Table of Contents
- Introduction
- Why Choose Containers for Canna Lilies
- Choosing the Right Container
- The Best Soil and Fertilizer
- Selecting Canna Varieties for Pots
- How to Plant Canna Rhizomes in Containers
- Light and Temperature Requirements
- Watering Your Potted Cannas
- Design Tips: The "Thriller, Filler, and Spiller" Method
- Routine Maintenance and Deadheading
- End-of-Season Care and Overwintering
- Conclusion
- FAQ
- Choosing the Right Location
Introduction
There is nothing quite like the sight of a bold, tropical canna lily blooming on a sunny patio to make your outdoor space feel like a private resort. These plants are beloved for their oversized, paddle-shaped leaves and vibrant flowers that stand up to the heat of midsummer when other plants might begin to fade. Whether you have a sprawling backyard or a small apartment balcony, growing canna lilies in containers is one of the easiest ways to bring high-impact color and architectural height to your home.
At Longfield Gardens, we enjoy helping gardeners find the best ways to use flower bulbs and rhizomes to create a beautiful landscape. Cannas are particularly well-suited for life in pots because they are vigorous growers that appreciate the warmth and controlled environment a container provides. Growing them this way also makes it much simpler to move them around for the best sun exposure or to store them away once the growing season ends.
This guide will walk you through everything you need to know about successfully growing canna lilies in containers. We will cover how to choose the right pot, the best soil for healthy growth, and the simple maintenance steps that keep your plants looking lush and vibrant. If you need help with planting depth, see our How Deep to Plant Canna Lily Bulbs for Best Results guide.
Why Choose Containers for Canna Lilies
Growing canna lilies in containers offers several advantages that make gardening more flexible and enjoyable. For many, the primary benefit is portability. Since cannas love the sun, being able to move a pot to the brightest spot on your deck ensures the plant gets the energy it needs to produce those signature showy blooms. If you are hosting a summer gathering, you can easily shift your pots to create a colorful backdrop for your guests.
Containers also provide an easy solution for gardeners in cooler climates. Cannas are tropical plants that are only winter-hardy in USDA zones 7 and warmer. In colder regions, the rhizomes must be lifted and stored indoors for the winter. When they are already in pots, the process of moving them to a frost-free garage or basement becomes much less of a chore. You can simply cut back the foliage and move the entire container, or easily tip the pot to harvest the rhizomes for storage.
Finally, containers help you manage the vigorous growth of cannas. These plants spread via underground rhizomes, and in the ground, they can quickly fill a space. A pot acts as a natural boundary, keeping the plant tidy and focused on vertical growth. This makes them excellent "thriller" plants in a container design, where their height and bold foliage provide a stunning centerpiece for smaller "filler" and "spiller" plants.
Choosing the Right Container
Success with canna lilies begins with the right pot. Because cannas grow quickly and produce a large amount of foliage, they need a sturdy home that can support their weight and provide enough room for their roots.
Size Matters
Cannas have substantial root systems and heavy rhizomes. For a single standard-sized canna lily, you should look for a container that is at least 15 to 18 inches in diameter. If you are planting one of the larger varieties that can reach five or six feet in height, a 20-inch pot or even a half-barrel is a better choice. Larger pots hold more soil, which stays moist longer and provides the weight necessary to keep the tall plants from tipping over during a summer breeze.
Material and Stability
The material of the pot is largely a matter of personal style, but there are some practical considerations. Ceramic and clay pots are heavy and stable, which is excellent for tall cannas. However, they can be difficult to move. High-quality plastic or resin containers are much lighter and often a do better job of retaining moisture, which cannas love. If you choose a lighter pot, you can add a layer of heavy stones or gravel at the bottom to provide extra stability against the wind.
Drainage is Essential
While cannas enjoy plenty of water, they do not like to sit in stagnant, soggy soil. Ensure your chosen container has at least one large drainage hole in the bottom. If you find a decorative pot you love that lacks drainage, you can use it as a "cachepot." This means planting the canna in a plain plastic nursery pot with holes and then placing that pot inside the decorative one.
Key Takeaway: Choose a large, heavy-bottomed container with good drainage to accommodate the canna's height and thirsty root system.
The Best Soil and Fertilizer
Cannas are "heavy feeders," meaning they require plenty of nutrients to produce their large leaves and frequent flowers. Because they are confined to a pot, they rely entirely on the soil and fertilizer you provide.
Using High-Quality Potting Mix
Never use ordinary garden soil in your containers. Garden soil is too heavy and will compact over time, choking out the roots and preventing proper drainage. Instead, use a high-quality, peat-based potting mix. These mixes are designed to be light and fluffy, allowing air to reach the roots while still holding onto the moisture the plant needs. Many premium potting mixes also contain a small amount of slow-release fertilizer to get your plants off to a great start.
Nutrient Requirements
To keep your cannas blooming throughout the summer, regular feeding is important. We recommend applying a balanced, water-soluble fertilizer every two to three weeks. A fertilizer with an N-P-K ratio like 10-10-10 or 5-10-5 works well. The nitrogen supports the lush green or bronze foliage, while the phosphorus encourages the development of flower spikes. Always follow the instructions on the fertilizer label to ensure you are providing the correct amount.
Selecting Canna Varieties for Pots
When you browse the selection at Longfield Gardens, you will notice that canna lilies come in a wide range of heights and colors. Choosing the right variety for your container depends on how much space you have and the visual look you want to achieve. You can also explore our Tall Cannas collection for dramatic container-height choices.
Dwarf vs. Tall Varieties
Dwarf cannas are a fantastic choice for smaller pots or for gardeners who want the tropical look without the massive height. These varieties usually top out at around two to three feet. They are very sturdy and less likely to be affected by wind.
Standard or tall cannas can reach four to six feet or more. These make a dramatic statement at the back of a patio or used as a privacy screen. Because of their height, they require the largest containers and may need a bit of protection from heavy winds to prevent the leaves from tearing.
Foliage and Flower Colors
The foliage of a canna is often just as beautiful as the flowers. You can choose from classic bright green, deep burgundy, or even variegated patterns with stripes of yellow, white, and orange.
- Green foliage: Provides a fresh, lush backdrop for bright red or yellow flowers.
- Bronze or Burgundy foliage: Adds a moody, sophisticated touch and contrasts beautifully with orange or pink blooms.
- Variegated foliage: Varieties like Pretoria or Stuttgart offer stunning striped leaves that act as a focal point even when the plant isn't in bloom.
How to Plant Canna Rhizomes in Containers
Planting cannas is a straightforward process. If you are starting with bare rhizomes, you can begin them indoors in early spring or wait until the weather has warmed up to plant them directly outside.
Timing Your Planting
Cannas are heat-loving plants and will not grow if the soil is cold. The best time to move your pots outdoors is after all danger of frost has passed and the soil temperatures are consistently above 60°F. If you want to get a head start, you can plant your rhizomes in pots indoors about four to six weeks before the last expected frost date. Keep them in a warm, sunny window, and they will be ready to take off as soon as they go outside.
Planting Depth and Direction
When you look at a canna rhizome, you will see small, pointed bumps. These are called "eyes," and they are where the new stems will grow.
- Fill your container with potting mix until it is about five or six inches from the top.
- Lay the rhizome horizontally on the soil.
- Ensure the "eyes" are pointing upward. If you can't tell which way is up, don't worry—the plant will eventually find its way toward the light.
- Cover the rhizome with four inches of soil.
- Water the pot thoroughly to settle the soil around the rhizome.
Spacing
In a 15-inch pot, one rhizome is usually plenty. Cannas grow quickly and will fill the space in just a few months. If you are using a very large container, such as a half-barrel, you can plant two or three rhizomes, spacing them about 6 to 10 inches apart.
What to Do Next:
- Check the "eyes" on your rhizomes before planting.
- Position the rhizome horizontally.
- Cover with exactly four inches of soil.
- Keep the soil warm to encourage the first sprouts.
Light and Temperature Requirements
To see your cannas at their best, you must satisfy their craving for sunlight and warmth. These are not plants for the deep shade; they need the energy from the sun to fuel their rapid growth and flower production.
Full Sun is Best
For the most vibrant flowers and strongest stems, place your containers in a spot that receives at least six to eight hours of direct sunlight each day. While cannas can grow in partial shade, they will likely produce more leaves and fewer flowers, and the stems may become "leggy" as they reach toward the light. If you are growing a variety with dark burgundy or variegated leaves, full sun will help those colors stay intense and saturated.
Managing the Heat
Cannas thrive in the heat and humidity of summer. In fact, the hotter it gets, the faster they seem to grow. Unlike many other garden plants that might wilt or go dormant in a mid-August heatwave, cannas will continue to push out new growth as long as they have enough water. If you live in an exceptionally hot desert climate, your potted cannas might appreciate a little bit of dappled shade during the hottest part of the afternoon to prevent the leaf edges from scorching.
Watering Your Potted Cannas
Watering is the most important part of daily care for canna lilies in containers. Because they have such large leaves, they lose moisture through evaporation very quickly.
Keeping Soil Moist
Unlike many bulbs that prefer to dry out between waterings, cannas like their soil to be consistently moist. During the peak of summer, you will likely need to water your containers every single day. If the weather is particularly windy or hot, you may even need to water them twice—once in the morning and once in the evening.
The Finger Test
To determine if your canna needs water, use the "finger test." Stick your finger about an inch into the soil. If the soil feels dry at that depth, it is time to water. When you water, do so thoroughly until you see water running out of the drainage holes at the bottom of the pot. This ensures that the moisture is reaching the roots at the very bottom of the container and helps wash away any accumulated salts from fertilizers.
Signs of Underwatering
If your canna lily isn't getting enough water, the leaves will give you a clear sign. You may see the edges of the leaves turning brown and crispy, or the leaves might begin to roll inward. While the plant is resilient and will usually bounce back once watered, consistent underwatering will stress the plant and reduce the number of flowers it produces.
Design Tips: The "Thriller, Filler, and Spiller" Method
Because canna lilies are so tall and dramatic, they are the perfect candidate for the "thriller" in a mixed container design. Using this three-part method helps you create a professional-looking arrangement that looks full and balanced. For a ready-made planting option, the Canna Assorted Collection is a simple way to mix height and color.
The Thriller
The canna lily is your thriller. Its height and bold foliage draw the eye upward and provide the architectural backbone of the pot. Place the canna in the center of the container if it will be viewed from all sides, or toward the back if the pot will be placed against a wall.
The Filler
Fillers are mounding plants that surround the base of the canna. They hide the "legs" of the taller plant and make the container look lush. Good choices for fillers include:
- Lantana: These love the same heat and sun as cannas and come in vibrant colors.
- Begonias: Their waxy leaves and constant blooms complement the tropical look.
- Coleus: Known for their colorful foliage, they can match or contrast with the canna leaves.
The Spiller
Spillers are trailing plants that grow over the edges of the pot and "spill" toward the ground. This softens the edges of the container and adds a sense of abundance. Excellent spillers for canna pots include:
- Sweet Potato Vine: Available in lime green or dark purple, these grow very fast and look truly tropical.
- Creeping Jenny: Its bright gold leaves provide a beautiful contrast to dark-leaved cannas.
- Calibrachoa: These produce hundreds of small, petunia-like flowers all summer long.
Routine Maintenance and Deadheading
Cannas are relatively low-maintenance, but a few minutes of attention each week will keep them looking their best from June through the first frost.
Deadheading for More Blooms
Deadheading is the process of removing spent flowers. When a flower on a canna spike fades, you can pinch it off. Once the entire spike has finished blooming, look down the stem. Often, a second or third flower spike is already waiting to emerge from a lower joint. Cut the old flower stalk off just above the next side branch or leaf. This prevents the plant from putting energy into producing seeds and encourages it to keep producing new blossoms.
Grooming the Foliage
High winds or heavy rain can sometimes tear the large leaves of a canna lily, making them look a bit tattered. If a leaf becomes damaged or begins to turn yellow as it ages, simply use a clean pair of garden shears to snip it off at the base of the stem. This keeps the plant looking tidy and makes room for fresh, new leaves to emerge from the center.
Pest Monitoring
While cannas are generally hardy, they can occasionally attract "canna leaf rollers," which are small caterpillars that stitch the leaves shut before they can unfurl. If you see leaves that are stuck together or have rows of holes, you can manually unroll them to remove the pests or use a biological control like Bt (Bacillus thuringiensis), which is a naturally occurring soil bacterium that is safe for many beneficial insects but effective against caterpillars.
End-of-Season Care and Overwintering
As the summer winds down and the first frost approaches, it is time to think about the next season. In zones 7 and warmer, you can often leave your pots outside, perhaps moving them to a protected area. In colder zones, a little bit of preparation will ensure your cannas return next year. For shipping and timing questions, see our Shipping Information page.
Harvesting the Rhizomes
Once the first frost blackens the foliage, the growing season is officially over.
- Cut the stems down to about two or three inches above the soil line.
- Carefully lift the rhizomes out of the pot. You will likely notice they have grown significantly larger than when you planted them in the spring.
- Shake off the excess soil and let them dry in a shady, well-ventilated spot for a day or two.
- Store the rhizomes in a cardboard box or a breathable bag filled with peat moss or vermiculite.
- Keep them in a cool, dark place (between 45°F and 60°F) where they won't freeze.
Storing the Whole Pot
If you have the space, an even easier method is to leave the rhizomes in the pot. Simply cut back the dead foliage and move the entire container into a frost-free garage or basement. Do not water the pot during the winter; you want the rhizomes to remain dormant. In the spring, move the pot back into the sun, give it a good soak, and wait for the new sprouts to appear.
What to Do Next:
- Wait for the first frost to signal the end of the season.
- Cut back foliage to the soil line.
- Store in a cool, dry, frost-free location.
- Divide large rhizomes in the spring before replanting.
Conclusion
Growing canna lilies in containers is a rewarding way to add drama and tropical flair to your garden with very little effort. By choosing a large pot, providing plenty of sun and water, and feeding them regularly, you can enjoy a spectacular display of foliage and flowers all season long. These resilient plants are a favorite at Longfield Gardens because they offer so much beauty in return for such simple care. If you want to learn more about our company, visit our About Us page.
- Select a large container with excellent drainage.
- Use high-quality potting mix and feed every two weeks.
- Place in full sun and water daily during the heat of summer.
- Deadhead spent blooms to encourage continuous flowering.
Whether you are a seasoned gardener or just starting your first patio display, cannas are a perfect choice for high-impact results. We invite you to explore the different colors and sizes available to find the perfect match for your style.
"Cannas bring an unmatched energy to the summer garden, proving that you don't need a tropical climate to enjoy a tropical paradise in your own backyard."
FAQ
How many canna rhizomes can I plant in one pot?
For a standard 15-inch container, we recommend planting just one rhizome. Cannas grow very quickly and will produce multiple stems that will fill the pot by midsummer. If you use a very large container, like a 20-inch pot or a whiskey barrel, you can plant two or three rhizomes.
Can canna lilies grow in the shade?
While canna lilies can survive in partial shade, they will not perform their best. They need at least six hours of direct sunlight to produce their best flower displays and to keep their stems strong. In too much shade, the plants may become thin and fail to bloom.
Why are the leaves on my potted canna turning brown?
The most common cause of brown leaf edges in containers is underwatering. Cannas have a very high water requirement, especially in pots. If the soil dries out completely, the plant cannot support its large leaves, and the edges will scorch. Ensure you are watering deeply every day during hot weather.
When should I move my potted cannas outdoors in the spring?
You should wait until all danger of frost has passed and the nighttime temperatures are consistently above 50°F. Since the soil in containers warms up faster than the ground, you can often get them started a bit earlier, but be ready to move them into a garage or cover them if a late frost is predicted.
Choosing the Right Location
If you want to confirm your planting window by climate, the Hardiness Zone Map can help you line up your spring and fall timing.
Can canna lilies grow in the shade?
While canna lilies can survive in partial shade, they will not perform their best. They need at least six hours of direct sunlight to produce their best flower displays and to keep their stems strong. In too much shade, the plants may become thin and fail to bloom.