Growing The Canna Perennial Bulb For Tropical Color

Table of Contents

1. Introduction
2. Understanding the Canna Perennial Bulb
3. Choosing the Right Location for Success
4. When to Plant Your Canna Rhizomes
5. How to Plant Canna Perennial Bulbs
6. Summer Care for Vibrant Blooms
7. Top Canna Varieties to Consider
8. Using Cannas in Your Landscape Design
9. Managing Pests and Common Challenges
10. Overwintering: Keeping Your Perennials Year After Year
11. Dividing Cannas for More Plants
12. Conclusion
13. FAQ

Introduction

There is nothing quite like the feeling of watching a canna lily unfurl its massive, banana-like leaves for the first time in early summer. These plants bring an immediate tropical flair to any backyard, turning a standard garden bed into a lush, private oasis. At Longfield Gardens, we want to help you experience the joy of growing these canna lilies in your own landscape. Whether you have a sprawling garden or a small sunny balcony, these plants offer incredible rewards for very little effort.

In this guide, we will focus on everything you need to know about the canna perennial bulb. We will cover how to choose the right varieties, where to plant them for the best results, and how to care for them so they return year after year. Understanding these basics is the simplest way to ensure your garden stays vibrant from midsummer through the first frost. Canna lilies are a rewarding choice for gardeners of all skill levels who want bold color and architectural height. For a broader overview, see All About Cannas.

Understanding the Canna Perennial Bulb

While many gardeners call them "bulbs," cannas actually grow from thick, underground stems known as rhizomes. A rhizome is a specialized storage organ that holds energy for the plant. It grows horizontally just beneath the soil surface, sending out roots from the bottom and new shoots from the "eyes" on top. Because they store so much energy, cannas are incredibly fast growers once the weather warms up.

In tropical climates, these plants are true perennials that stay in the ground all year. In most parts of the United States, we treat them as tender perennials. This means they can live for many years if they are protected from freezing temperatures. If you live in a warm region, they will come back on their own. If you live in a cooler region, you can easily dig them up and store them for the winter. This versatility is part of why they are so popular in American gardens.

The beauty of the canna perennial bulb lies in its two-fold appeal. Most varieties offer stunning, brightly colored flowers in shades of red, orange, yellow, and pink. However, the foliage is often just as decorative. You can find varieties with deep burgundy leaves, bright green leaves, or even striped patterns. This makes them a "two-for-one" plant that provides visual interest even when the flowers are not in bloom.

Choosing the Right Location for Success

Getting the location right is the most important step in growing healthy cannas. These plants are native to the tropics, so they crave two things above all else: heat and sunlight. When you are picking a spot in your yard, look for the area that gets the most direct sun throughout the day.

Sunlight Requirements

For the most vibrant flowers and the strongest stems, your cannas need at least six to eight hours of full sun. While they can grow in partial shade, you will likely notice fewer blooms and the stems may become "leggy" as they reach for the light. If you live in an extremely hot climate, such as the desert Southwest, a little afternoon shade can actually help the foliage from getting scorched, but full sun is generally the standard for success.

Soil and Drainage

Cannas are not overly picky about soil type, but they do best in soil that is rich in organic matter. If your soil is very sandy or heavy clay, you can improve it by adding a few inches of compost or well-rotted manure before planting. This helps the soil hold the right amount of moisture while still allowing excess water to drain away.

Unlike many other bulbs that prefer to stay dry, cannas are quite thirsty. Once they are actively growing, they can even handle "wet feet" and are often used near ponds or in rain gardens. However, before they sprout, the rhizomes can rot if they sit in cold, soggy soil. Make sure your planting area has good drainage so the rhizomes stay healthy while they are waking up from dormancy.

Key Takeaway: Choose a sunny, warm spot with rich soil to give your cannas the best possible start. Sunlight is the "fuel" that drives their rapid growth and brilliant flowering.

When to Plant Your Canna Rhizomes

Timing is everything when it comes to planting cannas. Because they are tropical plants, they have no tolerance for frost. If you plant them too early in cold, damp soil, the rhizomes may simply sit and rot before they ever have a chance to grow.

We recommend waiting to plant your cannas until the danger of frost has completely passed. A good rule of thumb is to wait until your soil temperature reaches at least 60°F. If you have already planted your tomatoes or peppers, it is usually safe to plant your cannas. In most parts of the US, this happens between late April and early June.

If you live in a northern climate with a short growing season, you can give your plants a head start. About four to six weeks before the last frost, plant your rhizomes in pots indoors. Keep them in a warm, sunny window and water them lightly. By the time the weather warms up, you will have established plants ready to go into the garden, which results in earlier blooms.

How to Plant Canna Perennial Bulbs

Planting cannas is a straightforward process that takes only a few minutes. Because the rhizomes are large and sturdy, they are easy to handle and difficult to plant "wrong."

Step-by-Step Planting Guide

1. Prepare the hole: Dig a hole about 4 inches deep. If you are planting multiple cannas, space them 12 to 24 inches apart. Taller varieties need more space to spread out, while dwarf varieties can be planted closer together.
2. Position the rhizome: Look for the "eyes" or small bumps on the rhizome. These are the growth points. Lay the rhizome horizontally in the hole with the eyes facing upward. If you cannot tell which side is up, don’t worry—the plant will figure it out and grow toward the light.
3. Cover with soil: Fill the hole back in with soil and gently press down with your hands to remove any large air pockets.
4. Water lightly: Give the area a light watering to settle the soil. Avoid overwatering at this stage; you want the soil to be moist but not saturated until you see green shoots poking through the ground.

Once you see the first leaves appearing, you can begin to water more regularly. Canna growth is exponential—they may start slowly, but once the heat of summer hits, they can grow several inches in a single week.

What to Do Next

• Check the weather forecast to ensure no late frosts are expected.
• Amend your soil with compost to provide a nutrient boost.
• Mark the spot where you planted them so you don't accidentally dig them up before they sprout.
• Increase watering once the first green shoots are visible.

Summer Care for Vibrant Blooms

Canna lilies are relatively low-maintenance, but a little bit of attention during the peak of summer will keep them looking their best. If you provide them with enough water and food, they will reward you with a non-stop display of color.

Watering and Mulching

Cannas are "hungry" for water. During the hottest weeks of July and August, they may need to be watered two or three times a week if there is no rain. If the leaves start to roll up or look wilted, it is a sign the plant is thirsty. Adding a two-inch layer of mulch around the base of the plants is a great way to keep moisture in the soil and prevent weeds from competing for nutrients.

Fertilizing for Success

Because cannas grow so much biomass in a single season, they are "heavy feeders." We suggest applying a balanced, slow-release fertilizer at planting time. Once the plants are about a foot tall, you can follow up with a monthly application of a water-soluble fertilizer. This ensures the plant has the energy to keep producing those large, exotic flowers all summer long.

Deadheading and Pruning

"Deadheading" is the process of removing spent flowers. On a canna plant, the flowers grow in clusters at the top of the stalk. When an individual flower fades, you can simply pinch it off. Once the entire cluster has finished blooming, cut the flower stalk down to the next leaf. This encourages the plant to put its energy into new flower spikes rather than producing seeds.

If a leaf becomes torn by wind or starts to look ragged, do not be afraid to trim it off. Cannas are very resilient. You can even cut a plant back significantly in mid-summer if it looks unhealthy, and with a little water and fertilizer, it will often grow back fresh and beautiful within weeks.

Key Takeaway: Consistency is key. Regular water and monthly feeding are the two simple secrets to keeping your canna lilies lush and productive until autumn.

Top Canna Varieties to Consider

At Longfield Gardens, we offer a selection of cannas that have been tested for performance and beauty. Choosing the right variety depends on the look you want to achieve in your landscape.

Tall and Dramatic Varieties

If you want to create a privacy screen or a bold backdrop for other flowers, look for Tall Cannas that reach five to six feet in height.

• 'Red King Humbert': This is a classic favorite known for its dark, bronze-toned foliage and bright red flowers. The contrast between the dark leaves and the fiery blooms is truly spectacular.
• 'Wyoming': This variety features beautiful orange flowers and deep purple-green leaves. It is a vigorous grower that adds a sophisticated touch to the garden.
• Pretoria (also known as 'Bengal Tiger'): This is one of the most famous cannas. Its leaves are striped with bright green and yellow, making it a standout even when it isn't blooming. It produces lovely orange flowers that attract hummingbirds.

Compact and Dwarf Varieties

For containers or the front of a garden bed, Short Cannas are an excellent choice. These typically stay between two and three feet tall but still offer the same large flowers and lush leaves.

• City of Portland: This variety produces soft pink blooms over bright green foliage. It is a wonderful choice for adding a more delicate color palette to a sunny patio.
• The President: This is a time-tested variety with traditional green leaves and large, scarlet-red flowers. It stays at a manageable height, making it perfect for smaller spaces.
• Lucifer: A striking dwarf variety with red flowers edged in bright yellow. It is highly attractive to pollinators and adds a playful pop of color to pots.

Using Cannas in Your Landscape Design

Cannas are incredibly versatile in the garden. Because they have such a strong vertical presence, they can be used as "architectural" plants that provide structure to your design.

Creating a Privacy Screen

If you have a fence line or a patio that feels a bit too exposed, a row of tall cannas can create a living privacy screen in just a few months. Plant them about 18 inches apart in a long row. By mid-July, the large leaves will overlap, creating a dense wall of foliage that blocks the view and adds a sense of seclusion to your outdoor space.

Container Gardening

Cannas are excellent for large pots and planters. A single canna can serve as the "thriller" in a mixed container, surrounded by "fillers" like lantana and "spillers" like sweet potato vine. When planting in pots, make sure the container is at least 15 to 18 inches in diameter. For more container tips, see How to Grow Summer Bulbs in Containers.

Companion Planting

Cannas look best when paired with plants that have different textures. The broad, smooth leaves of a canna perennial bulb provide a great contrast to the fine, feathery foliage of ornamental grasses or the delicate blooms of perennials like salvia and coreopsis. They also pair beautifully with other tropical-looking plants like elephant ears, hibiscus, and caladiums.

Managing Pests and Common Challenges

One of the reasons we love cannas is that they are generally very healthy and resistant to most pests. However, there are a few things to keep an eye on to ensure your plants stay in top shape.

Canna Leafrollers

In some regions, you might notice the leaves of your cannas staying rolled up or having small holes in them. This is often caused by the canna leafroller, a small caterpillar that uses silk to keep the leaf shut while it feeds inside. If you see this, you can simply unroll the leaf and remove the caterpillar by hand. For larger displays, an organic spray containing Bacillus thuringiensis (Bt) can be very effective if applied according to the label instructions.

Slugs and Snails

Because cannas like moist environments, slugs and snails can sometimes be attracted to the young, tender shoots in the spring. You can manage this by keeping the area around the base of the plants free of debris or by using a pet-safe slug bait if necessary. Once the plants are established and the leaves are higher off the ground, slugs are rarely a significant problem.

Leaf Scorch

If the edges of your canna leaves look brown and crispy, it is usually a sign of environmental stress rather than a disease. This often happens if the plant is not getting enough water or if it is being hit by strong, drying winds. Increasing your watering schedule and ensuring the soil is well-mulched will usually solve this issue quickly.

Overwintering: Keeping Your Perennials Year After Year

This is the most common question we receive about the canna perennial bulb: "Will it come back next year?" The answer depends on where you live and how much effort you want to put in.

Perennial Success in Warm Zones

If you live in USDA Hardiness Zones 8 through 11, cannas are generally hardy and can stay in the ground year-round. If you are not sure whether your area falls into this range, the Hardiness Zone Map can help. After the first frost kills the foliage, simply cut the stalks down to about two or three inches above the ground. You can add a layer of mulch over the top for extra protection. In the spring, when the soil warms up, the rhizomes will sprout new growth and start the cycle all over again.

Lifting and Storing in Cold Zones

If you live in Zone 7 or colder, the ground will likely freeze deep enough to kill the rhizomes. To keep your favorite varieties, you will need to "lift" them for the winter. This is a simple process that allows you to enjoy the same plants for many years. For a step-by-step version, see Storing Canna Lily Bulbs Over Winter: A Simple Guide.

1. Wait for the frost: Let the first light frost blacken the foliage. This sends a signal to the plant to go dormant and store its energy in the rhizome.
2. Cut them back: Cut the stalks down to about 4 inches.
3. Dig them up: Use a garden fork or shovel to carefully lift the clump of rhizomes out of the ground. Be careful not to slice into the rhizomes.
4. Clean and dry: Shake off the excess soil. You do not need to wash them; in fact, a little bit of soil can help keep them from drying out too much. Let them sit in a dry, shaded area for a couple of days to cure.
5. Store for winter: Place the rhizomes in a cardboard box or a plastic bin with holes for ventilation. Cover them with slightly damp peat moss, vermiculite, or sawdust. Store the box in a cool, dark place that stays between 45°F and 55°F, such as a basement or crawl space.

Check on your stored rhizomes once or twice during the winter. If they look shriveled, mist them lightly with water. If any spots look soft or rotten, remove those pieces to keep the rest of the clump healthy. When spring returns, you can divide the clumps and plant them out again.

Dividing Cannas for More Plants

One of the best things about the canna perennial bulb is that it multiplies. A single rhizome planted in the spring will often grow into a large clump by the end of the season. Dividing these clumps is an easy way to get more plants for free. For more on multiplying clumps, see How to Split Canna Bulbs: A Guide to More Flowers.

The best time to divide cannas is in the spring before planting. If you have stored your rhizomes over the winter, take them out of storage and look for the individual sections. Each section that you plant should have at least one or two "eyes" (growth points). You can simply pull the rhizomes apart with your hands or use a clean, sharp knife to cut them into pieces.

By dividing your cannas every two or three years, you prevent the clumps from becoming overcrowded. Overcrowded cannas may produce smaller flowers or have less vigorous growth. Sharing your extra divisions with friends and neighbors is a great way to spread the beauty of these tropical plants.

Conclusion

Growing canna lilies is a rewarding way to add high-impact color and a tropical feel to your home landscape. Whether you treat them as a permanent fixture in a warm climate or a seasonal guest in a northern garden, their ease of care and reliable performance make them a favorite for us at Longfield Gardens. By following the simple rules of sun, water, and proper planting depth, you can enjoy a stunning display of flowers and foliage that lasts for months.

• Plant rhizomes in full sun after the soil has warmed to 60°F.
• Provide consistent moisture and monthly fertilizer for the best blooms.
• Deadhead spent flowers to encourage continuous growth throughout the season.
• In cold climates, lift and store the rhizomes in a cool, dry place for the winter.

We are confident that once you experience the bold beauty of cannas, they will become a staple in your summer garden. Start with a few of our favorite varieties this season and watch your garden transform into a tropical retreat.

FAQ

Are canna lilies perennials or annuals?

Cannas are technically tropical perennials. In warm climates (Zones 8-11), they stay in the ground and return every year on their own. In colder climates (Zones 3-7), they will not survive the winter outdoors, so gardeners either treat them as annuals and buy new them each year or dig up the rhizomes to store them indoors for the winter.

How deep should I plant canna bulbs?

Canna rhizomes should be planted approximately 4 inches deep. You want to cover the rhizome with 2 to 3 inches of soil. This depth provides enough protection for the roots while still allowing the sun to warm the soil around the growth points, which helps the plant sprout more quickly.

When will my canna lilies start to bloom?

Cannas typically begin blooming in mid-to-late summer, usually about 10 to 12 weeks after planting. The exact timing depends on the weather and the variety. Once they start blooming, they will continue to produce new flower spikes until the first frost of autumn kills the foliage.

Can canna lilies grow in pots?

Yes, cannas are excellent container plants. Smaller or "dwarf" varieties are particularly well-suited for pots, as they stay compact and are less likely to tip over in the wind. Ensure your container has drainage holes and use a high-quality potting mix, as container plants require more frequent watering and fertilizing than those in the ground.