Introduction
The vibrant, tropical flair of canna lilies is one of the highlights of the summer garden. With their lush foliage and bold, orchid-like flowers, they transform any backyard into a private island getaway. One of the most rewarding parts of growing these beauties is knowing that you can enjoy them year after year. Because they are tender perennials, many gardeners look forward to the simple fall ritual of tucked-away storage to keep them safe for next spring.
At Longfield Gardens, we believe that gardening should be a relaxing and successful journey. Part of that success comes from understanding the natural rhythm of your plants. For cannas, that means knowing exactly when to transition them from their summer spotlight to their winter rest. This guide is designed for home gardeners who want to clear the guesswork out of the autumn harvest.
We will cover the specific visual cues to look for, how local weather patterns dictate your schedule, and the best practices for lifting these rhizomes safely. By following these steps, you can ensure your cannas remain healthy and ready to burst back into growth when the warm weather returns. Knowing when to pull canna lily bulbs is the first step toward a beautiful, repeatable summer display.
The Best Time to Pull Canna Lily Bulbs
The most common question gardeners ask is whether they should dig up their cannas before or after the first frost. The ideal time to pull canna lily bulbs—which are technically called rhizomes—is shortly after the first light frost of the autumn season. While you can dig them up earlier if your schedule requires it, waiting for that first nip of cold weather provides a few distinct benefits for the plant.
When the temperatures drop and a light frost touches the leaves, the foliage will typically turn brown or black and begin to wilt. This is a clear signal from nature that the plant is entering its dormant phase. This "blackening" of the leaves tells the plant to stop sending energy upward and start storing it in the underground rhizomes. This stored energy is exactly what the plant needs to produce those spectacular blooms next summer.
If you live in a region where frosts are rare or late, you can also look for yellowing foliage as a sign that the growing season is winding down. The goal is to lift the rhizomes before the ground actually freezes. A frozen crust on the soil can make digging difficult and may damage the tender tissues of the rhizomes. Aim for a window of time between the first frost and the first hard freeze of the season.
Key Takeaway: Wait for the first light frost to blacken the foliage before digging. This allows the plant to store maximum energy for next year's growth.
Identifying the First Frost Signal
A "light frost" usually occurs when temperatures dip just below 32°F for a short period. You will notice the once-sturdy canna leaves looking limp and darker in color. Do not be alarmed by this change; it is a natural part of the plant's life cycle. Once the leaves are no longer green and productive, they are no longer feeding the plant, making it the perfect time to begin the lifting process.
Why Timing Matters
Lifting too early—while the leaves are still vibrant and green—isn't a disaster, but it does cut the growing season short. The longer the leaves stay green, the more "food" the rhizome can store. Conversely, waiting too long after the ground has frozen solid can lead to rot or tissue damage. By watching the weather forecast and reacting to the first frost, you hit the "sweet spot" for plant health.
Understanding Your Hardiness Zone
Whether or not you need to pull your canna lilies depends largely on where you live. Canna lilies are tropical plants that thrive in heat, but they are sensitive to sustained freezing temperatures in the soil. At Longfield Gardens, we recommend checking your USDA hardiness zone to determine if your cannas can stay in the ground or if they need to spend the winter indoors.
- Zones 8 to 11: In these warmer climates, canna lilies are generally considered hardy. You can leave them in the ground year-round. Many gardeners simply cut the stalks back to the ground in late autumn and apply a light layer of mulch to keep things tidy.
- Zone 7: This is the "borderline" zone. In many years, cannas will survive a Zone 7 winter if they are planted in a protected spot or covered with a thick layer of mulch (about 6 inches of straw or shredded leaves). However, if an unusually cold winter is predicted, pulling them is the safest bet.
- Zones 3 to 6: In these regions, the ground freezes deep enough to reach the rhizomes. To save your cannas, you must pull them every fall. Treat this as an opportunity to divide your plants and expand your garden for free, as cannas multiply throughout the summer.
The Role of Microclimates
Sometimes, your specific yard might be slightly warmer than the official zone rating. A south-facing garden bed against a brick wall, for example, might stay warm enough to keep cannas safe even in a colder zone. However, for most gardeners in the northern half of the US, lifting the bulbs is a simple and reliable insurance policy against the winter cold.
Preparing to Dig Your Cannas
Once the frost has signaled it is time to move, you will want to prepare the plants for their winter nap. This makes the digging process much easier and keeps your storage area cleaner.
Cutting Back the Foliage
Start by cutting the stalks down. Use a clean pair of garden shears or a sharp knife to cut the stems to about 2 to 4 inches above the soil line. Removing the bulky, wilted foliage first allows you to see exactly where the base of the plant is. This prevents you from accidentally slicing into the rhizomes with your shovel.
Gathering Your Tools
You don't need specialized equipment for this task. A sturdy garden spade or a digging fork is ideal. A digging fork is often preferred because it is less likely to slice through a rhizome if you misjudge the distance. You will also want a pair of gardening gloves and a container—like a wheelbarrow or a garden trug—to hold the clumps as you move them to your cleaning station.
What to Do Next: Preparation Checklist
- Check the 10-day forecast for the first frost.
- Locate your garden spade or digging fork.
- Trim stalks down to 2–4 inches once foliage turns dark.
- Clear away any decorative mulch from the base of the plants.
- Prepare a workspace in a garage or shed for cleaning and drying.
How to Lift Canna Rhizomes Safely
Lifting cannas is a straightforward process, but because the rhizomes are fleshy, they should be handled with a gentle touch. Think of them as being as delicate as a potato. Avoid tossing them or dropping them on hard surfaces, as bruises can lead to rot during the storage months.
Spacing Your Dig
Canna rhizomes grow horizontally and can spread significantly during a single summer. Start your digging about 6 to 12 inches away from the base of the stalks. By giving the plant plenty of "elbow room," you ensure that the spade goes under the root mass rather than through it.
The Lifting Motion
Insert your spade or fork deeply into the soil at an angle, then gently pry upward. Work your way around the entire clump, loosening the soil as you go. Once the soil is loose all the way around, you can usually lift the entire mass out of the ground by grasping the short remaining stalks. If the clump is very large and heavy, don't be afraid to break it into two or three smaller pieces while it is still in the ground to make it more manageable.
Removing Excess Soil
Once the clump is out of the ground, give it a gentle shake to remove large clods of dirt. You can also use your hands to brush away the loose soil. It is not necessary to get them perfectly clean at this stage, but removing the bulk of the garden soil will help the drying process go faster.
Key Takeaway: Dig wide and deep to avoid damaging the rhizomes. A gentle lift is better than a forceful pull.
Cleaning and Curing for Success
Before cannas go into storage, they need a short period of "curing." Curing is simply a fancy word for letting the outer skin of the rhizome dry out slightly. This helps prevent mold and rot once they are tucked away in a box or bag.
To Wash or Not to Wash?
There are two schools of thought on washing canna rhizomes. Some gardeners prefer to spray them down with a hose to remove all dirt. This makes it easier to see if there are any soft spots or pests. If you choose to wash them, you must be extra diligent about the drying process. Other gardeners prefer to let the soil dry and then gently brush it off. Both methods work well, provided the rhizomes are dry before final storage.
The Curing Process
Place your cleaned rhizomes in a well-ventilated area that is out of direct sunlight and protected from rain and frost. A garage, shed, or a covered porch works perfectly. Spread them out in a single layer on a piece of cardboard or a tray. Let them air dry for several days—up to a week is fine. During this time, the "wounds" where the stalks were cut or where rhizomes were separated will callus over, creating a protective barrier.
Dividing Your Cannas
Autumn is the perfect time to divide your cannas. Because these plants are vigorous growers, a single rhizome planted in the spring can often turn into a large cluster by October. Dividing them makes storage easier and gives you plenty of plants to share with neighbors or use in other parts of your yard.
Where to Make the Cut
Look for "eyes" on the rhizomes. These are small, rounded bumps that look a bit like the eyes on a potato. Each division needs at least one healthy eye to grow into a new plant next year, though keeping two or three eyes per piece is even better for a fuller display. You can usually snap the rhizomes apart by hand, or use a clean, sharp knife to cut them into sections.
Inspecting for Health
As you divide, keep an eye out for any rhizomes that feel mushy, look shriveled, or show signs of insect damage. It is best to discard these pieces now so they don't affect the healthy ones in storage. Healthy rhizomes should feel firm and heavy for their size.
Proper Winter Storage Conditions
The goal of winter storage is to keep the cannas in a state of suspended animation. You want them to stay cool enough to remain dormant, but warm enough that they don't freeze. You also need to maintain a tiny bit of moisture so they don't dry out completely, while ensuring enough airflow to prevent rot.
Finding the Right Container
There are several easy ways to store your cannas:
- Cardboard Boxes: Line a box with a few inches of peat moss, vermiculite, or wood shavings. Place the rhizomes inside and cover them with more of the material.
- Paper Bags: Large grocery bags filled with shredded newspaper or peat moss are a great, low-cost option.
- Plastic Bins: If you use plastic totes, leave the lids slightly ajar or drill several small holes in the sides to allow for air circulation.
The Ideal Environment
The best temperature for storing cannas is between 45°F and 55°F. A cool basement, a crawl space, or a frost-free cellar is usually ideal. Avoid storing them near a furnace or in an attic that gets too hot, as the heat may cause them to sprout prematurely or shrivel up. Also, avoid unheated garages in very cold climates, as the rhizomes may freeze if the temperature inside the garage drops below 32°F.
Checking During the Winter
It is a good habit to check on your stored cannas once a month. If they look very shriveled, you can lightly mist the storage material (like the peat moss) with a bit of water. If you notice any soft or fuzzy spots starting to form on a rhizome, remove that piece immediately to protect the rest of the batch.
Getting a Head Start in the Spring
As the winter winds down, you can start looking forward to the return of your tropical garden. One of the joys of saving your own cannas is the ability to "wake them up" early. About 4 to 6 weeks before your last expected spring frost, you can bring your rhizomes into a warmer area.
Some gardeners choose to pot them up in containers and place them in a sunny window. This gives the plants a head start, so they are already several inches tall by the time the outdoor soil is warm enough for planting. This simple trick can lead to earlier blooms and a longer season of color.
When you finally move them outdoors, remember the "right plant, right place" rule. Cannas love full sun and rich, moist soil. Because you took the time to pull and store them correctly in the fall, they will reward you with a magnificent show of foliage and flowers all summer long.
Conclusion
Pulling canna lily bulbs is a simple and rewarding part of the gardening cycle. By waiting for the first frost to signal dormancy and following the easy steps of lifting, curing, and storing, you can preserve your favorite varieties for many years. This practice not only saves money but also allows you to watch your garden grow and expand as the rhizomes multiply each season.
We at Longfield Gardens hope this guide gives you the confidence to enjoy these tropical treasures in your own backyard, regardless of your climate. Gardening is all about the joy of the journey, and there is nothing quite like the satisfaction of seeing your own overwintered cannas peek through the soil once again in the spring.
- Wait for the frost: Let the first light frost blacken the leaves before you dig.
- Cure before storing: Give the rhizomes a few days to air dry in a protected area.
- Store cool and dry: Aim for a temperature range of 45–55°F in a breathable container.
- Check monthly: A quick inspection ensures your cannas stay healthy all winter long.
For the most beautiful results next season, keep your stored rhizomes in a cool, dark place and wait until the spring soil is consistently warm before replanting them in a sunny spot.
FAQ
Can I leave canna lilies in the ground over winter?
Whether you can leave them in the ground depends on your USDA hardiness zone. In zones 8 and warmer, cannas are generally hardy and can stay in the soil with a light layer of mulch. In zone 7, they may survive with heavy mulching, but in zones 6 and colder, the ground freezes deep enough to kill the rhizomes, so they must be pulled and stored indoors.
Do I need to wash the dirt off the canna rhizomes before storing?
It is not strictly necessary to wash them, though some gardeners find it helpful for inspecting the health of the rhizome. If you do wash them, ensure they are allowed to dry completely for several days in a ventilated area before putting them into storage. If you prefer not to wash them, simply shake off the loose clods and let the remaining soil dry before brushing it away gently.
What happens if I dig up my cannas before the first frost?
Digging cannas before the first frost is perfectly fine and will not harm the plant. Many gardeners choose to do this if they need to clear their garden beds early or if they expect a busy autumn schedule. However, waiting for the frost allows the plant to naturally enter dormancy and store as much energy as possible in the rhizomes for the following year's growth.
How do I know if my stored canna rhizomes are still good?
Healthy rhizomes should feel firm and relatively heavy, similar to a fresh ginger root or a potato. If a rhizome feels very light, hollow, or mushy, it has likely dried out too much or begun to rot. During your monthly winter checks, look for these signs and discard any damaged pieces to ensure they don't spread rot to the healthy ones.
