How to Grow Canna Lilies for a Tropical Garden

Table of Contents

1. Introduction
2. Understanding Canna Lilies
3. Choosing the Best Location
4. When to Plant Cannas
5. How to Plant Canna Rhizomes
6. Caring for Cannas Throughout the Summer
7. Growing Cannas in Containers
8. Overwintering and Storage
9. Troubleshooting Common Issues
10. Conclusion
11. FAQ

Introduction

Nothing transforms a backyard into a lush, tropical oasis quite like the bold foliage and vibrant blooms of canna lilies. These architectural plants are the ultimate summer showstoppers, offering a high-impact look that belies how easy they are to grow. At Longfield Gardens, we love cannas because they bring a sense of drama and scale to the garden that few other plants can match. Whether you have a sprawling sunny border or a small urban patio, cannas are incredibly versatile and rewarding. (longfield-gardens.com)

In this guide, we will walk you through everything you need to know about how to grow canna, from selecting the right spot to overwintering your plants for next year. We focus on the simple, practical steps that lead to success so you can spend less time worrying and more time enjoying your garden. By following a few basic rules regarding sun, water, and timing, you can grow these exotic-looking beauties with confidence. (longfield-gardens.com)

Understanding Canna Lilies

Cannas are often called canna lilies, though they are not true lilies. They grow from thick, fleshy underground stems called rhizomes. These rhizomes store energy and moisture, which helps the plant grow at an impressive rate once the summer heat arrives. In a single season, some varieties can reach heights of six to eight feet, creating a living screen of greenery and flowers. (longfield-gardens.com)

What makes cannas truly special is their dual appeal. While the flowers are undeniably beautiful—appearing in shades of red, orange, yellow, pink, and bicolor—the foliage is often the main event. Depending on the variety, the leaves can be bright emerald green, deep burgundy, chocolatey bronze, or even striped with yellow and cream. This makes them valuable additions to the landscape even when they aren't in bloom. (longfield-gardens.com)

Popular Canna Varieties

When choosing cannas, it is helpful to think about the height and the color of the leaves. We offer a variety of options to suit different garden styles:

• Canna 'Tropicanna': Known for its spectacular variegated leaves with stripes of burgundy, gold, and green, topped with bright orange flowers.
• Canna 'Stuttgart': Highly sought after for its dramatic white and green variegated foliage, though it prefers a bit of afternoon shade to prevent leaf burn.
• Canna Assorted Collection: A mix of canna varieties and heights for a fuller tropical look. (longfield-gardens.com)

Choosing the Best Location

Getting the "right plant in the right place" is the most important step for canna success. Because these are tropical and subtropical plants, they have specific needs when it comes to light and moisture. (longfield-gardens.com)

Sun Requirements

Cannas are true sun-seekers. To produce the most vibrant leaf colors and the largest number of flowers, they need full sun. This means a spot that receives at least six to eight hours of direct sunlight each day. If you plant them in too much shade, they tend to become "leggy," stretching toward the light and producing fewer blooms. The foliage of bronze-leaved varieties also stays darker and richer when exposed to plenty of sun. (longfield-gardens.com)

Soil and Drainage

While many summer-blooming plants require perfectly drained soil, cannas are a bit more flexible. In fact, they are one of the few garden plants that actually enjoy "wet feet." They thrive in rich, moisture-retentive soil and can even be grown at the edge of a pond or in a boggy area. However, if your soil is very heavy clay, adding some compost or well-rotted manure will help improve the texture and provide the nutrients these heavy feeders crave. (longfield-gardens.com)

Wind Protection

Because canna leaves are so large and broad, they can act like sails in a high wind. In very exposed areas, the leaves may tear or "shred" along the edges. If you live in a particularly windy area, try to plant your cannas near a fence, a wall, or a group of sturdy shrubs that can provide a bit of a windbreak. This keeps the foliage looking pristine and prevents the tall flower stalks from leaning. (longfield-gardens.com)

Key Takeaway: For the best results, place your cannas in the sunniest, warmest spot in your garden. They love heat and moisture, so don't be afraid of a damp corner.

When to Plant Cannas

Timing is everything when it comes to cannas. Because they are tender perennials, they cannot tolerate frost. In fact, they don't even like cool soil. (longfield-gardens.com)

The 60-Degree Rule

A good rule of thumb is to wait until the soil temperature reaches at least 60°F before planting canna rhizomes directly into the ground. A simple way to judge this without a thermometer is to wait until it is time to plant tomatoes and peppers in your area. If the nights are still chilly and you’re still wearing a light jacket in the evening, it’s probably too early for cannas to go outside. (longfield-gardens.com)

Starting Early Indoors

If you live in a region with a short growing season (Zones 3 through 6), you can get a head start by "starting" your cannas indoors. About four to six weeks before the last expected frost, plant the rhizomes in pots filled with moist potting soil. Keep the pots in a warm, sunny spot or under grow lights. By the time the weather warms up outside, you’ll have established plants ready to go into the garden, which means you'll see flowers much earlier in the summer. (longfield-gardens.com)

Understanding Your Zone

Cannas are winter hardy in USDA Zones 7 through 11. In these warmer climates, the rhizomes can stay in the ground all year long. In Zones 6 and colder, the rhizomes will need to be lifted and stored indoors for the winter, or you can simply treat them as annuals and plant fresh ones each spring. For help checking your local planting window, see our Shipping Information. (longfield-gardens.com)

How to Plant Canna Rhizomes

Planting canna rhizomes is a simple process. They are tough and forgiving, but getting the depth and spacing right ensures they have the room they need to grow. (longfield-gardens.com)

Step-by-Step Planting Guide

1. Prepare the soil: Loosen the soil to a depth of about 10–12 inches. This is a great time to mix in a few inches of compost to give the plants a nutrient boost.
2. Check the rhizome: Look for the "eyes" on the rhizome. These are the small, rounded bumps where the new growth will emerge.
3. Dig the hole: Dig a hole about 4 inches deep.
4. Position the rhizome: Lay the rhizome horizontally in the hole with the eyes facing up. If you can't tell which side is up, don't worry—the plant will figure it out and grow toward the light.
5. Space them out: Give your cannas room to breathe. Space large varieties 18 to 24 inches apart. Smaller, dwarf varieties can be planted about 12 inches apart.
6. Cover and water: Fill the hole with soil and press down firmly to remove air pockets. Water the area well to settle the soil around the rhizome. For more spacing guidance, see How Far Apart Should You Plant Canna Bulbs?. (longfield-gardens.com)

What to Do Next

• Mark the spot: Cannas can be slow to emerge, sometimes taking three weeks or more to poke through the soil. Use a garden stake so you don't accidentally dig them up while planting other things.
• Wait to water: After the initial planting, don't overwater. Wait until you see the first green shoots before you start a regular watering schedule.
• Mulch: Once the shoots are a few inches tall, apply a layer of mulch to help keep the soil moist and suppress weeds. (longfield-gardens.com)

Caring for Cannas Throughout the Summer

Once cannas get started, they are very low-maintenance. However, because they grow so much in such a short time, they do have a high demand for water and nutrients. (longfield-gardens.com)

Watering Correctly

Cannas are thirsty plants. During the heat of the summer, they should never be allowed to dry out completely. If the leaves start to curl or the edges look brown and crispy, it’s a sign they need more water. In most gardens, a deep soaking once or twice a week is sufficient. If you are growing them in containers or very sandy soil, you may need to water them every day during a heatwave. For more watering tips, see How Often to Water Canna Bulbs for Best Blooms. (longfield-gardens.com)

Feeding Your Plants

Think of cannas as the "linebackers" of the garden—they need a lot of fuel to maintain their size. We recommend using a balanced, slow-release fertilizer at planting time. You can also supplement with a water-soluble fertilizer every few weeks during the peak growing season. If you prefer organic methods, a top-dressing of compost or a dose of fish emulsion works wonders. (longfield-gardens.com)

Deadheading for More Blooms

To keep your cannas looking tidy and to encourage more flowers, you should "deadhead" the spent blooms. Canna flowers grow on a spike, with several buds opening in succession. Once an individual flower fades, you can snip it off. When the entire flower spike has finished blooming, cut the stalk back to the next side shoot where a new flower spike may be forming. This prevents the plant from putting energy into seed production and keeps the color coming until the first frost. (longfield-gardens.com)

Key Takeaway: Consistency is the secret to impressive cannas. Regular water and a bit of extra fertilizer will result in taller plants and more frequent blooms.

Growing Cannas in Containers

If you don't have a large garden bed, cannas are excellent candidates for containers. They provide height and structure to patio arrangements and can even be used as a "thriller" in the center of a large pot. For more container inspiration, see How to Start Canna Bulbs for a Tropical Summer Garden. (longfield-gardens.com)

Selecting the Right Pot

Because cannas grow tall and have large root systems, they need a substantial container. A pot that is at least 15 to 18 inches in diameter is ideal for a single rhizome. Ensure the pot has drainage holes at the bottom so the soil doesn't become stagnant, even though cannas like moisture. Heavy pots made of ceramic or stone are best because they provide a sturdy base that won't tip over when the canna reaches its full height. (longfield-gardens.com)

Potting Mix and Planting

Use a high-quality, well-draining potting mix. Do not use garden soil in containers, as it can be too heavy and may contain pests or diseases. Plant the rhizome about 4 inches deep, just as you would in the ground. Because containers dry out faster than the ground, you will need to be diligent about watering. Adding a layer of mulch to the top of the pot can help retain moisture. (longfield-gardens.com)

Companion Plants

Cannas look stunning when paired with other sun-loving plants. Try these combinations in a large container:

• Canna and Sweet Potato Vine: The trailing vines provide a "spiller" effect against the tall canna.
• Canna and Lantana: The clusters of small flowers provide a nice contrast to the large canna blooms.
• Canna and Coleus: Choose a coleus variety that matches the colors in the canna leaves for a high-contrast foliage display. (longfield-gardens.com)

Overwintering and Storage

In most parts of the United States, cannas will not survive the winter outdoors. If you live in Zone 6 or colder and want to keep your plants for next year, you will need to lift the rhizomes and store them in a frost-free place. If you need help timing shipping and planting by zone, start with our Shipping Information. (longfield-gardens.com)

When to Lift the Rhizomes

Wait for the first frost of autumn to hit the foliage. You will notice the leaves turn black or brown almost overnight. This is the signal that the plant has gone dormant and is ready for storage. Cut the stalks down to about 4 to 6 inches above the ground. (longfield-gardens.com)

Digging and Cleaning

Carefully dig around the clump with a garden fork or spade, being careful not to slice into the rhizomes. Gently lift the entire clump out of the ground. Shake off the excess soil. You don't need to wash them; in fact, keeping them a bit dry helps prevent rot. Let the clumps sit in a protected, dry area (like a garage or shed) for a few days to "cure." (longfield-gardens.com)

Storage Tips

• Divide if needed: Fall is a great time to break large clumps into smaller sections. Ensure each piece has at least one or two "eyes."
• Packing material: Place the rhizomes in a cardboard box or plastic bin. Surround them with slightly damp peat moss, vermiculite, or even shredded newspaper. The goal is to keep them from drying out completely without making them so wet that they rot.
• Temperature: Store the box in a cool, dark place where temperatures stay between 40°F and 50°F. An unheated basement or a crawl space is usually perfect.
• Monthly check: Check your rhizomes once a month during the winter. If they look shriveled, lightly mist the packing material with water. If you see any soft or rotten spots, cut them away immediately. For more seasonal guidance, see our About Us and Guarantee. (longfield-gardens.com)

Troubleshooting Common Issues

Cannas are generally very healthy plants, but like any garden favorite, they can occasionally run into trouble. Most issues are easy to fix once you know what to look for. If you want a broader overview of canna care, see All About Cannas. (longfield-gardens.com)

Canna Leaf Rollers

The most common pest for cannas is the leaf roller, which is the caterpillar of a small moth. These pests stitch the edges of the leaves together with silk before the leaves can unfurl. If you see leaves that are "stuck" in a rolled position or have holes in a straight line across the leaf, you likely have leaf rollers. The easiest way to manage them is to manually unroll the leaves and remove the caterpillars. For larger outbreaks, an organic spray containing Bacillus thuringiensis (Bt) can be very effective when applied early in the season. (longfield-gardens.com)

Japanese Beetles

In mid-summer, Japanese beetles may stop by to snack on the flowers and foliage. They usually don't cause permanent damage to the plant, but they can make the leaves look "skeletonized." You can knock them into a bucket of soapy water in the early morning when they are sluggish, or use a mesh cover if the infestation is severe. (longfield-gardens.com)

Non-Blooming Cannas

If your cannas are growing lots of leaves but no flowers, it is usually due to one of three things:

1. Not enough light: They need at least six hours of full sun.
2. Not enough food: Cannas are heavy feeders; try adding more fertilizer.
3. Late start: If the rhizomes were planted too late or the spring was very cold, they might just need a little more time to reach maturity. (longfield-gardens.com)

Virus Concerns

If you notice yellow streaking or mosaic-like patterns on the leaves that don't look like normal variegation, the plant might have a virus. Unfortunately, there is no cure for plant viruses. To protect the rest of your garden, it is best to remove and dispose of the affected plant (do not compost it). Buying high-quality rhizomes from a trusted source like Longfield Gardens is the best way to avoid these issues. (longfield-gardens.com)

Conclusion

Growing cannas is a rewarding way to add vertical interest and tropical flair to your landscape. Their fast growth and dramatic presence make them feel like a major garden achievement, yet they require very little specialized care. By simply providing plenty of sun, consistent water, and a bit of protection from the cold, you can enjoy these spectacular plants year after year. (longfield-gardens.com)

Remember the basics:

• Plant when the soil is warm (60°F).
• Choose a sunny spot with rich, moist soil.
• Water deeply and fertilize regularly.
• Lift and store the rhizomes if you live in a cold climate. (longfield-gardens.com)

We invite you to explore the different colors and sizes available at Longfield Gardens to find the perfect match for your garden style. Whether you go for the fiery oranges of 'Tropicanna' or the classic bronze of 'Wyoming,' you're just a few months away from your own tropical getaway right in your backyard. (longfield-gardens.com)

"The secret to a stunning summer garden isn't about working harder—it's about choosing high-impact plants like cannas that do the heavy lifting for you."

FAQ

How deep should I plant canna rhizomes?

Canna rhizomes should be planted about 4 inches deep. If you are planting them in a container, ensure there is enough room for the roots to grow downward, but the rhizome itself only needs a few inches of soil covering it to stay protected and sprout successfully. (longfield-gardens.com)

Do cannas need to be staked?

Generally, no. Cannas have very thick, sturdy stems that are designed to support their large leaves and flower spikes. However, if you are growing a very tall variety (6+ feet) in a particularly windy spot, you might find that a sturdy bamboo stake provides a bit of extra security. (longfield-gardens.com)

Can cannas grow in water?

Yes, many canna varieties are semi-aquatic and thrive in shallow water or very boggy soil. They are often used as "marginal" plants in garden ponds. If you choose to grow them this way, it is often easier to keep them in a submerged pot so they can be easily moved or lifted in the fall. (longfield-gardens.com)

How long does it take for cannas to bloom?

Once the shoots emerge from the soil, you can typically expect to see the first flowers in about 10 to 12 weeks. If you start your rhizomes indoors a month before the last frost, you can often enjoy blooms by early to mid-July, depending on your local weather and sun exposure. (longfield-gardens.com)