Introduction
There is something undeniably exciting about the first time a canna lily unfurls its massive, paddle-shaped leaves in the garden. These plants bring an immediate sense of the tropics to any landscape, regardless of where you live. At Longfield Gardens, we love how cannas transform a standard backyard into a lush, exotic retreat with very little effort. Their vibrant flowers and architectural foliage make them one of the most versatile "thriller" plants for both garden beds and large containers.
Finding the perfect neighbors for your cannas is the secret to a professional-looking garden. Because cannas are so bold and energetic, they pair beautifully with plants that either echo their tropical vibe or provide a soft, contrasting texture. This guide is for any gardener who wants to move beyond planting cannas in isolation and start creating stunning, multi-layered displays. We will cover the best flowers, foliage plants, and ornamental grasses to pair with your cannas for a season full of color.
Choosing the right companions enhances the bold texture and vibrant color of cannas while filling in the lower layers of the garden for a lush, finished look.
Understanding the Canna Aesthetic
Before choosing companion plants, it helps to look at what makes cannas unique. They are vertical powerhouses, often reaching heights of three to eight feet. Their leaves can be solid green, deep bronze, or spectacularly variegated with stripes of yellow, orange, and white. The flowers are equally dramatic, resembling orchids or ginger blossoms in fiery shades of red, orange, and yellow, as well as softer pinks and creams.
When we think about what grows well with cannas, we look for plants that share their love for heat and sun. Cannas are tropical natives, meaning they do their best work when the thermometer rises. They are also heavy drinkers and enjoy rich soil. By pairing them with plants that have similar needs, you ensure that the entire garden bed thrives together without anyone competing for resources.
Best Tropical Companions for a Lush Look
If you want to lean into the exotic look of cannas, the best companions are other "big-leaf" tropicals. This creates a jungle-like atmosphere that feels cohesive and high-impact.
Elephant Ears (Colocasia and Alocasia)
Elephant ears are the ultimate partner for cannas. While cannas provide height and vertical structure, elephant ears offer massive, heart-shaped leaves that can reach several feet across. The contrast in leaf shape—long and narrow for the canna versus wide and rounded for the elephant ear—is visually stunning. For a sophisticated look, try pairing a bronze-leaved canna like 'Australia' with a lime-green elephant ear. The dark and light contrast makes both colors pop.
Caladiums
Caladiums are famous for their painterly leaves in shades of white, pink, and red. While many caladiums prefer shade, there are many sun-tolerant varieties that thrive in the same sunny spots as cannas. We often suggest planting caladiums at the base of taller cannas. They act as a beautiful "filler" that hides the lower stalks of the cannas while adding intricate patterns to the ground level. A white-leaved caladium like 'White Christmas' looks particularly elegant underneath the vibrant orange flowers of a 'Tropicana' canna.
Hibiscus
For flowers that can match the scale of canna blooms, look no further than hibiscus. Both the hardy and tropical varieties offer large, plate-sized flowers that scream summer. Since both plants love the sun and consistent moisture, they are easy to care for in the same bed. Planting a red hibiscus near a yellow-flowered canna creates a warm, sunset-inspired color palette that lasts all through the hottest months.
Key Takeaway: To create a tropical paradise, pair cannas with other large-foliage plants like elephant ears or caladiums. This layering of textures makes the garden feel lush and intentional.
Flowering Companions for Summer Color
While the foliage of a canna is a major draw, the flowers are the main event in mid-to-late summer. Choosing companions that bloom at the same time—or provide a contrasting flower shape—can make your garden bed feel like a work of art.
Dahlias
Dahlias and cannas are a match made in gardening heaven. Both grow from tubers or rhizomes, both love the sun, and both hit their peak in late summer. Dahlias come in an incredible array of forms, from tiny pompons to massive dinnerplate varieties. Pairing the architectural spikes of canna flowers with the intricate, geometric petals of dahlias creates a wonderful contrast. We find that planting medium-height dahlias in front of tall cannas provides a seamless wall of color from the ground up to six feet high.
Zinnias
If you want an easy win, zinnias are the answer. These annuals are heat-tolerant and come in almost every color imaginable. They are excellent for filling in the gaps around the "feet" of your cannas. Because zinnias are so prolific, they provide constant color even if the canna takes a short break between bloom cycles. They also attract butterflies, which, when combined with the hummingbirds that love cannas, makes your garden a very busy place for pollinators.
Lantana
Lantana is a rugged, sun-loving plant that produces clusters of small, multi-colored flowers. It has a mounding or trailing habit, making it a great choice for the front of a border featuring cannas. The small, delicate textures of lantana flowers and leaves provide a perfect counterpoint to the massive scale of the canna. Plus, lantana is incredibly drought-tolerant once established, which provides a bit of a safety net for the garden bed.
Salvia
The vertical spikes of salvia—especially in deep blues and purples—provide a beautiful color contrast to the predominantly warm tones of cannas. Blue salvia paired with a yellow or orange canna like 'Pretoria' creates a classic complementary color scheme. The airy, thin spikes of the salvia also help break up the heavy look of the large canna leaves, adding a sense of movement to the garden.
Foliage Friends for Texture and Contrast
Sometimes the best companion for a bold plant is another foliage plant that brings a different texture or color to the table. This keeps the garden interesting even when nothing is in bloom.
Coleus
Coleus is a versatile foliage plant that comes in hundreds of colors and patterns. Like caladiums, many modern coleus varieties are bred to handle full sun. You can find coleus with lime green, deep burgundy, bright pink, or multi-colored leaves. We recommend choosing a coleus variety that picks up one of the colors in your canna's leaves. For example, if you are growing a 'Tropicana' canna with orange and yellow stripes, a coleus with a splash of orange in the center of the leaf will tie the whole look together.
Sweet Potato Vine (Ipomoea batatas)
Sweet potato vine is the king of the "spiller" plants. Whether in a pot or a garden bed, it grows rapidly and trails across the ground. The lime-green or dark purple foliage creates a carpet of color that offsets the vertical growth of the canna. If you have a dark-leaved canna like 'Red Futurity', a lime-green sweet potato vine provides a brilliant, neon-like contrast at the base.
Amaranth
For a more dramatic, taller companion, amaranth is an excellent choice. Varieties like 'Love Lies Bleeding' produce long, tassel-like red flowers that hang down, providing a unique vertical contrast to the upright flowers of the canna. The foliage of amaranth is often a rich burgundy, which complements bronze-leaved cannas beautifully. This combination is particularly effective for creating a temporary hedge or a privacy screen during the summer months.
Ornamental Grasses for Movement
Cannas are very static and bold, so adding ornamental grasses can introduce much-needed movement and a softer texture. Grasses sway in the breeze and catch the light in a way that large-leaved plants cannot.
Purple Fountain Grass (Pennisetum setaceum 'Rubrum')
This is perhaps the most popular grass to pair with cannas. Its burgundy-purple foliage and soft, feathery plumes look stunning alongside almost any canna variety. The arching shape of the grass softens the stiff, upright lines of the canna stalks. Because purple fountain grass loves heat and sun just as much as cannas do, they grow at a similar rate and look great all the way into autumn.
Miscanthus
Taller grasses like Miscanthus (Maiden Grass) can be planted behind cannas to create a textured backdrop. The fine, silvery-green blades of the grass provide a neutral background that makes the vibrant colors of the canna flowers stand out. In the late season, the seed heads of the grass add an extra layer of interest that persists even after the first frost.
Key Takeaway: Balance the "heaviness" of cannas by incorporating airy ornamental grasses or trailing vines. This adds movement and prevents the garden from looking too stiff.
Designing Containers: The Thriller, Filler, Spiller Method
Cannas are some of the best plants for large containers because they provide immediate "thrill." However, a canna in a pot by itself can look a little lonely. Using the "thriller, filler, spiller" method is an easy way to create a professional-looking arrangement.
- The Thriller (Canna): Plant one or two cannas in the center or back of a large pot. Choose a variety that fits the scale of your container—standard cannas for very large pots, or dwarf varieties for medium-sized ones.
- The Filler (Mid-height plants): Surround the canna with plants like begonias, coleus, or lantana. These plants fill the middle space of the pot and hide the base of the canna.
- The Spiller (Trailing plants): Add plants like sweet potato vine, ivy, or bacopa around the edges of the pot. These will trail over the sides, softening the edges of the container and making the whole arrangement look more abundant.
When planting in containers, remember that cannas are hungry and thirsty. We suggest using a pot with a minimum diameter of 15 to 20 inches to ensure there is enough soil to hold moisture and provide room for the roots to grow. A large pot also stays upright more easily when the cannas reach their full height and catch the wind. For additional guidance, see these canna container planting tips.
What to Do Next: Companion Planting Steps
- Select your canna variety first: Decide if you want green, bronze, or variegated foliage.
- Match by sun and water: Ensure all chosen companions love 6–8 hours of direct sun.
- Layer by height: Place cannas in the back (or center of a pot) and shorter plants in front.
- Choose a color theme: Go for "tropical hot" (reds/oranges) or "cool contrast" (purples/blues).
- Give them room: Space plants according to their mature width so they don't get smothered by the fast-growing cannas.
Creating Seasonal Interest with Cannas
One of the best things about cannas is how they bridge the gap between summer and fall. While many spring-blooming perennials start to fade in the July heat, cannas are just getting started. To extend the beauty of your garden, pair them with late-season stars.
Plants like Rudbeckia (Black-eyed Susans) and Russian Sage are fantastic companions for the later half of the summer. The golden yellow of the Rudbeckia echoes the warm tones of many canna varieties, while the airy, lavender-blue of the Russian Sage provides a cool contrast. These plants are tough and can handle the same intense sun that cannas crave.
As autumn approaches, the foliage of the canna often becomes even more vibrant. If you have a variety with bronze or variegated leaves, it will look right at home next to fall-blooming chrysanthemums or ornamental kales. Even as the flowers begin to slow down, the structure of the canna remains a focal point in the garden until the first frost.
Maintenance Tips for Canna Combinations
When you plant multiple species together, a little extra care goes a long way. Because cannas grow so quickly—sometimes up to an inch a day in mid-summer—they can occasionally overshadow their smaller neighbors.
Don't be afraid to prune back trailing plants or "filler" plants if they start to get too unruly. Similarly, if a canna leaf is blocking too much sun from a smaller plant underneath, you can cleanly snip that leaf off at the base of the stem. Regular deadheading (removing spent flowers) will also keep both the cannas and their flowering companions looking tidy and encourage more blooms.
Watering is the most important part of keeping these combinations happy. A garden bed filled with cannas and lush companions will lose moisture quickly through all those large leaves. We recommend watering deeply at the base of the plants rather than overhead. This ensures the water reaches the roots and keeps the foliage dry, which helps prevent any fungal issues.
Key Takeaway: Successful companion planting is about shared needs. Keep the soil rich and the water flowing, and your cannas will happily share the stage with their neighbors.
Conclusion
Growing cannas is a rewarding way to add drama and scale to your home garden. By pairing them with the right companions—like elephant ears for a tropical look, dahlias for floral impact, or sweet potato vines for a lush groundcover—you can create a multi-dimensional landscape that looks like it was designed by a pro. At Longfield Gardens, we believe that gardening should be an enjoyable, creative process. Experimenting with different color and texture combinations is part of the fun!
- Focus on Foliage: Use plants like coleus and caladiums to complement the bold leaves of the canna.
- Mix Your Textures: Contrast the solid, large leaves of the canna with airy grasses or delicate flowers like salvia.
- Plan for Height: Always place your tall cannas where they won't block the sun for shorter companions.
Whether you are planting a massive border or a single beautiful container, cannas are ready to be the star of the show. Start with the plants you love most, give them plenty of sun and water, and enjoy the tropical oasis you've created.
FAQ
What are the best low-growing plants to put in front of cannas?
Sweet potato vine, lantana, and zinnias are excellent choices for the front of a canna bed. They provide a "skirt" of color and texture that hides the base of the canna stalks while filling in the lower layer of the garden.
Do cannas need a lot of water when planted with other flowers?
Yes, cannas are very thirsty plants and prefer consistently moist soil. When planting them with companions, choose other plants that also enjoy regular watering, such as hibiscus, dahlias, or elephant ears, to ensure everyone stays healthy.
Can I grow cannas with plants that like shade?
Most cannas require full sun (6–8 hours) to bloom well and maintain vibrant foliage colors. However, you can pair them with "transitional" plants like certain coleus or caladium varieties that are bred to handle both sun and part-shade.
How much space should I leave between cannas and their companion plants?
It is best to leave about 1 to 2 feet of space between a canna rhizome and its neighbors. Cannas grow quickly and spread outward, so giving them a little breathing room prevents them from crowding out smaller, slower-growing plants. For more detail, read this guide to spacing canna bulbs.
