Introduction
Nothing transforms a garden into a lush, tropical oasis quite like the bold foliage and vibrant blooms of canna lilies. Whether you are looking to add height to your borders or create a striking focal point in a container, these plants deliver a high-impact look with surprisingly little effort. At Longfield Gardens, we want to make sure you feel confident choosing the right plants for your landscape and understanding exactly how they grow throughout the seasons.
A common question many gardeners ask is whether canna lilies are perennials that come back every year or annuals that need to be replaced. The answer depends largely on where you live and how you care for them during the winter months. This guide will clarify the lifecycle of these beautiful plants and help you decide the best approach for your specific garden.
By understanding the simple basics of canna lily growth, you can enjoy their exotic charm season after season. We will cover the difference between bulbs and rhizomes, how hardiness zones affect their survival, and the easy steps you can take to preserve them regardless of your climate. Canna lilies are a rewarding investment for any gardener looking for reliable summer color.
Understanding the Canna Lily Lifecycle
To answer the question of whether canna lilies are perennials, we first need to look at how they are classified botanically. Canna lilies are herbaceous perennials. In the world of gardening, a perennial is a plant that lives for more than two years. Unlike annuals, which complete their entire life cycle—from seed to flower to seed—in a single growing season, perennials are designed to persist.
However, the "perennial" label comes with a small caveat when it comes to tropical plants like cannas. Because they originated in the warm, humid regions of South and Central America, they have no natural defense against freezing temperatures. This makes them "tender perennials." In warm climates, they stay in the ground and grow larger each year. In cooler climates, they are often treated as annuals or "lifted" and stored indoors to mimic their native frost-free environment.
When you plant a canna, you are starting a cycle of growth that can last for many years. During the spring and summer, the plant focuses on producing its signature paddle-shaped leaves and bright flower spikes. As autumn approaches and temperatures drop, the plant begins to shift its energy downward. It stores nutrients in its underground structures to prepare for a period of rest, or dormancy.
Key Takeaway Canna lilies are naturally perennials, meaning they are capable of living for many years. Their ability to return each spring depends on the soil temperature and whether the underground rhizomes are protected from freezing.
Bulbs, Rhizomes, and How Cannas Grow
While many gardeners refer to "canna lily bulbs," these plants actually grow from something called a rhizome. Understanding this distinction is one of the most helpful things you can do for your garden success. A true bulb, like a tulip or an onion, is a self-contained underground storage organ made of fleshy scales. A rhizome, however, is actually a modified stem that grows horizontally under the soil surface.
If you look closely at a canna rhizome, you will see small bumps or points. These are called "eyes," much like the eyes on a potato. Each eye has the potential to sprout a new stem and a new set of roots. This growth habit is why cannas are so effective at filling in garden spaces. As the rhizome grows longer underground, it sends up more stalks, creating a thicker, more impressive clump of foliage over time.
This rhizomatous growth is also why cannas are so easy to multiply. Because they are perennials, the rhizomes continue to expand as long as the conditions are favorable. Every few years, you can simply divide these rhizomes to create entirely new plants for other parts of your yard or to share with neighbors. This makes them an incredibly cost-effective way to landscape a large area with premium color.
Why the Name "Lily" is Misleading
It is also helpful to know that canna lilies are not true lilies. True lilies belong to the Lilium genus and have very different growth requirements. Cannas are actually more closely related to ginger, bananas, and birds of paradise. This relationship explains why they love heat, plenty of water, and rich soil. When you treat them like the tropical cousins they are, they reward you with much more vigorous growth and more frequent blooming.
The Role of Hardiness Zones
Whether your canna lilies act as perennials in your garden depends almost entirely on your USDA Plant Hardiness Zone. These zones are based on the average minimum winter temperature in your area. Because canna rhizomes are full of moisture, they will turn to mush if the ground freezes solid around them.
Zones 8 to 11: Year-Round Perennials
If you live in USDA zones 8, 9, 10, or 11, you can treat canna lilies as reliable, permanent residents of your flower beds. In these warmer regions, the ground rarely freezes deep enough to damage the rhizomes.
In these areas, the foliage may die back to the ground after a light frost, but the rhizomes remain safe and dormant in the soil. All you need to do is cut the dead stalks back to about four inches above the soil line and perhaps add a light layer of mulch for extra protection. When the soil warms up again in the spring, new shoots will emerge from the eyes of the rhizomes, and the cycle begins again.
Zones 3 to 7: Tender Perennials or Annuals
For gardeners in zones 3 through 7, canna lilies require a bit more attention if you want them to return. In these regions, the winter frost goes deep into the soil. If left outdoors without protection, the rhizomes will likely perish.
Gardeners in these cooler zones have two choices:
- Treat them as annuals: Plant new rhizomes every spring and let them go at the end of the season. This is a great option for busy gardeners who love the look of cannas but don't want the extra chore of winter storage.
- Lift and store: Dig up the rhizomes in the fall, store them in a frost-free place like a basement or garage, and replant them the following spring. This allows you to keep your favorite varieties year after year.
Planting for Success: Right Place, Right Time
Because canna lilies are perennials that thrive on energy storage, the more successful their summer growth is, the better they will perform the following year. Getting the basics right at planting time ensures the rhizomes stay healthy and strong.
Timing is Everything
The most common mistake with cannas is planting them too early. Since they are tropical in nature, they need warm soil to begin growing. We recommend waiting until the danger of frost has completely passed and the soil temperature has reached at least 60°F. A good rule of thumb is to plant your cannas at the right time, at the same time you would plant your tomatoes or peppers.
Sun and Soil Requirements
To reach their full perennial potential, cannas need "fuel." This comes in two forms: sunlight and nutrients.
- Sun: Choose a spot that receives at least six to eight hours of direct sunlight. While they can grow in partial shade, they will produce fewer flowers and the foliage colors won't be as vivid.
- Soil: Cannas love rich, fertile soil. Before planting, we suggest mixing in some compost or well-rotted manure. They are also unique among many garden plants because they can handle "wet feet." While they grow fine in standard garden soil, they also thrive in damp areas near ponds or in rain gardens.
Proper Depth and Spacing
When planting your rhizomes, place them about 2 to 3 inches deep. Make sure the "eyes" are pointing upward. If you can't tell which side is up, don't worry—the plant will eventually figure it out, though it might take a little longer to break through the surface.
Space your cannas about 1 to 2 feet apart. Remember, because they are perennials, they will spread. Giving them enough room from the start prevents overcrowding and ensures good air circulation, which keeps the foliage looking its best.
What to Do Next
- Check your USDA hardiness zone to see if your cannas can stay in the ground.
- Wait for soil temperatures to hit 60°F before planting.
- Choose a sunny spot with rich, moist soil.
- Plant rhizomes 2-3 inches deep with eyes facing up.
Essential Care for Perennial Performance
Once your cannas are established, they are remarkably low-maintenance. However, a little consistent care during the summer helps the plant store the energy it needs to return as a perennial next year. For additional guidance, explore Longfield Gardens’ canna planting and care resources.
Water Correctly, Not Constantly
Cannas are thirsty plants. To keep their large leaves from wilting or getting "burnt" edges, they need consistent moisture. Instead of light daily sprinkles, give them a deep soaking once or twice a week. This encourages the roots to grow deeper, making the plant more resilient. If you are growing cannas in containers, they will dry out much faster than those in the ground, so check the soil moisture daily during the heat of summer.
Feeding Your Cannas
Because they grow so much biomass in a single season—some varieties can reach 6 to 8 feet tall—cannas are heavy feeders. We recommend using a balanced, slow-release fertilizer at planting time. You can follow this up with a monthly application of a water-soluble fertilizer during the peak growing months of July and August. This extra nutrition supports both the flowers you see now and the rhizome health you’ll need for next year.
The Importance of Deadheading
Deadheading is the process of removing spent flowers before they turn into seed pods. For canna lilies, this isn't just about keeping the garden looking tidy. When a plant produces seeds, it uses up a lot of energy. By snipping off the faded blooms, you redirect that energy back into producing more flowers and strengthening the rhizome.
Be careful when deadheading cannas. New flower buds often form just below the current bloom on the same stalk. Only cut the individual spent flower, or wait until the entire stalk has finished blooming before cutting the stalk back to the foliage.
How to Overwinter Cannas in Cold Climates
If you live in a zone where cannas are not winter-hardy, "lifting" them is a simple process that allows you to enjoy these perennials for a lifetime. This is often the most rewarding part of growing cannas, as you'll see how much the rhizomes have multiplied over the summer. For detailed instructions, see this guide to digging up and storing canna bulbs.
Step 1: Wait for the First Frost
There is no need to rush. In fact, it is better to wait until a light frost has blackened the foliage. This sends a signal to the plant that it is time to go dormant. Once the leaves have turned brown or black, cut the stems down to about 4 to 6 inches above the ground.
Step 2: Dig Carefully
Using a garden fork or shovel, gently loosen the soil in a circle about a foot away from the center of the plant. You want to avoid slicing into the rhizomes. Lift the entire clump out of the ground and gently shake off the excess soil.
Step 3: Cleaning and Curing
You don't need to scrub the rhizomes, but removing large clumps of dirt helps prevent rot. Let the rhizomes sit in a dry, shaded area (like a garage or porch) for a few days. This "curing" process allows the outer skin to toughen up slightly, which helps them stay hydrated during winter storage.
Step 4: Storage Conditions
Place the rhizomes in a box or plastic bin. We recommend layering them with slightly damp peat moss, perlite, or vermiculite. This provides just enough moisture to keep them from shriveling up without making them so wet that they mold. Store the container in a cool, dark place where temperatures stay between 40°F and 50°F. A crawl space, unheated basement, or insulated garage is usually perfect.
Winter Storage Checklist
- Wait for frost to blacken the leaves.
- Cut stems to 4 inches.
- Lift clumps carefully to avoid damage.
- Cure in a dry spot for 2-3 days.
- Store in peat moss at 40-50°F.
Choosing Varieties for Longevity
Not all cannas are the same, and choosing the right variety for your space makes the perennial experience much more enjoyable. At Longfield Gardens, we offer a selection that ranges from compact porch-dwellers to towering landscape giants.
Dwarf and Compact Varieties
If you have a smaller garden or prefer growing in pots, look for dwarf varieties. These typically stay between 2 and 3 feet tall. Because they are more compact, they are much easier to handle when it comes time to lift and store them for the winter. They also tend to start blooming earlier in the season because they don't have to spend as much time growing tall stalks. Browse short cannas for containers and small gardens.
Standard and Giant Varieties
For the back of a border or for creating a privacy screen, standard varieties (4-6 feet) and giant varieties (6+ feet) are the way to go. These plants produce massive, banana-like leaves that provide a lush texture even when the flowers aren't in bloom. Popular choices like 'Wyoming' offer dark, bronze foliage that contrasts beautifully with fiery orange flowers. Explore tall cannas for dramatic garden displays.
Foliage-Focused Cannas
While the flowers are stunning, many gardeners value cannas for their leaves. Varieties like 'Bengal Tiger' (also known as 'Pretoria') feature striking yellow and green striped leaves, while others offer deep burgundy or variegated patterns. These varieties ensure your garden looks like a tropical paradise from the moment the leaves unfurl until the first frost hits.
Common Questions and Realistic Expectations
Gardening is a journey, and while cannas are very reliable, your results will naturally vary based on your local microclimate and the weather each year.
One thing to keep in mind is that cannas can be slow to start in the spring. If you plant them and don't see anything for three weeks, don't worry. They are simply waiting for the soil to get warm enough. Once they start, they grow incredibly fast—sometimes several inches a week!
Another realistic expectation involves pests. While cannas are generally deer-resistant, they can sometimes attract "leaf rollers" (small caterpillars that roll themselves into the leaves). This is easily managed by keeping an eye on your plants and removing any affected leaves or using a simple organic treatment recommended by your local extension office.
Dividing Your Cannas
Because canna lilies are perennials, they will eventually become overcrowded. You will know it is time to divide them when you notice fewer flowers or if the clump is becoming too dense for water to reach the center. Every 3 to 5 years, simply cut the rhizomes into smaller pieces, ensuring each piece has at least one or two healthy eyes. This "refresh" keeps the plants vigorous and gives you more cannas to plant elsewhere.
Using Cannas in Your Garden Design
Since you now know cannas are perennials that can return year after year, you can plan your garden layout with more permanence in mind.
- Vertical Interest: Use tall cannas to break up the "flat" look of a garden bed. Their vertical stems draw the eye upward and provide a beautiful backdrop for shorter perennials like coreopsis or salvia.
- Container Focal Points: A single canna in a large pot, surrounded by trailing plants like sweet potato vine or petunias, creates a high-end "thriller, filler, spiller" arrangement that lasts all summer.
- Color Echoing: Match the color of your canna blooms to other elements in your yard. For example, red-flowering cannas look spectacular near red-leafed shrubs or garden furniture.
Conclusion
Canna lilies are some of the most versatile and rewarding plants you can add to your landscape. While they are technically tropical perennials, they are accessible to everyone, regardless of your climate. By matching your care routine to your specific hardiness zone, you can ensure these bold beauties provide a stunning display of color and texture every single year.
At Longfield Gardens, we believe that gardening should be an enjoyable and successful experience. Whether you choose to leave your cannas in the ground in the sunny South or carefully store them over the winter in the North, the result is the same: a spectacular garden that feels like a private getaway.
Final Thoughts
- Cannas are perennials in zones 8-11 and can be overwintered elsewhere.
- They grow from rhizomes, not true bulbs, and love heat and water.
- Lifting and storing rhizomes is an easy way to save your favorite varieties.
- Regular water and fertilizer ensure the best perennial performance.
Ready to start your own tropical oasis? Explore the canna collection at Longfield Gardens and find the perfect varieties to bring vibrant color and lush foliage to your backyard this season.
FAQ
Do I have to dig up cannas every year?
This depends on your USDA hardiness zone. If you live in zone 8 or warmer, you can usually leave canna rhizomes in the ground year-round with a layer of mulch for protection. If you live in zone 7 or colder, the ground will freeze deep enough to kill the rhizomes, so you must either dig them up and store them indoors or treat them as annuals and replant fresh ones each spring.
Can canna lilies survive a frost?
The foliage of canna lilies is very sensitive to frost and will typically turn brown or black after the first cold snap. However, the underground rhizomes are more resilient. A light frost won't kill the plant as long as the ground itself hasn't frozen. In fact, many gardeners wait for the first frost to blacken the leaves before digging up the rhizomes for winter storage.
How long do canna lily rhizomes last?
As perennials, canna lily rhizomes can theoretically live indefinitely if they are kept in the right conditions. As long as they are protected from freezing in the winter and provided with enough water and nutrients in the summer, they will continue to grow and multiply. Dividing the clumps every few years helps rejuvenate the plants and keeps them blooming vigorously.
Do canna lilies multiply over time?
Yes, canna lilies are excellent at multiplying. Because they grow from horizontal rhizomes, they naturally expand outward each season. A single rhizome planted in the spring can produce several new "offshoots" by the fall. This makes them a great plant for filling in large spaces or for dividing and sharing with friends and family.
