Table of Contents
- Introduction
- Understanding What Cannas Need
- Bold Foliage Companions
- Flowering Partners for Constant Color
- Texture and Movement
- Designing by Height: The Tiered Approach
- Successful Container Combinations
- Designing with Color in Mind
- Practical Tips for Growing Cannas and Companions
- Conclusion
- FAQ
Introduction
There is something undeniably exciting about the first time a canna leaf unfurls in the summer sun. These plants bring a bold, tropical energy to the garden that few other flowers can match. At Longfield Gardens, we love how cannas transform a standard backyard into a lush, vibrant getaway with very little effort. Their massive, paddle-shaped leaves and orchid-like blooms make them the undisputed stars of the summer season. (longfield-gardens.com)
While cannas are stunning on their own, they truly shine when paired with the right neighbors. Choosing the best companion plants helps to highlight their unique colors, balance their height, and fill in the spaces around their base. Whether you are planting in a large garden bed or a decorative patio pot, the right combinations create a professional, layered look. (longfield-gardens.com)
This guide will help you identify which plants thrive alongside cannas and how to arrange them for maximum impact. We will cover foliage favorites, flowering partners, and the best choices for container "recipes." By matching your cannas with plants that share their love for sun and water, you can create a high-impact display that lasts until the first frost.
Understanding What Cannas Need
Before choosing companions, it is helpful to look at what makes a canna thrive. These are "hungry" and "thirsty" plants. They love full sun, warm soil, and consistent moisture. They also grow quite quickly, often reaching several feet in height in just a single season. (longfield-gardens.com)
The best companions for cannas are plants that enjoy these same conditions. If you choose a plant that prefers dry, sandy soil or deep shade, it will likely struggle next to a vigorous canna. We recommend focusing on "right plant, right place" by selecting partners that crave at least six hours of direct sunlight and can handle frequent watering. (longfield-gardens.com)
Key Takeaway: Always pair cannas with sun-loving, moisture-tolerant plants to ensure every member of your garden bed stays healthy and vibrant. (longfield-gardens.com)
Bold Foliage Companions
One of the best ways to design with cannas is to lean into their tropical aesthetic. Since cannas have large, smooth leaves, they look fantastic when paired with other plants that have dramatic foliage. This creates a "jungle" feel that keeps the garden looking lush even when nothing is currently in bloom.
Elephant Ears (Colocasia and Alocasia)
Elephant ears are perhaps the most natural partner for cannas. Both plants share a tropical heritage and a love for damp soil. While cannas provide vertical structure and bright flowers, elephant ears offer massive, heart-shaped leaves that can grow several feet wide. Elephant Ear Assorted Collection is a good place to start if you want that oversized-leaf effect. (longfield-gardens.com)
If you are growing a dark-leaved canna like 'Australia', try pairing it with a lime-green elephant ear for a high-contrast look. If you have a variegated variety like 'Tropicanna', a deep purple or black elephant ear can help the orange and gold stripes in the canna leaves really pop. (longfield-gardens.com)
Caladiums
For the lower levels of your garden, caladiums are an excellent choice. These plants stay much shorter than cannas, making them perfect for filling in the "naked" stems at the base of tall canna varieties. Caladium Fancy Mix - Bulk Offer gives you a carpet of colorful foliage that works especially well in warm, humid conditions. (longfield-gardens.com)
While many caladiums prefer shade, we offer several sun-tolerant varieties that can stand up to the bright light cannas require. These heart-shaped leaves add a delicate texture that balances the broad, architectural look of the canna foliage. (longfield-gardens.com)
Coleus
Coleus is a versatile companion that offers nearly endless color options. Because coleus is grown for its leaves rather than its flowers, it provides consistent color from spring through fall. You can find coleus in shades of neon green, deep burgundy, hot pink, and even multi-colored patterns.
We suggest using coleus as a mid-height filler. It is easy to pinch back to keep it bushy, and it fills the gaps between taller cannas perfectly. Match the color of your coleus to the veins or edges of your canna leaves for a coordinated, designer look.
Sweet Potato Vine (Ipomoea)
If you are looking for a "spiller" to trail over the edge of a pot or act as a groundcover around your cannas, sweet potato vine is the winner. This vigorous grower comes in lime green, dark purple, and variegated bronze. It loves the heat and water just as much as cannas do. The trailing stems soften the vertical lines of the canna and create a carpet of color at its feet.
What to do next:
- Identify the foliage color of your canna (green, bronze, or variegated).
- Select one "large" foliage companion like an elephant ear.
- Choose a "small" foliage companion like coleus or sweet potato vine to fill the lower space.
Flowering Partners for Constant Color
While the foliage of a canna is a major draw, the flowers are the main event in mid-to-late summer. To keep your garden looking bright all season, pair your cannas with other sun-loving bloomers.
Dahlias
Detailed dahlia collections and cannas are a match made in heaven. They both grow from tubers or rhizomes, love the sun, and hit their peak bloom in late summer. Tall dahlia varieties can stand side-by-side with cannas, creating a wall of flowers in the back of a border. (longfield-gardens.com)
For a sophisticated look, pair dark-leaved cannas with white or pale pink dahlias. The dark background makes the flower colors appear much more saturated. Since both plants require similar care, including staking for the taller varieties, they are easy to maintain together. (longfield-gardens.com)
Zinnias
Zinnas are the hardworking heroes of the summer garden. They are incredibly easy to grow and provide a constant supply of nectar for butterflies and bees. Their cheerful, round flowers provide a nice shape contrast to the tall, orchid-like spikes of the canna.
Zinnias are also quite drought-tolerant once they get established, but they will thrive with the regular watering you give your cannas. We love how a mix of bright zinnia colors creates a "cottage garden" feel even when mixed with more tropical-looking plants.
Lantana
Lantana is a heat-loving powerhouse that blooms non-stop. Its clusters of tiny flowers often change color as they age, giving you a multicolored effect on a single plant. Lantana is excellent for attracting hummingbirds, which will also visit your canna flowers. It works well as a mounding filler around the base of cannas in large landscape beds.
Salvia
The vertical spikes of salvia (especially the deep blue and purple varieties) provide a beautiful contrast to the broad leaves of the canna. Salvia adds a sense of airy lightness to the garden. It is also a favorite for pollinators. Planting salvia in front of cannas creates a tiered effect that leads the eye from the ground up to the taller blooms.
Key Takeaway: Choose flowering companions that bloom in late summer to ensure your garden reaches its peak beauty just as the cannas are at their tallest. (longfield-gardens.com)
Texture and Movement
A great garden design is about more than just color; it is also about texture. Cannas are very "heavy" looking plants because of their thick stems and wide leaves. Adding plants with fine texture or movement helps the garden feel more balanced and natural.
Ornamental Grasses
Ornamental grasses add a soft, wispy texture that "breaks up" the solid look of canna foliage. Varieties like Purple Fountain Grass (Pennisetum) are especially popular because their burgundy blades complement bronze-leaved cannas beautifully. The feathery plumes of the grass sway in the breeze, adding movement to a garden that might otherwise feel static.
Verbena bonariensis
This plant is often called "purple top" or "tall verbena." It features long, wiry stems topped with clusters of tiny purple flowers. It is very see-through, meaning you can plant it in front of cannas without hiding them. It creates a purple haze that makes the bright oranges and reds of cannas look even more vibrant.
Marigolds
Marigolds are a classic choice for a reason. Their lacy, fern-like foliage is the perfect textural opposite of a canna leaf. Beyond their looks, marigolds are often used in companion planting to help deter certain soil pests like nematodes. They stay relatively low, making them a great edging plant for a canna bed.
Designing by Height: The Tiered Approach
One of the most common questions we get is how to arrange these plants so everything can be seen. Because cannas can grow anywhere from 2 to 8 feet tall, depending on the variety, height placement is critical.
The Back Row (The Backdrop)
Use the tallest canna varieties as a living screen or backdrop. Varieties like 'Musifolia' or Pretoria are excellent for this. In front of them, you can place mid-sized plants like dahlias or tall zinnias. This creates a wall of color that hides fences or unattractive views. (longfield-gardens.com)
The Middle Ground (The Fillers)
For cannas that reach 3 to 4 feet, use them in the middle of a border. Surround them with mid-sized companions like coleus, salvia, or fountain grass. This ensures the canna remains the "thriller" or focal point without leaving a gap at the bottom of the plant.
The Front Edge (The Finishers)
Always finish the look with low-growing plants. Sweet potato vine, marigolds, or dwarf zinnias are perfect here. They hide the soil and create a finished, polished appearance.
Planting for Privacy
If you want to use cannas as a privacy hedge, plant them in a double row, staggering the plants. You can interplant them with tall sunflowers or amaranth. This creates a dense, beautiful wall of green and color that lasts all summer long.
Key Takeaway: Layering plants by height ensures that every variety gets enough sunlight and that your garden looks full from the ground up. (longfield-gardens.com)
Successful Container Combinations
Cannas are fantastic for pots because they provide instant height. When planting in containers, we recommend the "Thriller, Filler, Spiller" method. This is a simple way to ensure your pot looks professional and balanced.
- The Thriller: This is your canna. Place it in the center or the back of the pot. It provides the height and the main focal point.
- The Filler: These are mounding plants that fill the space around the canna. Think begonias, coleus, or lantana.
- The Spiller: These are trailing plants that hang over the side of the pot. Sweet potato vine, vinca vine, or trailing petunias are perfect choices.
The "Tropical Sunset" Recipe
- Thriller: Canna 'Tropicanna' (orange, gold, and green striped leaves).
- Filler: Orange or yellow Lantana.
- Spiller: Lime-green Sweet Potato Vine. This combination glows in the afternoon sun and brings a warm, tropical vibe to any patio. (longfield-gardens.com)
The "Moody Elegance" Recipe
- Thriller: Canna 'Australia' or 'Tropicanna Black' (deep burgundy/black leaves).
- Filler: White Caladiums or 'Diamond Frost' Euphorbia.
- Spiller: Silver Falls Dichondra or dark purple Sweet Potato Vine. The contrast between the dark foliage and the bright white flowers or silver leaves is sophisticated and striking. (longfield-gardens.com)
Container Care Tips:
- Pot Size: Use a large pot (at least 15–20 inches in diameter). Cannas have large root systems and will quickly fill a small pot.
- Watering: Pots dry out faster than the ground. In the heat of summer, you may need to water your canna containers every day.
- Fertilizer: Because you are watering frequently, nutrients wash out of the soil. Use a water-soluble fertilizer every two weeks to keep the plants blooming.
Designing with Color in Mind
Cannas offer some of the most intense colors in the plant world. To make your garden look like it was designed by a pro, try these color-matching strategies.
Harmonious Colors
Choose companions that are in the same color family as your canna blooms. If you have a red-flowering canna, pair it with red salvias or deep orange zinnias. This creates a high-energy, fiery look that feels very intentional.
Contrasting Colors
For a look that really grabs attention, go for opposites on the color wheel. Pair a yellow-flowering canna with purple salvia or blue ageratum. The purple makes the yellow look even brighter, and vice versa.
Foliage Contrast
If your canna has dark, bronze leaves, use light-colored companions. Silver-foliaged plants like Dusty Miller or white flowers will pop against the dark background. If your canna is bright green, deep purple coleus or dark-leaved dahlias provide a beautiful, moody contrast.
Practical Tips for Growing Cannas and Companions
To keep your combinations looking their best, follow a few simple rules of thumb.
Space Them Properly
It is tempting to pack plants in tightly for an "instant" look, but cannas grow very fast. Give your cannas room to breathe. Usually, 12 to 18 inches between plants is a good starting point. This prevents the canna from completely shading out its smaller companions.
Match Your Water Needs
As we mentioned, cannas love water. If you plant them next to lavender or succulents, those drought-loving plants will likely rot from the frequent watering. Always double-check that your fillers and spillers are "moisture-tolerant."
Feeding Your Display
Cannas are heavy feeders. They need plenty of energy to produce those massive leaves and tall flower spikes. When you fertilize your cannas, your companion plants will benefit too. A balanced, slow-release fertilizer at planting time, followed by liquid feeding during the peak of summer, will keep everyone happy.
Deadheading
To keep the flowers coming, remove the spent blooms on both your cannas and your companions (like zinnias and dahlias). This prevents the plant from putting energy into seed production and encourages more flowers. For cannas, simply snip the individual flower stems off once they fade.
Key Takeaway: Success with companion planting comes down to matching the sun, water, and nutrient needs of all the plants in the group. (longfield-gardens.com)
Conclusion
Designing a garden with cannas is a rewarding way to bring a touch of the tropics to your home. By pairing them with the right companions, you can highlight their bold colors and create a lush, layered look that lasts all season. Whether you prefer the dramatic contrast of dark foliage or the cheerful energy of a multicolored flower bed, there is a perfect partner for every canna.
At Longfield Gardens, we take pride in providing high-quality rhizomes and perennials that help you achieve these beautiful results. Remember that gardening is an evolving process—don't be afraid to try a new combination this year! (longfield-gardens.com)
- Choose companions that share the canna's love for full sun and consistent moisture.
- Use a mix of foliage and flowers to ensure the garden looks great even between bloom cycles.
- Remember the "Thriller, Filler, Spiller" method for easy, high-impact containers.
"A well-paired garden is more than just a collection of plants; it is a living tapestry that brings joy and beauty to your outdoor space every single day."
We encourage you to start with one or two of these combinations and see how they transform your landscape. With a little water and plenty of sunshine, your cannas and their companions will provide a spectacular show from midsummer right up until the first frost.
FAQ
Can I plant cannas with vegetables?
Yes, you can plant cannas near certain vegetables, especially those that like similar conditions. Basil is a great companion as it loves the sun and regular water, and its scent may even help deter some garden pests. However, avoid planting cannas near tomatoes or potatoes, as they can sometimes share similar pests or compete too heavily for the same nutrients in the soil.
Are there any plants I should avoid planting with cannas?
You should avoid planting cannas with anything that requires "dry feet" or sandy, well-draining soil that stays dry, such as lavender, rosemary, or most succulents. The frequent watering that cannas need to look their best would likely cause these plants to struggle with root rot. Additionally, avoid planting very small, slow-growing plants directly under the canopy of tall cannas, as they may get shaded out too quickly.
Do cannas and their companions need a lot of fertilizer?
Cannas are known as "heavy feeders," meaning they use a lot of nutrients to produce their large leaves and flowers. Because their companions like dahlias and zinnias are also prolific bloomers, the entire bed will benefit from regular feeding. We suggest using a balanced fertilizer at planting time and a liquid fertilizer every few weeks during the peak growing season for the best results.
Will cannas crowd out their companion plants?
Cannas grow vigorously and can spread via their underground rhizomes. To prevent them from crowding out smaller companions, give them adequate spacing (about 12–18 inches) at planting time. If you notice a canna is getting too large for its space, you can easily trim back some of the outer leaves or plan to divide the rhizomes the following spring to keep the clump at a manageable size.
Helpful planning resources
If you want to double-check timing before you plant, the Hardiness Zone Map and Shipping Information pages are a useful next step for figuring out when your cannas and companion plants will arrive and when to put them in the ground. (longfield-gardens.com)