Table of Contents
- Introduction
- Understanding Canna Lilies
- When to Plant Canna Lilies
- Selecting the Best Location
- How to Plant Canna Lily Rhizomes
- Growing Cannas in Containers
- Essential Summer Care
- The Art of Deadheading
- Overwintering: Lifting and Storing
- Healthy Plants and Easy Troubleshooting
- Choosing Varieties for Your Style
- Summary of Canna Care
- FAQ
Introduction
Imagine stepping into your backyard and being greeted by towering, banana-like leaves and glowing, jewel-toned flowers that look like they belong in a Caribbean paradise. This is the magic of the canna lily. These plants are the ultimate "easy win" for gardeners who want to add bold texture and height to their summer landscape without a lot of fuss. Whether you have a sprawling garden bed or just a few sunny pots on a patio, cannas are incredibly rewarding to grow.
At Longfield Gardens, we love how cannas bridge the gap between architectural foliage and spectacular blooms. They are versatile, vigorous, and surprisingly simple to care for once you understand a few basic needs. This guide is designed for home gardeners who want to successfully grow canna lily varieties and keep them coming back year after year. From choosing the right spot to storing them over the winter, we will walk you through every step to ensure your garden feels like a tropical getaway.
With the right timing and a bit of sunshine, you can transform your outdoor space into a lush sanctuary filled with vibrant color and dramatic flair.
Understanding Canna Lilies
Cannas are often called "canna lilies," but they are not actually true lilies. They are more closely related to gingers and bananas. While many summer flowers are grown from true bulbs, cannas grow from rhizomes. A rhizome is a thick, fleshy underground stem that stores energy for the plant. If you look at a canna rhizome, you will see small bumps or nodes called "eyes." These eyes are where the new stems and leaves will emerge.
These plants are classified as tender perennials. This means that in warm climates (typically USDA zones 8 through 10), they can stay in the ground all year. In cooler regions, they are grown as annuals or the rhizomes are tucked away indoors for the winter. Because they grow so quickly, reaching heights of 3 to 8 feet in a single season, they are perfect for creating temporary privacy screens or focal points in the garden.
The beauty of cannas lies in their dual appeal. While the flowers—available in shades of red, orange, yellow, and pink—are stunning, the foliage is equally impressive. Some varieties have solid green or deep burgundy leaves, while others feature dramatic stripes of gold, cream, or bronze. For a deeper overview of plant habits and uses, see All About Cannas.
When to Plant Canna Lilies
Timing is everything when it comes to cannas. Because they are tropical in nature, they have zero tolerance for frost. Planting them too early in cold, damp soil can cause the rhizomes to sit idle or even rot before they have a chance to wake up.
The best rule of thumb is to wait until the soil has warmed to at least 60°F. For most gardeners, this coincides with the time you would typically plant tomatoes or peppers in the ground. If the air is warm enough for you to wear short sleeves comfortably, it is likely warm enough for your cannas. If you want a broader reference for timing and zone-based shipping, use our shipping information page.
If you live in a region with a short growing season, you can give your plants a head start. About 4 to 6 weeks before the last expected frost, plant the rhizomes in pots indoors. Place them in a warm, bright spot like a sunroom or under grow lights. This extra time allows the plant to develop a strong root system and a few inches of growth so that they are ready to take off the moment you move them outside.
Key Takeaway: The 60°F Rule Always wait for the soil to reach 60°F before planting outdoors. If you want earlier blooms, start your rhizomes in pots indoors a month before the last frost.
Selecting the Best Location
Cannas are not shy plants; they want to be noticed and they need specific conditions to look their best. To get those massive leaves and nonstop flowers, you need to match the plant's needs to the right spot in your yard.
Sunlight Needs
Cannas are true sun-seekers. For the most vibrant foliage and the highest number of flower spikes, aim for a spot that receives 6 to 8 hours of direct sunlight each day. While they can grow in partial shade, they often become "leggy," meaning the stems grow tall and weak as they reach for the light. Furthermore, the colorful patterns on variegated foliage often appear more vivid when the plant receives plenty of sun.
Soil and Drainage
"Drainage" refers to how quickly water leaves the soil after a rain or watering. Most garden plants prefer well-draining soil so their roots don't stay soggy. However, cannas are unique because they are very thirsty. They thrive in rich, organic soil that holds moisture well. They are even happy in "boggy" areas or near the edges of ponds. If your soil is very sandy and dries out quickly, you can improve it by mixing in a few inches of compost or aged manure before planting.
Wind Protection
Because cannas have large, soft leaves, they can act like sails in a strong breeze. High winds can tear the foliage, leaving the plant looking a bit "ratty" or shredded. If you live in a particularly windy area, try to plant your cannas near a fence, a wall, or a cluster of sturdy shrubs that can act as a windbreak. For more growing basics, planting tips, and care guidance, visit All About Cannas.
How to Plant Canna Lily Rhizomes
Once the weather is warm and you have picked the perfect spot, planting is a straightforward process. Follow these steps to get your cannas off to a great start. If you want a deeper step-by-step walkthrough, see How to Plant a Canna Bulb.
- Prepare the Soil: Use a garden fork or shovel to loosen the soil to a depth of about 8 to 10 inches. This makes it easier for the new roots to spread out. Mix in a little compost to provide natural nutrients.
- Dig the Hole: Create a shallow hole about 3 to 4 inches deep.
- Position the Rhizome: Lay the rhizome in the hole horizontally. Look for the "eyes" or growth points. These should be facing upward. If you aren't sure which side is up, don't worry—the plant is smart enough to find the light and grow toward the surface regardless of how it is positioned.
- Space Them Out: Cannas grow quite wide as they mature. Give them room to breathe by spacing them 18 to 24 inches apart. This ensures good air circulation, which helps prevent health issues later in the season.
- Cover and Water: Fill the hole with soil and press down gently with your hands to remove any large air pockets. Water the area thoroughly to help settle the soil around the rhizome.
What to Do Next: Early Growth Phase
- Keep the soil consistently moist but not flooded until you see sprouts.
- Be patient; cannas can take 2 to 3 weeks to show their first green shoots.
- Once sprouts appear, maintain a regular watering schedule to support rapid growth.
Growing Cannas in Containers
If you have limited garden space or want to decorate a porch or balcony, cannas are excellent candidates for container gardening. Growing them in pots also makes it much easier to move them indoors when the weather turns cold. For a fuller container-specific guide, see How to Grow Canna Bulbs in Containers.
Choosing the Right Pot
Because cannas grow tall and heavy, you need a sturdy container that won't tip over in the wind. A pot that is at least 12 to 15 inches in diameter is a good size for a single rhizome. If you are planting a larger variety, go even bigger. Make sure the container has drainage holes in the bottom so that excess water can escape.
Potting Mix
Avoid using garden soil in pots, as it is too heavy and can become compacted. Instead, use a high-quality potting mix designed for containers. These mixes are lightweight and allow for a healthy balance of air and moisture around the roots.
Planting Depth in Pots
In a container, you can plant the rhizome slightly shallower than in the ground—about 2 to 3 inches deep. Leave a couple of inches of space between the top of the soil and the rim of the pot to make watering easier. If you're deciding how many rhizomes belong in a single pot, use How Many Canna Bulbs Per Container? as a reference.
Essential Summer Care
Once your cannas are established and growing tall, they require very little "work," but they do have a high appetite for water and nutrients.
Watering for Success
Cannas are often described as having "wet feet." In the heat of the summer, they can be incredibly thirsty. If the soil stays dry for too long, the leaves may begin to turn brown at the edges. During the peak of summer, you may need to water your cannas every few days, or even daily if they are in containers. A deep soaking is better than a light sprinkle, as it encourages the roots to grow deep into the ground.
Feeding Your Plants
Because cannas produce so much growth in a single season, they are "heavy feeders." They appreciate a steady supply of nutrients. You can apply a balanced, slow-release fertilizer at planting time, or use a water-soluble fertilizer every few weeks throughout the summer. Following the instructions on the product label will ensure your plants get exactly what they need to stay lush and green.
Mulching
Applying a 2-inch layer of mulch around the base of your plants is one of the easiest ways to keep them happy. Mulch helps the soil retain moisture, keeps the roots cool, and prevents weeds from competing for nutrients. Use organic materials like shredded bark, compost, or straw. For more care advice, including watering and feeding, see How to Care for Canna Lily Bulbs.
The Art of Deadheading
"Deadheading" is simply the process of removing spent or faded flowers. For cannas, this is more than just a way to keep the plant looking tidy—it actually encourages the plant to produce more blooms.
Canna flower spikes usually produce multiple blossoms that open one after another. Once an individual flower fades, you can snip it off. When the entire flower spike has finished blooming, look down the stem. You will often see another flower bud forming just below the old one. Cut the old stalk off just above that new bud.
If you don't deadhead, the plant will put its energy into producing seeds instead of new flowers. By removing the old blooms, you signal to the plant that it should keep blooming right up until the first frost.
Key Takeaway: Keep the Blooms Coming Snip off faded flowers to prevent seed production. This simple step directs the plant's energy into creating new flower spikes all summer long.
Overwintering: Lifting and Storing
In much of the United States, winters are too cold for canna rhizomes to survive outdoors. If you live in Zone 7 or colder, you have two choices: treat them as annuals and buy new ones each spring, or "lift" and store them.
When to Lift
Wait for the first frost of the autumn. The frost will turn the foliage black or brown, which is perfectly normal. This is your signal that the plant has gone dormant and is ready for its winter nap.
How to Store Rhizomes
- Cut Back: Use garden shears to cut the stalks down to about 4 inches above the ground.
- Dig Gently: Use a shovel or garden fork to carefully lift the clump of rhizomes out of the soil. Start digging about a foot away from the center of the plant to avoid slicing into the fleshy stems.
- Clean: Gently shake off the excess soil. You don't need to wash them; in fact, keeping them a bit "dirty" can help prevent them from drying out too much.
- Dry: Let the rhizomes sit in a dry, shaded area (like a garage or shed) for a few days to "cure." This toughens the outer skin.
- Pack: Place the rhizomes in a box or breathable bag. Layer them with slightly damp peat moss, vermiculite, or even wood shavings. Do not use plastic bags, as they can trap moisture and cause rot.
- Store: Keep the box in a cool, dark, frost-free place where the temperature stays between 40°F and 50°F. A basement or an insulated crawlspace is usually ideal.
Overwintering in Warm Climates
If you live in Zone 8 or warmer, you can usually leave your cannas in the ground. Simply cut the foliage back to the ground after the first frost and apply a thick 4-to-6-inch layer of mulch (like straw or leaves) over the top. This acts as a warm blanket to protect the rhizomes from occasional cold snaps.
Healthy Plants and Easy Troubleshooting
Cannas are generally very robust, but like any plant, they can occasionally run into a few hurdles. Leading with the right care usually prevents most issues.
Leaf Rollers
If you notice that the new leaves are staying rolled up or have small holes in them, you might have canna leaf rollers. These are small caterpillars that use silk to stitch the leaf shut. The best way to handle this is to keep an eye on your plants early in the season. You can manually unroll the leaf and remove the caterpillar, or use a naturally occurring soil bacterium called Bt (Bacillus thuringiensis), which is a common and gentle way to manage caterpillars in the garden.
Canna Rust
In very humid climates, you might see orange, rusty-looking spots on the leaves. This is a fungus called rust. To prevent this, ensure your plants have plenty of space for air to move between them. If you see affected leaves, simply snip them off and dispose of them in the trash (not the compost pile) to stop the spores from spreading.
Not Enough Blooms
If your canna has beautiful leaves but no flowers, it is usually asking for more of two things: sun or food. Make sure the plant isn't being shaded by nearby trees as the season progresses. Also, ensure you are providing a bit of fertilizer to give the plant the energy it needs to push out those heavy flower spikes.
Choosing Varieties for Your Style
We offer a wide range of cannas at Longfield Gardens, and picking the right one can be the most fun part of the process. Consider how you want to use them in your landscape. If you're looking for taller performers, browse our Tall Cannas collection.
- For Height and Privacy: Look for "tall" varieties like 'Wyoming' or 'Striata'. These can easily reach 6 feet or more, making them perfect for the back of a flower bed.
- For Dramatic Foliage: Varieties like Phasion (Tropicanna) feature multi-colored stripes that look beautiful even when the plant isn't in bloom.
- For Small Spaces: Look for "dwarf" or "compact" varieties. These usually stay under 3 feet tall and are perfect for containers or the front of a border. Our Short Cannas collection is a great place to start.
If you want an easy mix of heights and colors, our Canna Assorted Collection is another good option.
Summary of Canna Care
Growing cannas is a rewarding way to add high-impact color and a tropical feel to your home garden. By focusing on the few things they love most—heat, sun, and water—you can enjoy a spectacular display from midsummer right through the first frost of autumn.
- Planting: Wait for 60°F soil; plant 3-4 inches deep and 18-24 inches apart.
- Location: Choose a sunny, wind-sheltered spot with moist, rich soil.
- Maintenance: Water deeply and regularly; feed with a balanced fertilizer.
- Deadheading: Remove faded blooms to encourage a continuous flower show.
- Winter: Lift and store rhizomes in cold zones; mulch heavily in warm zones.
"Cannas are the heavy hitters of the summer garden. With their lush foliage and bold blooms, they provide a tropical architecture that few other plants can match, all while being remarkably easy for any gardener to master."
We invite you to explore the world of cannas and see just how much life and color they can bring to your yard. Whether you are a beginner or a seasoned pro, these plants are sure to become a highlight of your summer garden. For more inspiration and to find the perfect varieties for your home, visit us at Longfield Gardens. Happy planting!
FAQ
How long does it take for canna lilies to bloom?
Once planted in warm soil, cannas usually take about 10 to 12 weeks to produce their first flowers. Starting them indoors 4 to 6 weeks before the last frost can significantly shorten this wait time once they are moved outside.
Can canna lilies grow in the shade?
While cannas can survive in partial shade, they will not perform their best. They need at least 6 hours of direct sunlight to produce strong stems, vibrant leaf colors, and plenty of flower spikes.
Why are my canna lily leaves turning brown at the edges?
Brown edges are usually a sign that the plant is thirsty. Cannas prefer consistently moist soil and can struggle during periods of extreme heat if they don't receive enough water. Increasing your watering frequency and adding a layer of mulch often solves this.
Do I need to soak canna rhizomes before planting?
Soaking is not strictly necessary, but placing the rhizomes in a bucket of lukewarm water for a few hours before planting can help "wake them up." This can be especially helpful if the rhizomes feel very dry or have been in storage for a long time.