Table of Contents
- Introduction
- Understanding Canna Rhizomes
- Do You Need to Dig Your Cannas?
- When to Start the Winter Harvest
- How to Dig Canna Rhizomes Without Damage
- Cleaning and Curing: The Secret to Long-Term Storage
- Should You Divide Your Cannas in the Fall?
- Choosing the Best Storage Container and Medium
- Finding the Right Winter Home
- Checking on Your Cannas During Winter
- Moving Cannas Back Outdoors
- Conclusion
- FAQ
Introduction
There is something truly special about the way canna lilies transform a summer garden. With their tropical, oversized foliage and vibrant blooms in shades of red, orange, and yellow, they bring a sense of lush energy to any landscape. The best part is that you do not have to say goodbye to these stunning plants when the weather turns cold. Saving your canna rhizomes is a rewarding way to grow your collection year after year. (longfield-gardens.com)
At Longfield Gardens, we enjoy seeing how these plants grow larger and more impressive each season. Storing canna lilies over winter is a straightforward process that any gardener can master. Whether you are a beginner or a seasoned pro, taking a little time in the fall ensures your garden will be ready to glow again next summer. This guide is for anyone who wants to preserve their favorite varieties and enjoy the satisfaction of a successful "fall harvest." (longfield-gardens.com)
By following a few simple steps, you can keep your cannas safe from freezing temperatures and ready for a head start in the spring. Check your USDA hardiness zone before you decide whether your plants can stay in the ground. (longfield-gardens.com)
Understanding Canna Rhizomes
Before we jump into the "how-to" of storage, it helps to understand what we are actually storing. While many people refer to them as bulbs, cannas actually grow from rhizomes. A rhizome is a thick, fleshy horizontal stem that grows underground. It acts as a storage tank for the plant, holding all the energy and nutrients needed to sprout new leaves and flowers the following year. (longfield-gardens.com)
The beauty of cannas is their ability to multiply. If you planted one small rhizome in the spring, you will likely find a large, heavy clump when you dig it up in the fall. These rhizomes are tough, but because they are tropical in origin, they cannot survive being frozen. Their high water content makes them susceptible to damage if the ground turns to ice. (longfield-gardens.com)
Storing them over the winter is simply a way of mimicking their natural dormant cycle in a controlled, frost-free environment. It is a process of hitting the "pause" button on their growth until the sun returns and the soil warms up again. For more background on varieties and uses, see our cannas blog category. (longfield-gardens.com)
Do You Need to Dig Your Cannas?
Whether or not you need to dig your canna lilies depends entirely on your location and your local climate. Most cannas are hardy in USDA zones 8 through 10. If you live in these warmer regions, your plants can often stay in the ground year-round. (longfield-gardens.com)
Zones 8 and Warmer
In these areas, the ground rarely freezes deep enough to reach the rhizomes. You can simply cut the foliage back to the ground after it turns brown in the fall. Adding a few inches of mulch, like shredded leaves or straw, provides an extra layer of protection and keeps the soil moisture consistent. (longfield-gardens.com)
Zone 7
This is the "bridge" zone. In many years, cannas will survive a zone 7 winter if they are planted in a protected spot, such as near a south-facing wall of a house. However, a particularly harsh winter can still be a risk. Many gardeners in zone 7 choose to dig up their prized varieties just to be safe, or they apply a very thick layer of mulch (6 to 8 inches) to insulate the soil. (longfield-gardens.com)
Zones 3 to 6
In these cooler climates, canna rhizomes must be dug up and stored indoors. The frozen ground will quickly turn the fleshy rhizomes into mush. While it takes a little extra effort, the reward is having mature, large-scale plants every summer without having to purchase new ones. (longfield-gardens.com)
Key Takeaway: If your ground freezes solid in the winter, your cannas need to come inside. Check your USDA hardiness zone to determine if your local winter is mild enough for them to stay outdoors. (longfield-gardens.com)
When to Start the Winter Harvest
Timing is everything when it comes to storing cannas. You want to give the plants as much time as possible to store energy in their rhizomes, but you must get them out of the ground before the soil itself freezes. (longfield-gardens.com)
The best signal for harvest is the first light frost of autumn. When a light frost hits, the foliage of the canna lily will turn brown or black and begin to wilt. This is not a cause for alarm; it is actually a helpful signal. The frost tells the plant that the growing season is over and it is time to move into dormancy. (longfield-gardens.com)
If you live in an area where frost comes very late, you can simply wait until late October or early November. Even if the leaves are still green, the cooling soil temperatures will naturally slow the plant’s growth. (longfield-gardens.com)
Try to choose a dry, sunny day for your digging. Dry soil is much easier to shake off the rhizomes than heavy, wet mud. If the forecast calls for a week of heavy rain, it is often better to dig them a few days early while the soil is still manageable. (longfield-gardens.com)
How to Dig Canna Rhizomes Without Damage
The goal during harvest is to lift the rhizomes out of the ground while keeping them as intact as possible. Wounds or deep nicks in the fleshy skin can create openings for rot during storage. (longfield-gardens.com)
Prepare the Foliage
Start by cutting the stalks down. Use a sharp pair of garden shears or a lopper to cut the stems about 2 to 4 inches above the soil line. This "handle" makes it easier to see where the plant is and gives you something to hold onto while you move the clumps. (longfield-gardens.com)
Loosen the Soil
Cannas have a surprising spread. Their rhizomes grow outward, so avoid digging too close to the main stem. Use a garden spade or a sturdy digging fork. Start about 10 to 12 inches away from the base of the plant and dig a circle all the way around the clump. (longfield-gardens.com)
Lift Carefully
Insert your spade deeply under the clump and gently pry upward. Work your way around the circle until the entire mass of soil and rhizomes feels loose. Lift the clump from the bottom rather than pulling on the stems, which can snap off the growing points. (longfield-gardens.com)
Clean the Clump
Once the clump is out of the ground, gently shake it to remove large chunks of soil. You do not need to get them perfectly clean yet. Many gardeners find that using their hands to pull away loose dirt is safer than hitting the clump with a tool. (longfield-gardens.com)
What To Do Next:
- Cut the stems down to 3 inches.
- Dig a wide circle around the plant to avoid slicing the rhizomes.
- Lift the clump from underneath with a spade or fork.
- Shake off the loose soil gently by hand.
Cleaning and Curing: The Secret to Long-Term Storage
One of the most important steps in storing cannas is the "curing" process. Curing allows the outer skin of the rhizome to dry and toughen up slightly, which creates a natural barrier against rot and dehydration. For more canna care tips, visit our canna care articles. (longfield-gardens.com)
To Wash or Not to Wash?
There are two schools of thought on washing cannas. Some gardeners prefer to rinse the rhizomes with a hose to remove all soil. This makes it easier to spot pests or soft spots. Others prefer to let the soil dry and then brush it off. Both methods work well. If you do wash them, be sure they have plenty of time to dry completely before you pack them away. Moisture trapped against the skin is the primary cause of mold during the winter. (longfield-gardens.com)
The Drying Period
Spread your rhizomes out in a single layer in a well-ventilated area that is protected from rain and frost. A garage, a covered porch, or a shed works beautifully. Let them air dry for several days, up to a week. (longfield-gardens.com)
As they dry, any remaining soil will become crumbly and easy to brush away. You will also notice the cut ends of the stems starting to dry out and seal over. This is exactly what you want to see. (longfield-gardens.com)
Inspect for Health
Before packing them into boxes, take a close look at each clump. Firm rhizomes are healthy rhizomes. If you find any parts that feel soft, mushy, or smell sour, trim those pieces away with a clean knife. Healthy rhizomes should feel heavy for their size, similar to a fresh potato. (longfield-gardens.com)
Should You Divide Your Cannas in the Fall?
As you look at your large clumps of cannas, you might be tempted to break them into smaller pieces right away. While you certainly can divide them in the fall, many experts recommend waiting until the spring. If you plan to shop for more, the Canna Medium The President is a classic starting point. (longfield-gardens.com)
Waiting until spring has a major advantage: the "eyes" or growing points become much easier to see. These eyes look like small, swollen bumps on the surface of the rhizome, much like the eyes on a potato. In the spring, these bumps may even start to show a little bit of green or pink color. (longfield-gardens.com)
If the clumps are simply too large to handle or store in your available space, you can break them into smaller sections in the fall. Just ensure each section has at least two or three healthy rhizomes joined together. The more energy a piece has, the faster it will grow when you plant it again. (longfield-gardens.com)
Choosing the Best Storage Container and Medium
Once your rhizomes are clean and dry, it is time to pack them for their winter nap. The goal is to keep them in a "goldilocks" state: not too wet (which causes rot) and not too dry (which causes shriveling). If you want a broader shopping starting point, browse our cannas collection or Tall Cannas. (longfield-gardens.com)
Storage Media Options
Most gardeners use a packing material to help regulate moisture. Here are the most common choices:
- Peat Moss: This is a favorite because it holds a tiny bit of moisture but stays very light and airy.
- Wood Shavings: The kind used for pet bedding (like pine shavings) is excellent. It is inexpensive and provides great insulation.
- Vermiculite or Perlite: These are clean, lightweight options that provide excellent aeration.
- Newspaper: If you do not have loose material, you can wrap individual rhizomes in several layers of dry newspaper.
Containers
You want a container that allows for a small amount of air circulation. Cardboard boxes are an excellent choice because the paper "breathes." Plastic storage totes can also work, but you should leave the lid slightly ajar or drill a few small holes in the sides to prevent moisture from building up inside. (longfield-gardens.com)
Packing the Boxes
Start with a two-inch layer of your chosen storage medium at the bottom of the box. Place a layer of rhizomes on top, making sure they are not touching each other. Cover them with more material and repeat the process until the box is full. Finishing with a thick layer of peat moss or shavings on top helps protect them from temperature fluctuations. (longfield-gardens.com)
Finding the Right Winter Home
The location where you store your boxes is just as important as how you pack them. Cannas need a spot that stays consistently cool but never reaches freezing. For shipping details and timing by zone, see our shipping information. (longfield-gardens.com)
The ideal temperature range is between 45°F and 55°F. If the area is too warm (above 60°F), the rhizomes may try to start growing prematurely or may dry out too quickly. If it drops below 40°F, they risk being damaged by the cold. (longfield-gardens.com)
Common storage locations include:
- Unheated basements
- Crawl spaces
- Cool closets in a hallway
- An insulated garage (if it stays above freezing)
Keep the boxes in a dark place. Darkness helps keep the plants in their dormant state, preventing them from sending out weak, pale sprouts before it is time to go outside. (longfield-gardens.com)
Checking on Your Cannas During Winter
Storage is not a "set it and forget it" task. It is a good idea to check on your rhizomes about once a month. This small effort can save your entire collection if a problem starts to develop. You can also browse the broader Learn pages for more seasonal gardening help. (longfield-gardens.com)
Open your boxes and feel a few of the rhizomes.
- If they feel soft or mushy: Remove the affected piece immediately so the rot does not spread to the healthy ones.
- If they look shriveled or feel very light: They are losing too much moisture. Use a spray bottle to lightly mist the packing material (not the rhizomes themselves) with a little bit of water. You want the material to feel barely damp, like a wrung-out sponge, not wet. (longfield-gardens.com)
Most canna varieties, such as the classic red Canna Tall Tropicanna or the strikingly striped Canna Tall Tropicanna Black, are quite resilient. A quick monthly check is usually all they need to stay in top shape until spring. (longfield-gardens.com)
Moving Cannas Back Outdoors
When the days start to get longer and the threat of frost passes, it is time to wake up your cannas. This usually happens in late April or May, depending on your local climate. For more timing guidance, the hardiness zone map and shipping information pages can help you plan ahead. (longfield-gardens.com)
The Spring Inspection
Take the rhizomes out of their boxes and give them a final check. They should still be firm. If you see small sprouts beginning to emerge from the eyes, that is a great sign! (longfield-gardens.com)
Dividing for More Plants
If you didn't divide them in the fall, now is the perfect time. Use a clean, sharp knife to cut the clumps into sections. Make sure each section has at least two or three healthy eyes. Let the cut ends dry for a day before planting to prevent soil-borne diseases from entering the fresh cuts. (longfield-gardens.com)
Starting Early Indoors
If you want flowers as early as possible, you can "pot up" your cannas indoors about 4 to 6 weeks before the last frost. Plant the rhizomes in large pots with potting soil and place them in a sunny window. By the time the weather is warm enough to move them to the garden, you will already have several inches of lush green growth. For more inspiration, browse the Canna care articles and related guides. (longfield-gardens.com)
Planting in the Garden
Wait until the soil has warmed up and all danger of frost is gone before planting directly into the garden. Cannas love sun and water. Choose the sunniest spot you have and tuck the rhizomes about 4 inches deep into the soil. With a little water and warmth, they will quickly transform into the tropical stars of your summer landscape. If you want a curated mix, the Canna Assorted Collection is a ready-made option. (longfield-gardens.com)
Key Takeaway: Spring is the time for a fresh start. Inspect, divide, and optionally pot up your cannas to give them a head start on the growing season. (longfield-gardens.com)
Conclusion
Storing canna lily bulbs over winter is one of the most rewarding tasks in the garden calendar. It turns a single season of beauty into a lifetime of tropical color. By following the simple steps of digging, curing, and storing in a cool, dry place, you ensure that your garden remains vibrant year after year. (longfield-gardens.com)
At Longfield Gardens, we believe that gardening should be a source of joy and relaxation. Taking care of your cannas during the winter months is a wonderful way to stay connected to your garden even when the ground is covered in snow. When you see those first green shoots emerge in the spring, you will know that your efforts were well worth the wait. If you want to keep exploring, our Learn hub is a good next stop. (longfield-gardens.com)
Next Steps for Winter Success:
- Mark your calendar: Set a reminder for the first frost in your area.
- Gather supplies: Have cardboard boxes and peat moss or wood shavings ready to go.
- Check the storage spot: Use a thermometer to ensure your basement or garage stays in the 45-55°F range.
Your future garden is resting quietly in those boxes, waiting for the return of the sun. With just a little bit of care, your cannas will be back and better than ever next summer. (longfield-gardens.com)
FAQ
When is the best time to dig up my canna lily rhizomes?
The ideal time to dig cannas is shortly after the first light frost of the autumn has killed the foliage. This frost acts as a signal for the plant to enter its dormant phase. If a frost is not expected but the weather is becoming consistently cold, you can dig them in late October or early November. (longfield-gardens.com)
Do I have to wash the dirt off the rhizomes before storing them?
Washing is a personal preference. Some gardeners find that rinsing the rhizomes helps them identify any rot or pests, while others prefer to let the soil dry and simply brush it off. If you do choose to wash them, ensure they are completely dry before packing them away to prevent mold. (longfield-gardens.com)
How often should I check my stored cannas during the winter?
It is a good idea to check your stored rhizomes about once a month. Look for any signs of rot (mushiness) or extreme dehydration (shriveling). Remove any rotting pieces immediately, and if the rhizomes look too dry, lightly mist the packing material with a bit of water. (longfield-gardens.com)
Can I store my canna lilies in a garage?
A garage can be an excellent storage spot as long as it is insulated and the temperature stays consistently between 45°F and 55°F. The most important thing is to ensure the temperature never drops below freezing, as this will kill the tropical rhizomes. If your garage gets very cold, a basement or crawl space might be a safer choice. (longfield-gardens.com)