Table of Contents
- Introduction
- Choosing the Right Cannas for Your Space
- When to Plant Cannas
- Finding the Best Location
- How to Plant Canna Rhizomes Step-by-Step
- Essential Care for Vibrant Blooms
- Managing Cannas in Containers
- Overwintering and Storage
- Encouraging More Blooms
- Designing with Cannas
- Conclusion
- FAQ
Introduction
Imagine stepping into your backyard and being greeted by towering, vibrant leaves and flowers so bold they look like they belong in a Caribbean resort. That is the magic of cannas. These spectacular plants, often called canna lilies, are the heavy hitters of the summer garden. They bring height, texture, and an undeniable energy to any space they inhabit. Whether you have a sprawling estate or a small urban patio, cannas are surprisingly easy to integrate into your landscape.
At Longfield Gardens, we enjoy helping gardeners transform their outdoor spaces with high-impact plants that don't require professional expertise to maintain. Cannas are a perfect example of a plant that gives back far more than it asks for in terms of effort. This guide is designed for any gardener who wants to master the art of growing these tropical treasures. We will cover everything from choosing the right spot to ensuring your plants return year after year.
By focusing on a few simple needs—primarily sun, water, and warmth—you can achieve professional-looking results in a single season. Growing cannas is one of the fastest ways to add vertical drama and long-lasting color to your garden. For help matching plants to your climate, start with the Hardiness Zone Map.
Choosing the Right Cannas for Your Space
Before you get your hands in the dirt, it is helpful to understand the variety of cannas available. While all cannas share a similar tropical silhouette, they come in a wide range of heights and colors. Choosing the right variety ensures that the plant complements your garden rather than overwhelming it.
Height and Scale
Cannas are generally grouped into three size categories: dwarf, medium, and tall. Dwarf varieties typically reach about 1.5 to 2 feet in height, making them perfect for the front of a border or for smaller containers. Medium varieties grow to about 3 or 4 feet, providing an excellent mid-ground layer. Tall varieties are the true "horticultural titans," often reaching 6 to 8 feet or more. These are ideal for creating living privacy screens or dramatic backdrops along a fence or foundation.
Foliage Variations
One of the most exciting aspects of cannas is that they are just as prized for their leaves as they are for their flowers. You can choose from classic deep green foliage, blue-green shades, or striking bronze and burgundy tones. Some varieties feature variegated leaves with stripes of yellow, white, or pink. Even when the plant is not in bloom, these leaves provide a massive amount of visual interest. A standout choice is Canna Tall Tropicanna.
Flower Colors and Shapes
Canna flowers are bright, showy, and attractive to pollinators like hummingbirds. You will find blooms in shades of fiery red, electric orange, sunny yellow, and soft pink. Some flowers are solid colors, while others are speckled or have contrasting edges. The flowers generally fall into two categories based on their shape: orchid-flowering (with large, floppy petals) and gladiolus-flowering (with more structured, upright petals).
Key Takeaway: Match the mature height of your canna variety to its location in the garden. Use tall varieties for backdrops and dwarf varieties for pots and borders to ensure every plant has room to shine.
When to Plant Cannas
Timing is the most important factor when it's time to start your cannas. Because these are tropical plants, they have no tolerance for frost and are very sensitive to cold soil. If you plant them too early, the rhizomes (the thick, underground stems) may sit dormant or rot in cold, wet earth.
The Soil Temperature Rule
The best time to plant canna rhizomes directly into the garden is when the soil temperature has reached a consistent 60°F. For most gardeners, this aligns with the time you would typically plant tomatoes or peppers. A simple way to check this is to use a soil thermometer or wait until all danger of spring frost has passed and the days are reliably warm.
Starting Early Indoors
If you live in a region with a short growing season, you can give your cannas a head start. About four to six weeks before the last expected frost, plant the rhizomes in pots indoors or in a greenhouse. Use a high-quality potting mix and keep the containers in a warm, bright spot. By the time the weather is warm enough to move them outside, you will have established plants ready to take off.
Shipping and Arrival
When you order from us, we coordinate our shipping schedule with your specific USDA hardiness zone. This ensures your rhizomes arrive at the appropriate time for planting in your area. If your shipment arrives and it is still too cold to plant outside, keep the rhizomes in a cool, dry place until the soil warms up. For details on timing and delivery, see our Shipping Information.
Finding the Best Location
Cannas are not shy; they want to be the center of attention, and their physical requirements reflect that. To get the most "wow factor" from your plants, you need to match them with the right environment.
Sunlight Requirements
Cannas are sun worshippers. For the best growth and the most vibrant flower production, they need full sun. This means at least six to eight hours of direct sunlight each day. While they can survive in partial shade, they will likely become "leggy" (tall and thin) as they stretch for the light, and they will produce significantly fewer flowers. If you are growing a variety specifically for its colorful foliage, full sun is necessary to bring out those intense pigments.
Soil and Drainage
These plants are unique because they love moisture but still require decent drainage. They thrive in rich, fertile soil that is high in organic matter. If your soil is heavy clay or very sandy, you can improve it by digging in a few inches of compost or well-rotted manure before planting. This helps the soil hold onto the moisture cannas crave while allowing excess water to move away from the rhizomes.
Wind Protection
Because cannas have such large, broad leaves, they can act like sails in a high wind. In very exposed areas, the leaves can become shredded or "ratty" looking after a storm. If possible, plant your taller 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 lush and pristine all summer long.
What to do next:
- Observe your garden for a full day to identify the sunniest spots.
- Check the soil drainage by watching where water puddles after a rain.
- Amend the planting area with compost to boost fertility and texture.
How to Plant Canna Rhizomes Step-by-Step
Once the weather is warm and you have picked your spot, planting is a simple process. Canna rhizomes look like thick, bumpy ginger roots. These bumps are called "eyes," and they are the points where new growth will emerge.
Preparing the Bed
Loosen the soil to a depth of about 12 inches. This allows the roots to spread easily and helps the plant establish itself quickly. Mix in a bit of slow-release fertilizer or compost at this stage to give the rhizomes a steady food source as they start to grow.
Depth and Spacing
Dig a hole about 4 inches deep. Lay the rhizome in the hole horizontally. While it is best to point the "eyes" upward, don't worry if you can't tell which way is up; the plant is smart enough to find the light and will grow toward the surface regardless.
Spacing depends on the variety:
- Tall varieties: Space them 2 feet apart.
- Medium and Dwarf varieties: Space them 12 to 18 inches apart.
- Containers: One rhizome per 12-to-15-inch pot is usually plenty.
Initial Watering
After covering the rhizomes with soil, water the area well to settle the earth around the plant. After this initial soak, be patient. Cannas can be slow to sprout, sometimes taking three weeks or more to show their first green tips. Resist the urge to overwater during this dormant period, as the rhizome doesn't have a root system yet to drink up the moisture. If you are shopping for more warm-season plants, Longfield Gardens groups them in its Spring-Planted Summer-Blooming Bulbs collection.
Essential Care for Vibrant Blooms
Once your cannas have sprouted and are actively growing, they become very hungry and thirsty plants. Providing consistent care during the peak of summer will keep them looking spectacular until the first frost.
Watering for Success
Cannas are often described as having "wet feet." They are one of the few garden plants that can actually handle boggy conditions. During the heat of summer, they need a lot of water. If the soil dries out completely, the edges of the leaves may turn brown and crispy. Aim to keep the soil consistently moist. If you are in a period of extreme heat or drought, you may need to water your cannas every other day.
Feeding Your Plants
Because cannas grow so much biomass in a single season, they are "heavy feeders." They require a lot of nutrients to produce those massive leaves and stalks of flowers. We recommend applying a balanced, slow-release fertilizer at planting time and then supplementing with a water-soluble fertilizer every few weeks throughout the growing season. This ensures the plant never runs out of fuel.
Deadheading and Pruning
To keep the flowers coming, you should practice "deadheading." This simply means removing the spent flowers before they have a chance to form seed pods. Canna stalks usually produce a series of flower clusters. Snip off the individual faded flowers as they wither. Once an entire stalk has finished blooming, you can cut that stalk back to the next leaf or even down to the ground. This encourages the plant to send up new, fresh flowering stems.
Key Takeaway: Consistency is the secret to canna care. Regular water and regular feeding will transform a small rhizome into a tropical masterpiece in just a few months.
Managing Cannas in Containers
If you don't have a large garden bed, or if you want to decorate a patio or poolside, cannas are excellent container plants. They provide instant height and architectural interest to a group of pots.
Choosing the Container
Cannas need a large home. A pot that is at least 15 to 18 inches in diameter is a good starting point for a single rhizome. Ensure the pot has adequate drainage holes at the bottom. Because cannas grow quite tall, choose a heavy pot (like ceramic or stone) or place a few heavy rocks at the bottom of a plastic pot to prevent it from tipping over in the wind.
Potting Mix and Placement
Use a high-quality, well-draining potting mix. Container-grown plants dry out much faster than those in the ground, so you will need to be even more vigilant with watering. In the height of summer, a potted canna may need water every single day.
Creative Combinations
Cannas make a perfect "thriller" in the classic "thriller, filler, spiller" container design. Place a tall canna in the center, surround it with "fillers" like lantana or coleus, and add "spillers" like sweet potato vine or trailing petunias around the edges. The contrast between the broad canna leaves and the smaller flowers of the companion plants creates a professional, layered look.
What to do next:
- Select a heavy-bottomed pot to prevent tipping.
- Use a potting mix that retains some moisture but allows for drainage.
- Plan to water daily during the hottest weeks of July and August.
Overwintering and Storage
In warmer climates (USDA zones 8 through 11), cannas can stay in the ground all year. In zone 7, they can often survive with a thick layer of mulch for protection. However, in zone 6 and colder, the rhizomes will freeze and die if left outside. Fortunately, "lifting" cannas is a straightforward process.
Lifting the Rhizomes
Wait until the first frost has blackened the foliage. This signal tells the plant to go dormant. Cut the stalks down to about 4 inches above the ground. Use a garden fork or shovel to gently lift the entire clump of rhizomes out of the soil. Be careful not to bruise or cut the rhizomes, as damage can lead to rot during storage.
Curing and Storing
Shake off the excess soil and 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. Once dry, place the rhizomes in a box or bin filled with slightly damp peat moss, vermiculite, or even shredded newspaper.
Store the container in a cool, dark place that stays between 40°F and 50°F. A basement or an attached garage that doesn't freeze is usually ideal. Check on them once or twice during the winter; if the rhizomes look shriveled, lightly mist the packing material with water. If any look soft or rotten, discard them immediately to protect the rest of the batch.
Encouraging More Blooms
If your cannas are growing plenty of leaves but aren't producing many flowers, it is usually a sign that one of their basic needs isn't being met. Before looking for complicated fixes, check the "big three": sun, water, and food.
Light and Heat
If a canna isn't blooming, it is often because it isn't getting enough direct sunlight. Even moving a pot a few feet to avoid the shadow of a nearby tree can make a difference. Heat is also a factor; cannas really start to perform when the daytime temperatures are consistently in the 80s. If you have a cool summer, the blooming might be delayed.
The Role of Fertilizer
As mentioned, cannas are hungry. If the soil is poor, the plant will prioritize leaf growth over flower production. A fertilizer higher in phosphorus (the middle number on the fertilizer bag) can help stimulate more blooms.
Dividing Overcrowded Clumps
After a few years, a single canna rhizome can grow into a massive, crowded clump. When they are too crowded, they compete with each other for nutrients and space, which can reduce flowering. Every two or three years, it is a good idea to dig up the clump in the spring and break it into smaller sections, each with at least one or two "eyes," and replant them with fresh space.
Designing with Cannas
Cannas are versatile design tools. Their bold texture makes them stand out, but they also play well with many other garden favorites. At Longfield Gardens, we like to see cannas used to solve common landscape problems.
Creating Privacy
If you have a seating area that feels a bit too exposed, a row of tall cannas can create a lush, living screen in just a few months. Because they grow so fast, they provide privacy much quicker than most shrubs or hedges. By the time mid-summer hits, you'll have a wall of green and gold protecting your space.
Garden Companions
Cannas look best when paired with plants that have different leaf shapes. The fine, feathery texture of ornamental grasses provides a beautiful contrast to the broad, flat leaves of the canna. Other sun-loving tropicals like elephant ears (Colocasia) or hibiscus are natural partners. For a more traditional look, try planting zinnias or salvias at the base of your cannas to hide the lower stems and add an extra layer of color.
Water Features
Since cannas love moisture, they are the perfect choice for the edge of a pond or a damp spot in the yard where other plants might struggle with "wet feet." Some gardeners even grow certain varieties of cannas directly in water features by placing the pots on submerged ledges.
"Cannas are the ultimate garden chameleons. They can act as a towering privacy screen, a focal point in a decorative pot, or a lush backdrop for a colorful perennial border."
Conclusion
Growing cannas is one of the most satisfying ways to bring a touch of the tropics to your home. With their rapid growth, stunning foliage, and vibrant flowers, they provide a level of drama that few other plants can match. By ensuring they have plenty of sun, consistent moisture, and a little bit of food, you can enjoy a spectacular display from mid-summer right up until the first frost.
At Longfield Gardens, we believe that gardening should be an enjoyable and rewarding journey. Cannas are a perfect partner in that journey because they are resilient, easy to manage, and incredibly generous with their beauty. Whether you are planting them in a formal bed or a simple patio pot, these tropical stars are sure to become a highlight of your summer season. If you need help choosing plants or tracking down your order, Contact Us.
- Plant in warm soil: Wait for 60°F or higher to ensure the rhizomes sprout quickly.
- Prioritize sun: Give them at least six hours of direct light for the best blooms.
- Keep them hydrated: Maintain consistent moisture, especially during heat waves.
- Feed regularly: Use a balanced fertilizer to support their rapid growth.
Ready to start your own tropical oasis? Pick out a few of your favorite colors and get ready to watch your garden reach new heights this summer.
FAQ
Do cannas need full sun?
Yes, cannas perform best when they receive at least six to eight hours of direct sunlight each day. While they can grow in partial shade, they will produce fewer flowers and may become tall and floppy as they search for light. Full sun also helps bring out the most vibrant colors in varieties with variegated or bronze foliage.
How often should I water cannas?
Cannas love moisture and should be watered whenever the top inch of soil feels dry. In the heat of summer, this often means watering two to three times a week for plants in the ground, and potentially every day for plants in containers. They are very thirsty plants and will show their distress with browning leaf edges if left dry for too long.
Can I grow cannas in pots?
Cannas are excellent for container gardening and can thrive in pots as long as they are large enough. Use a container that is at least 15 to 18 inches wide with good drainage holes. Because they grow tall and can become top-heavy, choosing a sturdy, heavy pot will help prevent it from blowing over in the wind.
Do I need to dig up cannas in the winter?
This depends on your location. In USDA zones 8 through 11, cannas can stay in the ground year-round. In zone 7, they can often survive if protected by a thick layer of mulch. However, in zone 6 and colder, the rhizomes must be dug up after the first frost and stored in a frost-free area like a basement or garage to be replanted the following spring. For general growing and site-planning help, the Learn hub is a good place to start.