Move to a cool, dry spot for final packing.

Selecting a Storage Container

The "best way" to store canna lily bulbs often depends on the space you have available. There are several different containers you can use, but they all share one goal: providing protection while allowing for a tiny bit of air exchange.

Cardboard Boxes Cardboard is an excellent choice because it is breathable. It prevents the rhizomes from sitting in stagnant air, which is the primary cause of rot. You can use standard shipping boxes or even shoe boxes for smaller collections.

Paper Bags For gardeners with only a few plants, heavy-duty paper grocery bags are a simple solution. They are easy to label and can be tucked into a corner of a basement.

Plastic Tubs (with caution) If you use plastic storage bins, do not snap the lid shut. Leaving the lid slightly ajar or drilling small ventilation holes in the sides is necessary. Without airflow, the natural respiration of the rhizomes will create condensation inside the tub, leading to certain decay.

Milk Crates or Wooden Bushel Baskets These provide the maximum amount of airflow. They are ideal if your storage area is slightly damp, as they will help the rhizomes stay dry. However, you may need to line them with newspaper to keep your storage medium from falling through the holes.

Choosing Your Packing Material

While some gardeners store their cannas "naked" in a box, using a packing medium is generally more successful. This material acts as insulation, protecting the rhizomes from temperature swings. It also helps regulate moisture, keeping the roots from drying out completely without letting them get soggy.

Peat Moss Peat moss is a classic choice. It is naturally acidic, which helps inhibit the growth of fungus. It is very lightweight and easy to handle. When using peat moss, it should be bone-dry or only very slightly damp to the touch.

Pine Shavings The kind of wood shavings used for animal bedding (available at pet or farm supply stores) is an excellent storage medium. It is inexpensive, clean, and provides great insulation. It also smells pleasant and allows for good air circulation around the rhizomes.

Vermiculite or Perlite These volcanic minerals are sterile and excellent at managing moisture. They are more expensive than shavings or peat, but they are a great option if you have had issues with rot in the past.

Newspaper If you want a budget-friendly option, shredded or bundled newspaper works well. You can wrap each individual rhizome in a few sheets of dry newsprint before placing them in a box. This prevents any rot from spreading from one root to another.

Step-by-Step Packing Method

Once your rhizomes are cured and your materials are ready, it is time to pack them away for their winter nap. This method ensures that each rhizome is protected and easy to inspect. If you are shopping for more warm-season color, browse our Spring-Planted Summer-Blooming Bulbs.

1. Line the Bottom: Place a 2-inch layer of your chosen medium (shavings, peat, or perlite) at the bottom of your container.
2. Arrange the Rhizomes: Place the canna rhizomes on top of the medium. Try to keep them from touching each other. If one happens to develop rot, the space between them prevents it from spreading to the rest of the batch.
3. Cover and Layer: Pour more medium over the rhizomes until they are completely covered. If your box is deep enough, you can add a second layer of rhizomes and cover them again.
4. Label Everything: Place a label inside the box and write the variety on the outside of the box as well.
5. Close Loosely: Close the box or bag, but do not seal it airtight.

Ideal Storage Conditions

The environment where you keep your boxes is just as important as how you pack them. Cannas need a spot that mimics their natural dormant state in the wild.

Temperature The "sweet spot" for canna storage is between 40°F and 50°F. If the area is too warm (above 60°F), the rhizomes may try to sprout prematurely or dry out too fast. If the area is too cold (below 35°F), you risk losing them to frost damage. Unheated basements, cool crawl spaces, or an attached garage that stays above freezing are usually the best locations.

Light Rhizomes should be kept in total darkness. Light can signal the plant to begin growing, which wastes the energy stored in the root.

Humidity A moderately dry area is best. If your basement is very damp, use wooden crates and plenty of wood shavings to help move air around the roots. If your storage area is extremely dry, like a heated utility room, you may need to check the rhizomes more frequently to ensure they aren't shriveling.

Mid-Winter Maintenance

Storing your cannas is not a "set it and forget it" task. For the best results, you should check on your "babies" about once a month. This small effort can save your entire collection from a single bad apple.

Open the boxes and feel a few of the rhizomes. They should still feel firm, like a fresh potato. If you find one that feels soft, mushy, or smells bad, remove it immediately and discard it. This prevents the decay from spreading to the healthy rhizomes.

If the rhizomes feel very light and look wrinkled or shriveled, they are losing too much moisture. You can lightly mist the packing medium with a spray bottle of water. Do not soak it; you just want to add a tiny hint of humidity back into the air. Most of the time, however, it is better to keep them a little too dry than a little too wet.

Dividing Your Cannas

One of the most exciting parts of growing cannas is how much they multiply. A single rhizome planted in May can turn into a massive clump by October. You can choose to divide these clumps either in the fall before you store them or in the spring before you plant them.

Many gardeners prefer to wait until spring to do the actual cutting. This is because the "eyes" are much easier to see when the plant is starting to wake up. However, if your clumps are simply too large to fit into your storage boxes, you can break them into smaller pieces in the fall. If you want a ready-made mix for next season, take a look at the Canna Assorted Collection.

When dividing, make sure each piece has at least one or two prominent eyes. Use a clean, sharp knife to make the cuts. If you divide them in the fall, let the cut surfaces dry and "callous over" for an extra day before packing them in the medium. This protects the open wound from infection.

Storing Container-Grown Cannas

If you grow your cannas in large pots or decorative containers, you have a shortcut available. You do not necessarily have to dig the rhizomes out of the soil.

Once the first frost hits, cut the foliage back to the soil level just as you would for garden-planted cannas. Move the entire pot into a cool, dark, frost-free location like a basement or garage. Stop watering the pot completely. The soil will dry out, and the rhizomes will go dormant right where they are.

In the spring, you can pull the clump out of the pot, refresh the soil, divide the rhizomes if they have become crowded, and start watering them again. This is the easiest way to store cannas if you have the floor space for the heavy pots.

Moving from Storage to Spring Planting

As the winter begins to fade, your cannas will sense the change. About 4 to 6 weeks before the last expected frost in your area, you can bring the boxes out of storage.

This is a great time for a final inspection. Discard any that didn't make it through the winter. You can start your rhizomes indoors in pots if you want an early start on the season, or you can wait and plant them directly in the ground once the soil has warmed to at least 60°F.

At Longfield Gardens, we recommend waiting until the danger of frost has completely passed before moving them outside. Cannas love warm soil and bright sun. Once the conditions are right, they will grow rapidly, rewarding your winter efforts with a spectacular display of tropical color. If you are planning your shipping window, review our Shipping Information.

Final Checklist for Success:

• Dig after the first frost but before the ground freezes.
• Cure the rhizomes for 3 to 7 days in a dry spot.
• Store in breathable containers with peat moss or wood shavings.
• Keep the temperature between 40°F and 50°F.
• Check monthly for rot or extreme shriveling.

Conclusion

Storing canna lily bulbs is one of the easiest ways to ensure your garden remains beautiful year after year without a large investment. While it requires a few steps, the process is simple enough for gardeners of any skill level to master. By following the natural cycle of the plant—waiting for the frost, curing the roots, and providing a cool, dark winter home—you are working in harmony with nature to preserve these tropical treasures.

We hope this guide makes your autumn garden chores feel like a rewarding part of the growing cycle. With a little care and the right storage conditions, your cannas will return each year bigger, stronger, and more beautiful than the last.

• Wait for the "frost signal" before you start your harvest.
• Prioritize airflow and cool temperatures during the winter months.
• Don't be afraid to divide your plants to share with friends and neighbors.

Ready to plan your next garden? We invite you to explore our selection of premium flower bulbs and perennials at Longfield Gardens to find the perfect companions for your canna lilies. Start with our Canna Tall collection, or browse our garden essentials for more seasonal planning help.

"The secret to a beautiful spring garden often lies in the care we provide during the quiet months of winter."

FAQ

Should I wash the dirt off my canna bulbs before storing them?

While you can use a hose to rinse away heavy clay soil, it is usually better to simply shake or brush off the loose dirt. Excess moisture can get trapped in the nooks and crannies of the rhizome, which increases the risk of rot. If you do wash them, ensure they have at least a full week to dry completely during the curing phase before you pack them away.

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

If the ground freezes solid before you dig, the moisture inside the fleshy rhizomes may freeze and expand, which destroys the plant tissue. Once the rhizomes thaw, they often turn into a mushy, rotten mess. If you suspect your rhizomes have frozen, dig one up and squeeze it; if it is soft and watery rather than firm, it likely won't survive the winter. If you need a quick reminder of product timing and delivery details, check our Shipping Information.

Can I store canna rhizomes in the refrigerator?

A refrigerator is generally too cold and too humid for long-term canna storage. Most refrigerators are kept around 35°F to 38°F, which can stress the tropical rhizome. Additionally, the lack of airflow in a crisper drawer often leads to mold. A cool basement or an attached garage is a much safer environment for their dormancy. If you want another storage-friendly option for next season, see the Canna Medium The President.

How do I know if my stored cannas are still alive in the spring?

Healthy cannas should feel firm and heavy when you take them out of storage. Look for the "eyes" or small white or pinkish buds on the surface of the rhizome. If you aren't sure, you can place them in a pot with slightly damp soil in a warm room; if they are alive, they will usually send up a sprout within two to three weeks. For a fresh start in the garden, you can also choose Canna Tall Tropicanna or explore our canna care guide.

For peace of mind before you buy, read about our 100% Quality Guarantee.