How to Grow Flower Bulbs Canna for a Tropical Garden

Table of Contents

1. Introduction
2. Understanding the Canna Lily
3. Selecting the Best Varieties
4. Finding the Right Place to Plant
5. Timing Your Planting
6. How to Plant Canna Rhizomes
7. Water and Fertilizer Requirements
8. Maintenance and Deadheading
9. Growing Cannas in Containers
10. Common Pests and Challenges
11. Overwintering Canna Rhizomes
12. Designing Your Garden with Cannas
13. Safety for Pets and Children
14. Summary of Success
15. FAQ

Introduction

There is nothing quite like the excitement of seeing the first broad, jungle-like leaves of a canna lily unfurl in the summer sun. These plants bring an instant tropical vacation vibe to any backyard, even if you live far from the equator. At Longfield Gardens, we love how cannas combine architectural foliage with brilliant, butterfly-attracting flowers to create a high-impact display.

This guide is designed for home gardeners who want to master the art of growing these bold summer favorites. We will cover everything from selecting the right varieties and planting at the correct depth to keeping your plants lush and healthy all season long. Whether you have a sprawling garden bed or a sunny apartment balcony, there is a way to make these plants work for you.

Growing cannas is a rewarding experience that yields big results with just a few simple steps. For a broader overview, see our All About Cannas guide. By matching the plant's needs for sun and moisture to your local conditions, you can enjoy a spectacular show from midsummer until the first frost. Canna lilies are a simple way to add dramatic height and vibrant color to your outdoor living space.

Understanding the Canna Lily

While most gardeners refer to them as flower bulbs, canna lilies actually grow from thick, underground stems called rhizomes. These rhizomes store energy and moisture, which helps the plant grow incredibly fast once the weather warms up. Although they are called "lilies," they are more closely related to gingers and bananas than to true lilies.

Cannas are native to the tropical and subtropical regions of the Americas. This heritage means they absolutely love heat and humidity. In USDA hardiness zones 8 through 10, these plants are reliable perennials that can stay in the ground year-round. In cooler northern climates, they are grown as annuals or the rhizomes are lifted and stored indoors for the winter. If you're not sure how your climate compares, the USDA Hardiness Zone Map is a quick reference.

The appeal of the canna is twofold: the foliage and the flowers. The leaves are massive and paddle-shaped, coming in shades of emerald green, deep bronze, or even variegated patterns with stripes of yellow, orange, and white. The flowers sit atop tall stalks in clusters of red, orange, yellow, pink, or cream. They are a favorite of hummingbirds, who find the tubular blooms irresistible.

Selecting the Best Varieties

Choosing the right canna variety depends on where you plan to plant it and what look you want to achieve. Some cannas grow to be six feet tall, while others stay a compact two feet. Here are some popular varieties we often recommend for home gardens.

Bold Foliage Favorites

If you want leaves that make a statement even when the plant isn't blooming, look for variegated or dark-leaved types.

• Bengal Tiger (Pretoria): This is one of the most famous varieties. It features bright green leaves with vivid yellow stripes and glowing orange flowers.
• Tropicanna: This variety is known for its multi-colored leaves that feature stripes of burgundy, gold, and lime green.
• Tropicanna Black: If you want drama, this plant delivers with dark, chocolate-bronze foliage that makes its scarlet flowers pop.
• Wyoming: This variety offers deep purple-bronze leaves and large, ruffled orange flowers.

Classic Green-Leaved Varieties

Standard green foliage provides a clean, lush backdrop for bright flowers.

• Richard Wallace: This variety produces sunny yellow flowers over bright green leaves. It is a classic choice for a bright, cheerful border.
• City of Portland: Known for its beautiful coral-pink blooms, this variety adds a softer touch to the garden.
• Red King Humbert: This tall variety features deep red flowers and can have both green and bronze-tinted leaves.

Compact and Dwarf Varieties

If you are gardening in containers or have a small space, Short Cannas are the way to go. These usually stay under three feet tall but still produce full-sized flowers.

• Tropical Rose: An award-winning dwarf variety with soft pink flowers.
• Tropical Yellow: A compact plant that produces bright, speckled yellow blooms.

Key Takeaway: Always check the mature height of a variety before buying. Taller cannas are perfect for the back of a flower bed, while dwarf varieties are best for the front of a border or in pots.

Finding the Right Place to Plant

Success with canna lilies starts with choosing the right spot in your yard. These plants are not shy about their needs. They want sun, warmth, and plenty of water.

Sun Exposure

Cannas need full sun to perform their best. This means at least six to eight hours of direct sunlight every day. In very hot climates, such as the desert Southwest, they can benefit from a little afternoon shade to prevent the leaves from scorching. However, in most parts of the US, more sun leads to more flowers and brighter foliage colors.

Soil and Drainage

These plants are quite adaptable to different soil types, but they prefer rich, fertile soil that holds moisture well. Unlike many other flower bulbs that rot in wet soil, cannas are very thirsty. They can even grow in damp areas near ponds.

If your soil is very sandy, you should mix in some compost or peat moss before planting to help hold onto water. If you have heavy clay, the plants will usually do just fine as long as the soil isn't so packed that the roots can't spread.

Wind Protection

Because canna leaves are so large, they can sometimes act like sails in the wind. In very windy areas, the leaves may tear or shred along the veins. This does not usually hurt the health of the plant, but it can make it look a bit untidy. If possible, plant them near a fence, a wall, or a group of sturdy shrubs to provide a windbreak.

Timing Your Planting

Timing is everything when it comes to tropical plants. Canna rhizomes are sensitive to cold, so you must be patient in the spring.

The best time to plant your canna rhizomes is when the danger of frost has passed and the soil has warmed up. A good rule of thumb is to wait until you are ready to plant your tomatoes or peppers. The soil temperature should be at least 60°F. If the soil is too cold and wet, the rhizome may sit dormant for a long time or potentially rot. If you're ordering rhizomes, check our Shipping Information.

If you live in a northern state with a short growing season, you can give your cannas a head start by planting them indoors. Start them in pots about four to six weeks before the last expected frost. Keep the pots in a warm, sunny spot. By the time the weather is warm enough to move them outside, you will already have several inches of green growth.

How to Plant Canna Rhizomes

Planting cannas is a straightforward process. For a fuller planting walkthrough, see our How to Plant a Canna Bulb guide. You do not need any special tools beyond a simple garden trowel or spade.

1. Prepare the Soil: Dig a hole about four to six inches deep. If you are planting in a group, it is often easier to dig one large trench rather than individual holes.
2. Position the Rhizome: Look for the "eyes" or small buds on the rhizome. These are the points where the new growth will emerge. Lay the rhizome in the hole horizontally with the eyes facing upward.
3. Spacing: Give these plants plenty of room to grow. Space tall varieties about two feet apart. Dwarf varieties can be spaced about one foot apart. Good airflow between plants helps prevent disease.
4. Cover and Water: Fill the hole with soil and gently press down with your hands. Water the area thoroughly right after planting to settle the soil around the rhizome.

What to do next:

• Mark the spot where you planted your cannas so you don't accidentally dig them up before they sprout.
• Check the soil every few days to ensure it stays moist but not soggy while the plant is getting established.
• Watch for the first pointed green shoots to emerge, which usually happens within two to three weeks in warm weather.

Water and Fertilizer Requirements

Cannas are "heavy feeders," meaning they need a lot of energy to grow so fast and bloom so much. They also require more water than most other garden perennials.

Watering Tips

Once the plants are growing actively, they should never be allowed to dry out completely. During the heat of the summer, you may need to water them every few days. If the edges of the leaves begin to turn brown and crispy, it is often a sign that the plant is thirsty.

For cannas in the ground, deep watering once or twice a week is usually better than a light sprinkling every day. This encourages the roots to grow deep into the soil. If you are growing cannas in containers, you will likely need to water them every single day during July and August.

Feeding Your Plants

To keep the foliage lush and the flowers coming, apply a balanced fertilizer once a month during the growing season. You can use a standard 10-10-10 garden fertilizer or one designed for flowering plants. Always follow the instructions on the product label. If you prefer organic methods, mixing compost or well-rotted manure into the soil at planting time provides a great slow-release food source.

Maintenance and Deadheading

Cannas are relatively low-maintenance, but a little bit of grooming goes a long way. This keeps the garden looking tidy and encourages the plant to put its energy into more blooms rather than seed production.

Deadheading Flowers

As the individual flowers in a cluster fade, you can simply pinch them off. Once the entire flower stalk has finished blooming and no more buds are visible, cut the stalk back to where it meets the next leaf. This often encourages a second or third flush of flowers to emerge from lower down on the plant.

Removing Old Foliage

During the summer, the lower leaves may occasionally turn yellow or become damaged. You can simply cut these off at the base of the stem to keep the plant looking fresh. This also improves airflow around the base of the plant.

Growing Cannas in Containers

If you have limited garden space or want to decorate a patio, cannas are excellent container plants. For compact plants, browse our Short Cannas collection. Their upright growth habit makes them a perfect "thriller" for the center of a large pot.

Choosing the Right Pot

Cannas grow large and can become top-heavy. Use a heavy pot made of ceramic or stone to prevent it from tipping over in the wind. A pot that is 15 to 18 inches in diameter is a good size for a single tall canna or three dwarf cannas. For more on container spacing, see How Many Canna Bulbs Per Pot? Ensure the pot has a drainage hole at the bottom.

Potting Mix

Use a high-quality potting soil rather than garden soil. Potting soil is lighter and designed to provide the right balance of drainage and moisture retention. Because pots dry out quickly, you might want to look for a mix that contains water-retaining crystals or extra organic matter.

Container Care

Plants in containers use up nutrients quickly. We recommend using a water-soluble fertilizer every two weeks for container-grown cannas. This ensures they have a steady supply of food to keep blooming all summer long.

Common Pests and Challenges

While cannas are generally very sturdy, they do have a few common visitors you should know how to manage.

Canna Leafrollers

The most common pest for these plants is the canna leafroller. This is a small caterpillar that sews the edges of the leaf together before it unfurls, living and eating inside the roll. If you see leaves that look stuck together or have rows of holes when they open, you likely have leafrollers.

• The Fix: You can unroll the leaf by hand and remove the caterpillar. For larger infestations, some gardeners use a biological control like Bacillus thuringiensis (Bt), which is a naturally occurring soil bacterium that targets caterpillars. Consult your local extension office for specific product recommendations in your area.

Slugs and Snails

Because cannas love moisture and have large, tender leaves, they can sometimes attract slugs and snails, especially early in the season.

• The Fix: Keep the area around the base of the plants clear of debris. You can use copper tape or slug bait if they become a major problem.

Japanese Beetles

In midsummer, Japanese beetles may stop by to snack on the flowers.

• The Fix: The easiest way to handle these is to knock them off the plant into a bucket of soapy water in the early morning when they are less active.

Overwintering Canna Rhizomes

In zones 7 and colder, canna rhizomes will not survive a hard freeze in the ground. However, you do not have to buy new ones every year. Saving them is a simple process. For a step-by-step storage walkthrough, see Storing Canna Lily Bulbs Over Winter.

When to Dig

Wait until the first frost has blackened the foliage. This signal tells the plant to go dormant. Cut the stems back to about three or four inches above the ground.

Lifting and Cleaning

Use a garden fork to gently lift the clump of rhizomes out of the soil. Be careful not to bruise or cut the rhizomes. Shake off the excess soil and let them sit in a dry, shaded area for a day or two to dry out. Do not wash them with water, as this can encourage rot during storage.

Storing for Winter

Place the rhizomes in a cardboard box or a plastic bin with ventilation holes. Cover them with peat moss, vermiculite, or dry sawdust. This keeps them from drying out completely while still allowing them to "breathe." Store the box in a cool, dark, dry place that stays between 40°F and 50°F. An unheated basement or a crawl space is usually perfect. Check on them once or twice during the winter; if they look shriveled, you can lightly mist the packing material with a little water.

Key Takeaway: Success in overwintering comes down to temperature. If the storage area is too warm, the rhizomes may sprout too early. If it is too cold, they may freeze and die.

Designing Your Garden with Cannas

Cannas are versatile design elements. For more inspiration, see our Fresh Ideas for Growing Cannas. They work well in many different garden styles, from formal to eclectic.

Creating a Tropical Screen

Because they grow tall and thick, Tall Cannas are great for creating temporary summer privacy. Plant a row of tall varieties along a patio or a property line to create a living wall of color.

Color Echoing

Try "color echoing" by matching the flower or leaf color of your canna to other plants nearby. For example, plant orange-flowered cannas near purple salvias for a high-contrast look. Or, pair bronze-leaved cannas with dark-leaved sweet potato vines for a sophisticated, moody container.

Water Features

If you have a pond or a rain garden, cannas are a natural fit. They love the extra moisture and their reflection in the water is stunning. You can even grow some varieties in pots partially submerged in water.

Safety for Pets and Children

When choosing plants for your home, safety is always a priority. Canna lilies are generally considered non-toxic to dogs, cats, and horses. This makes them a great choice for pet owners who want a lush garden without the worry. However, as with any plant, ingesting large amounts of foliage can cause mild stomach upset. It is always a good idea to keep an eye on curious pets and prevent them from chewing on your garden plants.

Summary of Success

Growing canna lilies is one of the easiest ways to bring a big, bold look to your summer garden. By focusing on the few things they need most—sun, water, and heat—you can ensure a successful growing season. Longfield Gardens is here to help you get started with high-quality rhizomes and the 100% Quality Guarantee you need to see them thrive.

• Plant after the frost: Wait for warm soil and air temperatures.
• Feed and water regularly: These are thirsty, hungry plants.
• Give them sun: Full sun produces the best colors and most flowers.
• Save for next year: Lift the rhizomes in the fall to enjoy them again next spring.

We want every gardener to feel the pride of a beautiful, blooming yard. With cannas, that success is within reach for everyone, regardless of their experience level. Simply pick your favorite colors, find a sunny spot, and watch the tropical magic happen.

FAQ

Do cannas need to be deadheaded?

While it is not strictly necessary for the health of the plant, deadheading helps the garden look tidy. Removing spent blooms prevents the plant from putting energy into seed pods and can encourage it to produce more flowers throughout the season.

Can I grow cannas in the shade?

Cannas can survive in partial shade, but they will not grow as tall or bloom as vigorously. In shaded spots, the foliage color of variegated varieties may also become more muted. For the best results, aim for at least six hours of direct sunlight.

How long does it take for cannas to bloom after planting?

Most cannas will begin to bloom about 10 to 12 weeks after they are planted in the ground. If you start your rhizomes indoors early, you can enjoy flowers much sooner in the summer.

Why are my canna leaves turning brown on the edges?

Brown, crispy leaf edges are usually a sign of "leaf scorch." This often happens when the plant is not getting enough water during hot, dry weather. Increase your watering frequency to keep the soil consistently moist.