Table of Contents
- Introduction
- Understanding How Canna Lilies Grow
- Does My Climate Allow Cannas to Grow Back?
- How to Help Your Canna Lily Grow Back
- What to Expect in the Spring
- How to Tell if Your Canna is Still Alive
- Growing Tips for Best Returns
- Safety and Practicality
- Conclusion
- FAQ
Introduction
The sight of a canna lily in full bloom is one of the true highlights of a summer garden. These plants bring a bold, tropical energy to any landscape with their oversized leaves and vibrant, torch-like flowers. Because they look so exotic, many gardeners worry that they are too delicate to survive more than one season. The good news is that these plants are actually quite resilient. Whether you live in a warm climate or a region with snowy winters, you can enjoy these stunning blooms year after year with just a little bit of care.
At Longfield Gardens, we want to help you feel confident in your garden and enjoy the rewards of your hard work. Watching your favorite plants return each spring is one of the most satisfying parts of gardening. This guide will explain exactly how cannas grow, how to manage them during the winter, and what you can do to ensure they return even stronger next season. With the right approach to winter care and a bit of spring patience, your canna lilies can grow back beautifully for many years to come. If you're planning ahead for an order, our Shipping Information page can help you understand when your plants will arrive.
Understanding How Canna Lilies Grow
To understand if your canna lily will grow back, it helps to know how the plant functions beneath the soil. Canna lilies are herbaceous perennials. This means their foliage dies back to the ground when temperatures drop, but the energy remains stored in their underground root system.
The Role of the Rhizome
The "engine" of a canna lily is its rhizome. A rhizome is a thick, fleshy underground stem that looks a bit like ginger root. This structure acts as a battery, storing all the energy the plant needs to survive dormancy and push out new growth when the weather warms up.
When you see a canna lily "growing back," it isn't usually regrowing from the old, cut stalks. Instead, the rhizome produces new shoots from "eyes" or growth nodes. If the rhizome stays healthy and firm during the winter, it has everything it needs to send up brand-new stems in the spring.
Herbaceous Perennial Patterns
In their native tropical environments, cannas might grow year-round. However, in most parts of the United States, they follow a seasonal cycle. They grow vigorously in the heat of summer, bloom through the fall, and then go dormant as the days shorten and temperatures cool. This dormancy is a natural and healthy part of the plant's life. As long as the rhizome does not freeze or rot during this period, the plant is biologically designed to return.
Key Takeaway: Canna lilies grow back from underground rhizomes, not from their old stems. As long as the rhizome remains healthy through winter, the plant will produce new shoots in the spring.
Does My Climate Allow Cannas to Grow Back?
The answer to "will my canna lily grow back" depends heavily on your local weather. Because they are tropical plants, they are sensitive to extreme cold. Your USDA hardiness zone is the best tool for determining how you should care for them over the winter.
Growing Back in Warm Climates (Zones 7-11)
If you live in USDA zones 8 through 11, your canna lilies are generally considered hardy. In these regions, the ground usually does not freeze deep enough to damage the rhizomes. In zone 7, they often survive with a little extra help.
In these warmer areas, you can simply leave the rhizomes in the ground. The foliage will turn brown and die back after a frost, which is perfectly normal. Once the leaves have withered, you can cut the stems down to about four inches above the soil. To give them the best chance of returning, apply a thick layer of mulch—about four to six inches of straw, wood chips, or shredded leaves—over the planting area. This mulch acts like a blanket, keeping the soil temperature stable.
Growing Back in Cold Climates (Zones 3-6)
In zones 3 through 6, the winter frost reaches deep into the soil. If canna rhizomes are left in the ground in these zones, the water inside them will freeze, causing the cells to burst. This leads to mushy, rotten rhizomes that cannot grow back.
However, this does not mean you have to treat them as annuals. You can "lift" the rhizomes and store them indoors. By protecting them from the freezing cold, you effectively pause their growth until spring. We see many gardeners in the north successfully keeping the same canna plants for a decade or more by using this simple storage method.
How to Help Your Canna Lily Grow Back
If you live in a cold climate, or if you simply want to ensure your plants return as healthy as possible, following a few steps in the fall is essential. Here is how we recommend preparing your cannas for their winter rest.
Step 1: Handling the First Frost
Wait for the first light frost of the season before you take action. You will know it has happened when the lush green or bronze leaves of your canna turn black or dark brown. This frost sends a signal to the plant that it is time to go dormant and move its energy down into the rhizome.
Don't worry—a light frost won't hurt the rhizomes underground. It actually helps the plant prepare for storage. Once the foliage has died back, cut the stems down to about three to six inches above the soil level.
Step 2: Lifting the Rhizomes
Gently dig up the rhizome clumps. It is best to use a garden fork or a spade and start digging about a foot away from the center of the plant. This helps you avoid slicing into the fleshy rhizomes. Carefully lift the entire clump out of the soil.
You may be surprised by how much they have grown! Cannas are vigorous, and a single rhizome planted in the spring often turns into a large, heavy cluster by autumn. This multiplication is a great bonus, as it means you will have even more plants next year.
Step 3: Cleaning and Preparing
Shake off the excess soil, but you don't need to scrub them perfectly clean. Avoid washing them with a hose, as adding extra moisture right before storage can encourage rot. Let the clumps sit in a dry, shaded area (like a garage or a porch) for two or three days. This "curing" process allows the outer skin to toughen up slightly, which helps prevent the rhizome from drying out too much during the winter.
Step 4: Winter Storage Conditions
Place the rhizomes in a breathable container. Cardboard boxes, plastic bins with air holes, or even paper grocery bags work well. To keep the rhizomes from drying out completely, nestle them in a slightly damp medium. We find that peat moss, perlite, or wood shavings are excellent choices. For a deeper walkthrough, see our guide on How to Care for Canna Bulbs.
Store the container in a cool, dark, and dry place where temperatures stay between 40°F and 50°F. An unheated basement, a crawl space, or a frost-free garage is usually ideal.
What to do next:
- Label your containers so you remember which variety is which.
- Check the rhizomes once a month during winter.
- If they look shriveled, lightly mist the storage medium with water.
- If you see any soft or moldy spots, cut those sections away and discard them.
What to Expect in the Spring
One of the most common reasons gardeners think their canna lily didn't grow back is that they give up on it too early. Cannas are "heat-seekers" and are often the last plants to wake up in the spring garden.
Waking Up Your Cannas
Cannas will not begin to grow until the soil is consistently warm. They generally wait until the soil temperature reaches at least 60°F. In many parts of the country, this doesn't happen until late May or even June.
If you planted your rhizomes in April and haven't seen green shoots by mid-May, don't panic. As long as the rhizome is firm to the touch, it is simply waiting for the right conditions. Once the heat of summer truly arrives, they will grow with incredible speed, often making up for their late start in just a few weeks.
Starting Early Indoors
If you have a short growing season and want to see blooms sooner, you can give your cannas a head start. About four to six weeks before the last expected frost, plant your stored rhizomes in pots using a standard potting mix. Place the pots in a warm, sunny window or under grow lights.
By the time the weather is warm enough to move them outside, you will already have several inches of growth. This method ensures that your canna lily "grows back" earlier in the season, providing a longer window of tropical color. If you're choosing a variety for height, Tall Cannas are a striking option.
Why Depth and Spacing Matter
When you put your cannas back into the garden, make sure you don't plant them too deep. A depth of about four inches is usually perfect. This allows the sun to warm the soil around the rhizome quickly, which triggers earlier growth. Give them plenty of space—at least two feet apart—as they will expand throughout the summer. Our article on How Deep Should Canna Bulbs Be Planted? explains the planting depth in more detail.
Key Takeaway: Patience is vital with cannas. They are slow starters that require warm soil to sprout, but they grow very quickly once the summer heat sets in.
How to Tell if Your Canna is Still Alive
If you are looking at a bare patch of dirt or a box of stored rhizomes and wondering "will my canna lily grow back," there are a few easy ways to check for life.
The Look and Feel of a Healthy Rhizome
A healthy canna rhizome should feel heavy and firm, much like a fresh potato. If you squeeze it, it should not give way or feel "squishy." The color is usually off-white, tan, or pinkish, depending on the variety.
The most promising sign of life is the presence of "eyes." These are small, rounded bumps or pointed tips on the surface of the rhizome. These are the dormant buds that will eventually become the leaves and flowers. Even if the rest of the rhizome looks a bit shriveled or ugly, a single firm, pink "eye" means the plant is alive and ready to grow.
Identifying Signs of Rot
If a rhizome feels light, hollow, or very soft, it has likely dried out too much or succumbed to rot. Rotting rhizomes often have a sour smell or may be covered in a blue or grey fuzzy mold.
If only a small portion of a large clump is soft, you can often save the plant. Use a clean knife to cut away the soft parts until you reach firm, healthy tissue. Let the cut end dry for a day before replanting. For more seasonal guidance, How Long Can Canna Bulbs Be Stored? is a useful reference.
Growing Tips for Best Returns
Getting your canna to grow back is the first step, but you also want it to thrive. These plants are "heavy feeders," meaning they need plenty of fuel to produce those massive leaves and flowers.
- Full Sun is Non-Negotiable: For the best regrowth and the most flowers, cannas need at least six to eight hours of direct sunlight. If they are in too much shade, they may grow back with leaves but fail to bloom.
- Water Correctly: Cannas love moisture. In fact, some varieties can even grow in the shallow edges of a pond. During the heat of summer, make sure they get a deep soaking at least once or twice a week.
- Fertilize for Success: Since cannas grow so much in a single season, they use up a lot of soil nutrients. Applying a balanced, slow-release fertilizer in the spring and again in mid-summer will help the rhizome store enough energy for the following year.
- Deadheading: When a flower stalk finished blooming, cut it back. This prevents the plant from putting energy into making seeds and instead redirects that energy back down into the rhizome for next year's growth.
Safety and Practicality
While canna lilies are a joy in the garden, it is worth noting that they can be tempting for curious pets. While not as highly toxic as some other garden lilies, they can cause digestive upset if eaten. It is always a good practice to keep your stored rhizomes out of reach of dogs and cats during the winter.
Additionally, remember that every garden is a little different. Your soil type, how much wind your yard gets, and the specific variety of canna you choose will all play a role in how the plant performs. Don't be afraid to experiment with one or two plants first to see how they handle your local conditions. If you want a smaller footprint, Short Cannas are a great place to start.
Conclusion
Canna lilies are some of the most rewarding plants you can add to your garden. They offer a massive visual impact for relatively little effort, and their ability to grow back year after year makes them a wonderful investment for your landscape. Whether you are tucking them in for the winter with a heavy layer of mulch or lifting them to store in your basement, the goal is the same: protecting that energy-filled rhizome so it can surprise you with new growth in the spring.
At Longfield Gardens, we take pride in providing high-quality rhizomes that are ready to hit the ground running. By following these simple steps for winter care and spring planting, you can build a collection of these tropical beauties that gets more impressive with every passing season. If you need a more detailed step-by-step on digging and storage, How to Dig Up and Store Canna Bulbs is a helpful next read.
- Check your zone: Determine if you need to lift your rhizomes or if they can stay in the ground.
- Wait for frost: Let the first frost trigger dormancy before cutting the plants back.
- Store cool and dry: If lifting, keep rhizomes in a frost-free spot with a little moisture.
- Be patient in spring: Give the soil time to warm up before expecting to see shoots.
"The secret to canna success isn't complicated; it's simply about protecting the rhizome from freezing and giving it plenty of heat and water once the sun returns."
Now that you know how easy it is to ensure your cannas return, why not try a few new varieties this season? Browse our collection of canna lilies to find the perfect colors and heights for your garden beds and containers. If you'd like even more winter-care detail, How to Winter Over Canna Lily Bulbs can help you through the off-season.
FAQ
How do I know if my canna lily rhizome is dead?
A dead rhizome will usually feel very light and hollow or extremely soft and mushy. If you squeeze it and it collapses or oozes moisture, it has likely rotted. Healthy rhizomes should feel firm and heavy, similar to a fresh potato, and should have visible "eyes" or small bumps on the surface.
When should I cut back my canna lilies in the fall?
It is best to wait until the first frost has blackened the leaves. This allows the plant to move as much energy as possible into the underground rhizome for winter storage. Once the foliage has died back, you can cut the stems down to about three to six inches above the ground level.
Can I leave my canna lilies in pots over the winter?
Yes, if you have a frost-free area like a garage or basement. You can simply cut the foliage back and move the entire pot indoors. Stop watering the pot and let the soil dry out so the rhizomes go dormant. In the spring, move the pot back outside and resume watering once the weather is warm.
Do canna lilies multiply every year?
Yes, canna lilies are very vigorous and their rhizomes naturally expand and multiply during the growing season. A single rhizome planted in the spring will often produce a large clump of several rhizomes by the fall. You can divide these clumps in the spring to create even more plants for your garden.