Introduction
Imagine transforming your backyard into a lush, tropical oasis with just a few simple steps. Canna flower bulbs, which grow from thick underground stems called rhizomes, are the secret to adding bold texture and vibrant color to your summer garden. These plants are beloved for their massive, paddle-shaped leaves and orchid-like flowers that bloom from midsummer until the first frost.
At Longfield Gardens, we enjoy helping gardeners discover how easy it is to grow these spectacular tropical plants. Whether you have a sprawling landscape or a small balcony, there is a variety that will fit your space perfectly. If you want a ready-made mix, try the Canna Assorted Mix - Bulk Offer.
We will cover everything from choosing the right site to overwintering your plants so they return year after year. By focusing on a few gardening basics, you can enjoy a season full of dramatic foliage and bright blooms. To shop by plant height, start with our Tall Cannas.
Growing cannas is a rewarding way to elevate your garden’s style with very little stress.
Getting to Know Canna Flower Bulbs
Cannas are often called canna lilies, but they are not actually true lilies. They are more closely related to ginger and bananas. This relationship is easy to see when you look at their large, tropical leaves. In the gardening world, we refer to the "bulbs" as rhizomes. These are thick, fleshy structures that store energy to produce tall stems and beautiful flowers.
These plants are native to tropical and subtropical regions. Because of this, they thrive in heat and humidity. While they are tropical by nature, they are very adaptable. You can grow them as perennials in warm climates or as fast-growing annuals in cooler northern zones. Their ability to grow quickly makes them one of the most satisfying choices for summer color.
One of the best things about canna flower bulbs is their versatility. Some varieties grow as tall as six or eight feet, creating a natural privacy screen. Others are dwarf varieties that stay under three feet, making them ideal for pots and the front of flower beds. The flowers come in shades of red, orange, yellow, and pink, often with striking speckles or borders.
Choosing the Right Variety for Your Garden
Before you start planting, it is helpful to think about the look you want to achieve. Cannas offer variety not just in their flowers, but also in their foliage. Some leaves are a bright, clear green, while others are deep bronze or even variegated with stripes of yellow and white.
Tall Varieties for Drama and Privacy
If you have a large space or want to hide an unsightly fence, tall varieties are an excellent choice. These can reach heights of five to eight feet in a single season. The "Musifolia" type is famous for its enormous green leaves that resemble banana foliage. For another tall, eye-catching option, Canna Tall Tropicanna has bold striped foliage.
Dwarf Varieties for Smaller Spaces
For those with smaller gardens or large patio containers, Short Cannas are the perfect solution. These typically reach about two to three feet in height. They pack all the tropical punch of their larger cousins into a more manageable size. They are particularly effective when planted in groups of three or five to create a dense mound of color.
Foliage-Focused Cannas
Sometimes the leaves are the main event. Varieties with bronze or burgundy foliage, like the Canna Tall Australia type, provide a beautiful contrast to green-leaved plants. Variegated varieties offer even more interest with multi-colored patterns. Choosing a mix of foliage types ensures your garden looks beautiful even when the plants are not in bloom.
Finding the Perfect Planting Site
Success with canna flower bulbs starts with picking the right spot. Like most tropical plants, they have a few specific preferences that help them grow their best.
The Importance of Sunlight
Cannas are sun-worshippers. To get the best flowers and the most vibrant leaf colors, they need full sun. This means a spot that gets at least six to eight hours of direct sunlight each day. While they can grow in partial shade, they will likely produce fewer flowers and may become "leggy" as they stretch toward the light.
Soil and Drainage
These plants are not very picky about soil type, but they do best in soil that is rich in organic matter. "Drainage" is a term gardeners use to describe how fast water leaves the soil. While cannas love moisture, they do not like to sit in stagnant, soggy water for long periods.
If your soil is very heavy clay, you can improve it by adding compost or well-rotted manure. This helps create a loose texture that allows roots to grow easily. In our trial garden at Longfield Gardens, we have found that adding a layer of mulch after planting helps keep the soil moisture consistent, which these plants love.
Space to Grow
Because cannas can grow quite large, they need plenty of "elbow room." Taller varieties should be spaced about two feet apart. Dwarf varieties can be spaced about one foot apart. Giving them enough space ensures that air can circulate around the leaves, which keeps the plants healthy. For more spacing guidance, see our How Far Apart Should You Plant Canna Bulbs? Expert Tips.
Key Takeaway: For the most impressive display, choose the sunniest spot in your yard and ensure the soil is rich and well-drained.
When to Plant Your Canna Rhizomes
Timing is everything when it comes to tropical plants. Because cannas are sensitive to cold, you must wait for the right weather conditions before putting them in the ground.
Waiting for Warm Soil
It is tempting to plant as soon as the first green buds appear in spring, but patience pays off. Canna flower bulbs should be planted outdoors only after the danger of frost has passed and the soil has warmed up. A good rule of thumb is to wait until the same time you would plant tomatoes or peppers. In most regions, this is late spring or early summer.
If you plant them in cold, wet soil, the rhizomes may stay dormant for a long time or even rot. They really begin to take off when the soil temperature reaches about 65°F. If you want to get a head start, you can start your cannas indoors in pots about four to six weeks before the last frost date. For more timing tips, see our When Should I Plant Canna Lily Bulbs? Best Timing Guide.
Shipping and Arrival
When you order from us, we time our shipping based on your USDA hardiness zone. This ensures your bulbs arrive about two weeks before the ideal planting time for your specific area. For more details, see our Shipping Information. When your package arrives, open it immediately to let the rhizomes breathe. If you aren't ready to plant, keep them in a cool, dry place away from direct sunlight.
How to Plant Canna Flower Bulbs
Planting cannas is a straightforward process. You do not need any special tools—just a trowel and a bit of enthusiasm. For planting-depth details, see our How Deep to Plant a Canna Bulb: A Guide for Big Blooms.
Step-by-Step Planting
- Prepare the hole: Dig a hole about four to six inches deep. If you are planting multiple rhizomes, space the holes 12 to 24 inches apart depending on the variety.
- Position the rhizome: Look at the rhizome for small bumps or "eyes." These are the growing points where the stems will emerge. Place the rhizome in the hole horizontally with the eyes facing up. If you cannot tell which side is up, don't worry—the plant will figure it out and grow toward the light.
- Cover with soil: Fill the hole with soil and gently press down with your hands to remove any large air pockets.
- Water thoroughly: Give the area a good soak immediately after planting. This "settles" the soil around the rhizome and wakes the plant up.
Planting in Containers
Cannas are excellent choices for pots, and Canna Short Pink Magic is a great compact option. Use a container with drainage holes in the bottom to prevent water from pooling. A standard potting mix works perfectly. Plant the rhizome about four inches deep. Because pots dry out faster than the ground, you may need to water your container-grown cannas more frequently during the heat of summer.
What to do next:
- Check your local frost dates to determine your planting window.
- Clear the planting area of any weeds or large stones.
- Enrich the soil with a few shovels of compost if needed.
- Mark the spot with a garden stake so you remember where they are planted.
Caring for Your Cannas During the Growing Season
Once your cannas are tucked into the ground, they are relatively low-maintenance. However, a little extra attention can lead to even bigger leaves and more frequent flowers.
Watering Correctly
Cannas are "thirsty" plants. Unlike some bulbs that prefer to stay on the dry side, cannas enjoy consistent moisture. During the hottest parts of the summer, check the soil regularly. If the top inch of soil feels dry, it is time to water.
When you water, do so deeply. This encourages the roots to grow further down into the soil, making the plant more stable and drought-resistant. If you are growing cannas in a very hot climate, they may even enjoy being planted near a water feature or in a spot where the soil stays naturally damp.
Feeding Your Plants
Because cannas grow so much foliage in a single season, they are heavy feeders. They appreciate a boost of nutrients to keep them going. You can use a balanced, all-purpose fertilizer once a month during the growing season. Follow the instructions on the product label for the correct amount. A fertilizer that is slightly higher in phosphorus can help encourage more prolific blooming.
Deadheading for More Blooms
"Deadheading" is the process of removing flowers after they have faded. For cannas, this is a great way to keep the plant looking tidy. Once a flower spike has finished blooming, you can cut the individual spent flowers off. For more season-by-season guidance, read our How to Care for Canna Bulbs: A Complete Seasonal Guide.
Often, a second flower spike will emerge from the same stem just below the first one. Once the entire stalk has finished blooming and no more buds are visible, you can cut that stalk down to the next set of leaves. This tells the plant to put its energy into new growth rather than making seeds.
Managing Common Garden Challenges
Cannas are generally very robust and healthy. They are often ignored by deer, which makes them a great choice for areas where wildlife is a concern. However, there is one common visitor you should know about.
Canna Leafrollers
In some regions, especially in the south, you might notice the leaves of your cannas staying rolled up or appearing chewed. This is usually the work of canna leafrollers, which are the larvae of certain butterflies or moths. They use silk to stitch the leaf into a tube for protection.
The easiest way to handle this is to keep an eye on your plants early in the season. If you see a rolled leaf, you can often gently open it and remove the caterpillar. Keeping your garden clean and removing old foliage at the end of the year also helps reduce the number of pests that overwinter in the garden. Most of the time, the damage is purely cosmetic and won't hurt the overall health of the plant.
Understanding Hardiness Zones and Longevity
Whether your canna flower bulbs come back every year depends on where you live. The United States is divided into USDA hardiness zones based on average winter temperatures. Our Hardiness Zone Map can help you find yours.
Cannas as Perennials (Zones 8-10)
In warm climates like the southern US, cannas are perennials. This means they can stay in the ground all year long. After the foliage dies back in the winter, you can simply cut the stems to the ground and cover the area with a little mulch. New growth will pop up again when the weather warms in the spring.
Cannas as Annuals (Zones 3-7)
In cooler northern climates, the ground freezes deep enough to damage the rhizomes. In these areas, most gardeners treat cannas as annuals—planting new ones each year—or they "lift" the bulbs in the fall to store them indoors.
How to Overwinter Canna Rhizomes
If you live in a cold climate and want to save your favorite canna varieties for next year, the process is quite simple.
- Wait for the frost: Let the first frost of autumn kill the foliage. The leaves will turn brown or black. This is a signal that the plant is going dormant.
- Cut them back: Cut the stems down so only two or three inches remain above the ground.
- Dig them up: Carefully use a garden fork or spade to lift the rhizomes out of the ground. Be careful not to bruise or cut the fleshy parts.
- Clean and dry: Shake off the excess soil. Let the rhizomes sit in a dry, shaded area (like a garage or porch) for a few days to "cure."
- Pack for storage: Place the dry rhizomes in a box filled with slightly damp peat moss, perlite, or wood shavings. This keeps them from drying out completely.
- Store in a cool spot: Keep the box in a cool, dark place where the temperature stays between 40°F and 50°F. An unheated basement or crawl space is often perfect.
Check on your stored rhizomes once or twice during the winter. If they look shriveled, you can lightly mist the packing material with water. In the spring, you can divide the larger rhizomes and start the planting process all over again.
Key Takeaway: Overwintering cannas is a budget-friendly way to expand your garden. One large rhizome can often be divided into several smaller ones after a single season of growth.
Design Ideas for Your Tropical Garden
Cannas are true "statement plants." Their bold look can be used in several ways to enhance your landscape design.
Create a Tropical Border
Plant a row of tall cannas at the back of a flower bed. In front of them, add plants with contrasting textures, like fine-leafed ornamental grasses or airy perennials. The contrast between the massive canna leaves and the delicate textures of other plants creates a professional, layered look.
Vibrant Container Displays
A single canna in a large pot can be a stunning focal point on a patio or next to a front door. You can surround the base of the canna with "spiller" plants like sweet potato vine or trailing petunias. This creates a "thriller, filler, spiller" arrangement that looks lush and full all summer long.
Attract Pollinators
If you love watching hummingbirds and bees, cannas are a must-have. The bright, tubular flowers are perfectly shaped for hummingbirds, who are often seen visiting the red and orange varieties. Watching these birds dart between the tropical blooms adds an extra layer of enjoyment to your gardening experience.
Privacy Screens
Because they grow so quickly, cannas are an excellent temporary privacy screen. If you have a patio that feels a bit too exposed during the summer, a line of tall cannas can create a living wall of green and color in just a couple of months.
Conclusion
Canna flower bulbs are one of the most rewarding additions you can make to your summer garden. They offer an unmatched combination of giant, colorful foliage and exotic flowers that last for months. By providing them with plenty of sun, consistent water, and a bit of rich soil, you can achieve professional-looking results with very little effort.
At Longfield Gardens, our goal is to help you feel confident in your garden, backed by our 100% Quality Guarantee.
- Choose a sunny spot with well-drained soil.
- Plant after the soil is warm in late spring.
- Keep the plants hydrated and well-fed throughout the summer.
- In cold climates, lift the rhizomes after the first frost to save them for next year.
Gardening is meant to be a joyful and relaxing activity. With cannas, the fast growth and bold colors make every step of the process feel like a big win for your landscape.
FAQ
When should I plant my canna flower bulbs?
You should plant canna rhizomes outdoors in the spring once the danger of frost has passed and the soil has warmed. In most areas, this aligns with the time you would plant warm-weather vegetables like tomatoes. If you want earlier blooms, you can start them indoors in pots about a month before the last frost date.
Do canna lilies need full sun to bloom?
Yes, cannas perform their best in full sun, which means at least six to eight hours of direct light each day. While they can grow in partial shade, they may produce fewer flowers and their leaf colors might not be as vibrant. Sunlight provides the energy they need to produce those large, tropical leaves and tall flower spikes.
Can I grow cannas in pots or containers?
Cannas are excellent for containers and thrive in them as long as the pot is large enough. Use a pot with drainage holes and high-quality potting soil. Because container soil dries out faster than the ground, be sure to check the moisture levels frequently during hot summer days.
How do I store canna bulbs over the winter?
In colder climates (Zones 7 and below), you should lift the rhizomes after the first frost kills the foliage. Cut the stems back, dig up the rhizomes, and let them dry for a few days. Store them in a box with peat moss or wood shavings in a cool, dark place that stays between 40°F and 50°F until spring.
