Table of Contents
- Introduction
- The Short Answer: Bulbs vs. Rhizomes
- Why the Distinction Matters for Your Garden
- Identifying Healthy Canna Rhizomes
- The Tropical Personality of Canna Lilies
- Right Plant, Right Place: Sunlight and Soil
- Timing Your Planting for Success
- Step-by-Step: How to Plant Canna Rhizomes
- Caring for Your Cannas During the Summer
- Handling Pests with Ease
- End of Season Care: What to Do in the Fall
- Dividing Rhizomes for More Plants
- Cannas in Containers
- Realistic Expectations for Your Garden
- Creating a Tropical Design
- Why Choose Canna Rhizomes?
- Conclusion
- FAQ
Introduction
There is nothing quite like the sight of a canna lily unfurling its massive, tropical leaves in the heat of midsummer. These plants bring an instant vacation vibe to any backyard, with foliage that looks like it belongs in a rainforest and flowers that glow in shades of sunset orange, fire-engine red, and brilliant yellow. If you are looking to add height and drama to your flower beds, the Cannas Bulbs for Sale collection is one of the most rewarding choices you can make.
While many people refer to them as "canna bulbs," you might be surprised to learn that they do not actually grow from true bulbs. At Longfield Gardens, we want to help you understand exactly what you are planting so you can give your garden the best start possible. For a broader overview of these plants, see All About Cannas.
In this guide, we will answer the question of whether canna lilies are bulbs and explain how their unique growth habit affects how you plant and care for them. You will learn how to identify their growing points, how to get them into the ground at the right time, and how to keep them looking lush all season long. Understanding the difference between a bulb and a rhizome is the first step toward a spectacular summer display.
The Short Answer: Bulbs vs. Rhizomes
When you hold a canna "bulb" in your hand, you are actually holding a rhizome. To the casual observer, the terms are often used interchangeably, but there is a distinct difference in how these plants store energy and grow.
A true bulb, like a tulip or an onion, is a self-contained package of fleshy scales that protect a tiny flower bud inside. A rhizome, on the other hand, is a modified underground stem. Instead of being a vertical, rounded shape, rhizomes typically grow horizontally just beneath the soil surface. They act like an underground pantry, storing energy for the plant to use when it is time to sprout.
Cannas use these thick, fleshy stems to spread and create new shoots. If you look closely at a canna rhizome, you will see small bumps or "eyes." These are the growth points where the stems and leaves will eventually emerge. Because they are stems rather than bulbs, they have a segmented appearance and can be quite large and irregularly shaped.
Key Takeaway: While commonly called "bulbs," canna lilies grow from rhizomes, which are thick underground stems that grow horizontally and store the plant's energy.
Why the Distinction Matters for Your Garden
Knowing that a canna is a rhizome changes how you handle and plant it. Because rhizomes grow horizontally, they need a bit more "shoulder room" in the soil than a typical vertical bulb. Understanding this growth habit helps you visualize how the plant will develop underground throughout the season.
Rhizomes are also easier to divide than many true bulbs. As the plant grows throughout the summer, the rhizome expands and creates more "eyes." This means that after a successful growing season, you often end up with a much larger root system than what you started with in the spring. This natural expansion is one of the reasons cannas are such a cost-effective way to fill a large garden space.
Identifying Healthy Canna Rhizomes
When your shipment from us arrives, our Shipping Information page can help you know what to expect, or when you are checking your stored rhizomes in the spring, you want to look for specific signs of health. A healthy canna rhizome should feel firm and heavy for its size. It should not feel hollow, light, or mushy.
The color of the rhizome can vary depending on the variety, but most are a creamy white or tan color on the inside if they have a small nick. The "eyes" or growth points are the most important part to look for. These are often pinkish or white and look like small, pointed buds. As long as a rhizome has at least one or two healthy eyes, it has everything it needs to produce a beautiful plant.
What to Look For:
- Firmness: The rhizome should feel solid, similar to a fresh ginger root.
- Weight: It should feel "full" of moisture and energy.
- Visible Eyes: Look for at least 1–3 growth points per piece.
- Size: Larger rhizomes generally have more stored energy, leading to faster growth in early summer.
The Tropical Personality of Canna Lilies
Canna lilies are native to tropical and subtropical regions of the Americas. This heritage tells us everything we need to know about what they like in a garden. They are heat-lovers through and through. While some perennials wake up at the first sign of spring, cannas prefer to wait until the weather is consistently warm.
They are also famous for their foliage. Some varieties, like the Musifolia, are grown primarily for their massive green leaves that can reach heights of 8 feet or more. Others, such as Canna Tall Tropicanna, feature striped leaves in shades of burgundy, gold, and green.
When you plant a canna, you aren't just getting a flower; you are getting a structural powerhouse that provides privacy and texture. If you want more giants, browse Tall Cannas.
Right Plant, Right Place: Sunlight and Soil
The first rule of successful gardening is matching the plant to its environment. For cannas, the recipe is simple: lots of sun and plenty of water.
Sunlight Requirements
To get those brilliant blooms and vibrant leaf colors, cannas need full sun. In most regions, this means at least six to eight hours of direct sunlight every day. If they are planted in too much shade, they tend to get "leggy," meaning the stems grow tall and weak as they reach for the light. They may also produce fewer flowers or lose the intense coloring in their foliage.
Soil and Drainage
Cannas are unique because they are one of the few garden plants that actually enjoy "wet feet." In their native habitats, they often grow near the edges of ponds or in marshy areas. This makes them an excellent choice for damp spots in your yard where other plants might struggle.
However, they are very adaptable. They will grow beautifully in standard garden soil as long as you keep them well-watered. If your soil is very sandy, you may want to add some compost or organic matter to help hold onto moisture. If you are planting in containers, make sure to use a high-quality potting mix and a pot with a drainage hole, as standing water in a pot can become stagnant. For more container basics, see How to Grow Summer Bulbs in Containers.
Timing Your Planting for Success
Timing is the most important factor when it comes to cannas. Because they are tropical plants, they have no tolerance for frost. If you plant them too early in cold, wet soil, the rhizomes may simply sit there and struggle.
We recommend waiting to plant your cannas outdoors until the soil temperature has reached at least 60°F. A good rule of thumb is to plant them around the same time you would plant tomatoes or basil. In most parts of the US, this is well after the last spring frost. For a quick zone reference, check the Hardiness Zone Map.
If you live in a northern climate with a short growing season, you can give your cannas a head start by planting them in pots indoors about four to six weeks before the last frost. Place the pots in a warm, sunny window. By the time the weather warms up, you will have established plants ready to take off as soon as they hit the garden soil.
What to do next: Getting Started
- Check your local frost dates to determine your safe planting window.
- Select a spot in your garden that receives at least 6 hours of full sun.
- If you're in a cold zone, consider starting your rhizomes in pots indoors.
- Ensure you have a source of water nearby, as cannas are thirsty plants.
Step-by-Step: How to Plant Canna Rhizomes
Planting cannas is a straightforward process. Because they grow from rhizomes, the orientation and depth are the two main things to get right.
1. Prepare the Soil
Loosen the soil to a depth of about 6–8 inches. If your soil is poor, mix in some compost or a balanced, slow-release fertilizer. This gives the roots easy paths to grow and provides the nutrients needed for that rapid summer growth.
2. Determine Orientation
Look for the "eyes" or the pointed growth buds on the rhizome. These should face upward. If you can't tell which side is up, don't worry—the plant is smart enough to find the light. Planting the rhizome horizontally (flat) is usually the best approach.
3. Set the Depth
Cannas do best when planted about 2 to 4 inches deep. If you plant them too deep, it will take them longer to emerge. If you plant them too shallow, the heavy stalks might not have enough stability as they grow tall.
4. Spacing
Give your cannas room to breathe. For most varieties, spacing them 1–2 feet apart is ideal. This allows for good air circulation around the large leaves and gives the rhizomes room to expand underground throughout the season.
5. Water Thoroughly
Immediately after planting, give the area a good soak. This settles the soil around the rhizome and "wakes it up."
Caring for Your Cannas During the Summer
Once cannas start growing, they move fast. They are "heavy feeders," meaning they use a lot of energy and nutrients to produce those massive leaves and flowers.
Watering Regularly
During the heat of summer, cannas should never be allowed to dry out completely. If the soil feels dry an inch below the surface, it is time to water. In containers, you may find yourself watering every day during July and August. If the leaves start to look a bit crispy around the edges, it’s often a sign that the plant needs more consistent moisture.
Fertilizing for Blooms
Because they grow so much biomass in a single season, cannas benefit from regular feeding. A balanced liquid fertilizer applied every few weeks, or a slow-release granular fertilizer applied at planting and again mid-summer, will keep them looking their best.
Deadheading
To keep the flowers coming, you should "deadhead" the spent blooms. This simply means cutting off the flower stalk once the blossoms have faded. This prevents the plant from putting energy into making seeds and encourages it to send up new flower spikes. When you cut, look for the next bud down the stem and cut just above it. For a fuller walkthrough, see How and Why to Deadhead Flowers.
Handling Pests with Ease
Cannas are generally very sturdy, but they do have one common visitor: the canna leaf roller. This is the caterpillar of a small butterfly that rolls itself up inside the emerging leaves to stay protected while it eats.
If you notice leaves that are "stitched" shut with silk or have holes in a straight line across the leaf, you likely have leaf rollers. The easiest win here is to simply unroll the leaf by hand and remove the caterpillar, or use an organic spray containing Bacillus thuringiensis (Bt), which is a naturally occurring soil bacterium. It is a simple fix that keeps your foliage looking pristine without much stress.
End of Season Care: What to Do in the Fall
What you do with your canna rhizomes in the autumn depends entirely on where you live. Cannas are perennials in warm climates (roughly USDA zones 8–11), but in colder regions, they are treated as "tender perennials."
In Warm Climates (Zones 8–11)
In these areas, cannas can stay in the ground all year. Once the foliage dies back after the first frost, simply cut the stems down to about 2–3 inches above the soil. You can add a layer of mulch over the top to provide a little extra protection during the winter months. They will sprout again on their own when the soil warms up in the spring.
In Cold Climates (Zones 3–7)
In most of the US, the ground freezes deep enough to damage the rhizomes. To save them for next year, you will need to "lift" and store them. For step-by-step storage help, see Winter Storage for Tender Bulbs and Tubers.
- Wait for Frost: Let the first light frost blacken the foliage. This tells the plant to move its energy down into the rhizome.
- Cut Back: Cut the stems down to about 4 inches.
- Dig Gently: Use a garden fork or shovel to lift the rhizomes out of the ground. Be careful not to bruise or cut them.
- Clean and Dry: Shake off excess soil and let them dry in a shady, well-ventilated spot for a few days.
- Store: Place the rhizomes in a box filled with peat moss, perlite, or even wrapped in newspaper. Store them in a cool, dark, frost-free place (like a basement or crawlspace) that stays between 40°F and 50°F.
Dividing Rhizomes for More Plants
One of the most rewarding things about growing cannas is how they multiply. A single rhizome planted in May can easily become a cluster of three or four by October.
The best time to divide your cannas is in the spring, just before you plant them. Use a clean, sharp knife to cut the rhizome into pieces. The only rule is to make sure each piece has at least one healthy "eye." Let the cut ends dry and "callous" over for a day or two before putting them in the ground. This simple step prevents rot and ensures a healthy start.
Cannas in Containers
If you don't have a large garden plot, cannas are fantastic for container gardening. They add height to a "thriller, filler, spiller" arrangement. If you need a smaller footprint, browse Short Cannas.
Choose a large pot—at least 15–18 inches in diameter—to accommodate the rhizome growth. Because pots dry out faster than the ground, you will need to be extra diligent with watering. A potted canna on a sunny patio can grow just as tall and beautiful as one in the ground, providing a portable piece of the tropics wherever you need it most.
Realistic Expectations for Your Garden
While we provide premium rhizomes at Longfield Gardens, it is important to remember that gardening is a partnership with nature. Your specific soil, local weather patterns, and the amount of sun your yard gets will all play a role in how your cannas perform.
For example, if you have a particularly cool, cloudy summer, your cannas might grow a bit slower or bloom a little later than usual. If you have very heavy clay soil, they might need a bit more help with drainage to prevent the rhizomes from getting too soggy during a rainy spring. For a more moderate size, browse Medium Cannas. These variations are part of the fun of gardening! The goal is to learn what your plants like and adjust as you go.
Creating a Tropical Design
Cannas work beautifully when planted in groups. Instead of dotting a single plant here and there, try planting them in clusters of three or five. This creates a much more dramatic impact.
They also make wonderful "living screens." If you have a neighbor's fence or a utility box you’d rather not see, a row of tall cannas provides a lush, green wall that lasts all summer. Pair them with other sun-lovers like dahlias, zinnias, or ornamental grasses to create a vibrant, textured landscape.
Why Choose Canna Rhizomes?
If you are looking for a plant that offers a high "return on investment," cannas are hard to beat. They grow incredibly fast, reach impressive heights, and provide color for months. Because they are so easy to lift and store, a one-time purchase can provide beauty for years to come as the plants continue to multiply.
We take pride in sourcing high-quality, healthy rhizomes from trusted growers. Whether you want the towering presence of a Musifolia or the sunset-striped leaves of a Tropicanna, starting with a healthy, firm rhizome is the key to garden success. The Canna Assorted Mix - Bulk Offer is a simple way to get started.
Key Takeaway: The Canna Advantage
- Fast growth provides a "finished" garden look quickly.
- Extremely drought-tolerant once established, though they prefer moisture.
- Few serious pest or disease issues in most US gardens.
- Easy to multiply through simple division.
Conclusion
So, are canna lilies bulbs? Technically, no—they are rhizomes. But whether you call them bulbs, tubers, or rhizomes, the result is the same: a breathtakingly beautiful, tropical-inspired garden that thrives in the summer heat. By understanding that they are thick, energy-storing stems that love sun and water, you can unlock their full potential in your own yard.
At Longfield Gardens, we love cannas because they make grand-scale gardening accessible to everyone. They are sturdy, forgiving, and undeniably spectacular. Once you see that first bright bloom against a backdrop of lush, banana-like leaves, you’ll understand why these garden giants are a favorite for so many.
- Planting Tip: Wait for 60°F soil for the fastest start.
- Care Tip: Keep them watered and fed for maximum height.
- Winter Tip: Lift and store in zones 3–7 to enjoy them again next year.
We encourage you to try a few different varieties this season. There is a canna for every garden style, and we are here to support you every step of the way. Happy planting!
FAQ
Can I plant canna rhizomes in the fall?
In most parts of the US, it is best to plant cannas in the spring after the danger of frost has passed. Because they are tropical plants, they need warm soil to begin growing. Planting them in the fall in cold climates would likely result in the rhizome freezing and rotting underground during the winter.
How deep should I plant my canna "bulbs"?
Canna rhizomes should be planted approximately 2 to 4 inches deep. This depth provides enough soil cover to keep the rhizome moist and stable as the plant grows tall, but it is shallow enough that the soil can stay warm and encourage early sprouting.
Why are my canna leaves turning brown at the edges?
Brown or "crispy" edges on canna leaves are usually a sign of underwatering or heat stress. Because cannas have such large leaf surfaces, they lose moisture quickly through evaporation. Ensure the soil stays consistently moist, and consider adding mulch around the base of the plant to help retain soil moisture during heatwaves.
Do cannas need to be dug up every year?
This depends on your USDA hardiness zone. If you live in Zone 8 or warmer, you can usually leave them in the ground year-round with a layer of mulch for protection. If you live in Zone 7 or colder, you will need to lift the rhizomes in the fall after the first frost and store them in a frost-free place until the following spring.