Table of Contents
- Introduction
- Why Red Leaf Cannas Stand Out
- Choosing the Best Varieties for Your Garden
- Right Plant, Right Place: Site Selection
- When to Plant Red Leaf Canna Bulbs
- How to Plant: Depth and Spacing
- Essential Summer Care
- Troubleshooting Common Canna Questions
- Overwintering: Protecting Your Investment
- Design Ideas for Red Leaf Cannas
- Summary of Success
- FAQ
Introduction
There is something truly magical about the way the morning sun catches the deep, sultry tones of red leaf canna bulbs as they emerge in the garden. These plants are the ultimate "drama queens" of the summer landscape, offering a lush, tropical look that few other perennials can match. Whether you have a sprawling backyard or a sunny balcony, these vibrant plants bring an immediate sense of vacation vibes to your outdoor space.
At Longfield Gardens, we love how Tall Cannas bridge the gap between architectural interest and easy-care reliability. This guide is designed for anyone who wants to master the art of growing these bold beauties, from choosing the right varieties to ensuring they return bigger and better each year. We will cover everything you need to know about site selection, planting techniques, and how to pair these dark-leaved wonders with other summer favorites.
By focusing on a few simple basics—like warm soil and plenty of water—you can transform your garden into a high-impact sanctuary. Let's dive into why these plants are a must-have for your summer garden.
Why Red Leaf Cannas Stand Out
When most people think of cannas, they imagine the classic bright green leaves found in many public parks. While those are lovely, the varieties grown from red leaf canna bulbs offer a completely different level of sophistication. These plants are prized for their foliage, which can range from a smoky bronze and deep burgundy to a chocolatey purple that looks almost black in certain lights. For a broader overview, see All About Cannas.
The beauty of red or bronze foliage is that it provides a permanent "bloom" of color. While flowers may come and go throughout the season, the leaves remain striking from the moment they unfurl until the first frost. This makes them invaluable for garden design, as they provide a dark, moody backdrop that makes neighboring plants with silver, lime green, or bright yellow foliage truly pop.
Furthermore, these varieties are exceptionally versatile. They work just as well as the center "thriller" in a large container as they do when planted in a mass at the back of a flower border. Their vertical growth habit adds height without taking up a massive amount of horizontal footprint, making them ideal for adding structure to the garden.
Choosing the Best Varieties for Your Garden
Not all cannas are created equal, and when you are looking for that specific dark-foliage look, a few standout varieties consistently perform well in US gardens. It is important to choose varieties that match your height requirements and color preferences.
Australia
Often considered the gold standard for dark foliage, 'Australia' is a showstopper. Its leaves are a deep, glossy burgundy-black that stays dark even in the heat of summer. The flowers are a brilliant, clear red, creating a stunning "tone-on-tone" effect that looks incredibly high-end. It typically reaches 4 to 5 feet tall.
Red King Humbert
This is a classic heirloom variety that has been a favorite for generations. What makes 'Red King Humbert' unique is that its foliage is often variegated with splashes of green and bronze, though the overall effect is a dark, moody plant. The flowers are a warm, tomato red. This variety is a vigorous grower and can reach heights of 6 to 8 feet in ideal conditions. If you want a similarly dark-foliage option, Canna Tall Tropicanna Black is a strong choice.
Black Knight
If you want a plant that leans more toward the purple-black end of the spectrum, 'Black Knight' is an excellent choice. It features deep maroon-black foliage and dark red flowers. It is slightly more compact than some of the giant varieties, making it a perfect fit for mid-border placements or large patio pots.
Fascination
For a slightly softer look, 'Fascination' offers bronze-green leaves that have a lovely metallic sheen. The flowers are a unique shade of orange-red that almost looks like a sunset. It is a fantastic choice if you want the drama of red leaf canna bulbs but prefer a warmer, earthier color palette.
Key Takeaway: Choose 'Australia' for the darkest foliage, 'Red King Humbert' for maximum height, and 'Black Knight' for a compact, dark-purple look.
Right Plant, Right Place: Site Selection
The secret to success with cannas is remembering their tropical roots. They crave heat, light, and moisture. If you give them these three things, they will reward you with rapid growth and spectacular color.
Sunlight Requirements
To get the deepest color out of your red leaf canna bulbs, you must plant them in full sun. This means at least 6 to 8 hours of direct sunlight per day. While cannas can grow in partial shade, the foliage will often lose its dark pigment and turn more green than bronze. Additionally, plants in the shade will produce fewer flowers and may grow "leggy" as they reach for the light.
Soil and Drainage
Cannas are not particularly fussy about soil type, but they do best in soil that is rich in organic matter. "Drainage" refers to how quickly water moves through the soil. While cannas love water, they don't want to sit in a stagnant swamp.
If your soil is heavy clay, we recommend mixing in some compost or aged manure before planting. How to Prepare Soil for Planting offers helpful tips for improving drainage and building a better planting bed. If you are planting in containers, use a high-quality potting mix rather than garden soil, as potting mix is designed to hold moisture while still allowing air to reach the roots.
Wind Protection
Because cannas have such large, broad leaves, they can act like sails in a high wind. If you live in a particularly breezy area, try to plant your cannas near a fence, a wall, or a group of sturdy shrubs. This will help prevent the leaves from shredding, keeping your plants looking pristine all summer long.
When to Plant Red Leaf Canna Bulbs
Timing is everything when it comes to planting. Because cannas are tropical plants, they have zero tolerance for frost. Planting too early in cold, damp soil can cause the bulbs (technically called rhizomes) to rot before they ever have a chance to grow.
Wait for Warm Soil
The best time to plant is in the late spring, after all danger of frost has passed and the soil has warmed up to at least 60°F. A good rule of thumb for most US gardeners is to plant cannas around the same time you would plant tomatoes or basil. If you need help checking your timing, use the Hardiness Zone Map.
Starting Early Indoors
If you live in a northern region with a short growing season, you can give your red leaf canna bulbs a head start by "starting" them indoors. About 4 to 6 weeks before the last expected frost, plant the rhizomes in pots and keep them in a warm, sunny spot. By the time the weather warms up outside, you will have established plants ready to go into the ground, which means earlier blooms and more impressive foliage.
How to Plant: Depth and Spacing
Getting the planting depth and spacing right is a simple win that ensures your plants have the room they need to thrive.
Planting Depth
When you look at a canna rhizome, you will see small "eyes" or buds (similar to the eyes on a potato). These eyes should be pointing upward. Plant the rhizome about 2 to 4 inches deep. If you aren't sure which side is the top, don't worry too much—cannas are resilient and will eventually find their way to the surface regardless of how they are positioned.
Spacing for Success
Cannas are fast growers and will spread as they produce new rhizomes underground.
- Tall Varieties: Space these about 18 to 24 inches apart.
- Dwarf Varieties: Space these about 12 inches apart.
- Containers: You can plant them a bit closer in pots for an immediate "full" look, but remember they will need more frequent watering and fertilizing.
Watering After Planting
Once you have tucked your bulbs into the soil, give them a good drink of water to settle the earth around them. However, do not overwater during the first few weeks while the plant is still dormant. Once you see the first green or bronze shoots poking through the soil, you can begin to increase the watering frequency.
What to Do Next:
- Check your local frost dates to determine your planting window.
- Prepare your soil with a few inches of compost.
- Plant rhizomes 2-4 inches deep with "eyes" facing up.
- Water once to settle the soil, then wait for growth to appear.
Essential Summer Care
Once your red leaf canna bulbs have sprouted and are actively growing, they are relatively low-maintenance. However, a little extra attention to water and food will result in much larger leaves and more frequent flowers.
Water Correctly, Not Constantly
Cannas are "thirsty" plants. Unlike many bulbs that prefer to dry out completely, cannas like consistent moisture. In the heat of mid-summer, you may need to water your cannas every day, especially if they are in containers.
The best approach is "deep watering." Rather than a light sprinkle every day, give them a thorough soaking that reaches deep into the root zone. Then, wait until the top inch of soil feels dry before watering again. If you see the edges of the leaves starting to turn brown or "crispy," it is usually a sign that the plant needs more water.
Feeding Your Cannas
Because cannas produce so much foliage and flowers in a single season, they are "heavy feeders." We recommend applying a balanced, slow-release fertilizer at planting time. Once the plants are about a foot tall, you can supplement with a water-soluble fertilizer every 2 to 3 weeks. Look for a fertilizer that is designed for flowering plants, which will help support both the dark leaves and the bright blooms.
Deadheading for More Blooms
"Deadheading" is the process of removing spent flowers. When a flower stalk finishes blooming, you can cut it back to just above the next set of leaves. This prevents the plant from putting energy into producing seeds and encourages it to send up new flower stalks. If you prefer to let the plant look more natural, you can skip this step, but your canna will look tidier if you remove the old blossoms.
Troubleshooting Common Canna Questions
While cannas are generally very healthy plants, you may occasionally run into a few questions as the season progresses. We believe in simple troubleshooting based on the most likely causes.
Why Aren't My Cannas Blooming?
If your plants have beautiful red leaves but no flowers, the most common culprit is a lack of sunlight. Cannas need that 6-8 hours of direct sun to trigger flower production. Another possibility is that the soil is too lean; try adding a bit of fertilizer to give the plant the energy it needs to bloom.
What Is Eating My Leaves?
The most common pest for cannas is the "canna leaf roller." These are small caterpillars that roll themselves up in the leaves, preventing them from unfurling correctly. You may also see small holes in the leaves.
- The Fix: You can often simply unroll the leaf and remove the caterpillar by hand. For larger infestations, consult your local garden center for a caterpillar-specific treatment that is safe for your garden.
My Plant Is Drooping
If your canna looks wilted even though the soil is wet, it might be getting too much wind, or the afternoon sun might just be particularly intense. Usually, the plant will perk back up in the evening once temperatures cool down. If the soil is bone-dry, a deep soak should fix the problem within an hour or two.
Overwintering: Protecting Your Investment
In USDA hardiness zones 8 and warmer, cannas are generally considered perennials and can stay in the ground year-round. However, for those of us in zones 3 through 7, the winter ground freezes will kill the rhizomes. Fortunately, Storing Canna Lily Bulbs Over Winter: A Simple Guide is an easy way to save them for next year.
Lifting the Bulbs
Wait until the first frost of autumn has turned the foliage black or brown. This signals that the plant has gone dormant.
- Cut the stalks down to about 4 inches above the ground.
- Use a garden fork to gently lift the clump of rhizomes out of the soil.
- Shake off the excess dirt, but there is no need to wash them.
Storing for Winter
The goal of storage is to keep the rhizomes cool and dry, but not so dry that they shrivel up completely.
- Place the rhizomes in a cardboard box or a plastic bin with air holes.
- Cover them with slightly damp peat moss, vermiculite, or wood shavings.
- Store the box in a cool, dark place that stays between 40°F and 50°F (like a basement or an insulated crawl space).
- Check on them once or twice during the winter. If they look shriveled, give them a tiny mist of water. If they look moldy, increase the airflow.
Dividing in Spring
One of the best things about cannas is that they multiply! When you take your rhizomes out of storage in the spring, you will likely find that the clumps have grown much larger. You can easily snap or cut them into smaller pieces to create even more plants for your garden. Just make sure each piece has at least one or two "eyes."
Design Ideas for Red Leaf Cannas
The bold architecture of red leaf cannas makes them a designer's favorite. Here are a few ways we like to use them at our trial gardens.
The "Tropical Border"
Pair your red leaf cannas with other large-leafed plants like elephant ears (Colocasia) or hibiscus. The contrast between the dark canna leaves and the massive green leaves of elephant ears creates a jungle-like feel that is incredibly relaxing. Add some bright orange or yellow marigolds at the feet of the cannas to create a fiery color scheme, or tuck in Canna Tall Tropicanna for a bold striped accent.
Dramatic Containers
A single 'Australia' or Canna Tall Pretoria canna in a large, dark-colored pot makes a sophisticated statement at an entryway. Under-plant the canna with "spiller" plants like lime green sweet potato vine or silver dichondra. The bright colors of the trailing plants will emphasize the dark tones of the canna foliage.
Screening and Privacy
Because varieties like 'Red King Humbert' grow so tall so quickly, they are perfect for creating a temporary summer "fence." If you have a patio that feels a bit too exposed to the neighbors, plant a row of red leaf cannas along the edge. By July, you will have a 6-foot-tall wall of beautiful bronze leaves that provides both privacy and a stunning view.
Pollinator Magnets
While we often grow them for their leaves, the flowers of red leaf canna bulbs are highly attractive to pollinators. Hummingbirds, in particular, love the tubular red flowers. If you want to attract more birds to your yard, plant a group of cannas near a window where you can watch the activity.
Summary of Success
Growing canna lilies is one of the most rewarding ways to add big color to your summer garden with very little effort. These plants are tough, fast-growing, and provide a level of visual interest that lasts all season long.
- Sun and Heat: Give them 6+ hours of sun and wait for warm soil before planting.
- Water and Food: Keep the soil moist and fertilize every few weeks during the growing season.
- Variety Choice: Pick a variety that fits your space, whether it's a 3-foot 'Black Knight' or an 8-foot 'Red King Humbert'.
- Winter Care: Lift and store the bulbs in cold climates to enjoy them again next year.
"The deep, moody foliage of a red leaf canna is the perfect anchor for a summer garden, providing constant color even when other flowers take a break from the heat."
At our Lakewood, New Jersey facility, we take great care to ensure that the rhizomes we ship are healthy, true to variety, and ready to thrive in your garden. We stand behind our quality with a 100% guarantee because we want your gardening experience to be as joyful and successful as possible. If you are ready to add some tropical flair to your yard, we invite you to browse our selection at Longfield Gardens and find the perfect red leaf canna bulbs for your space.
FAQ
Can I grow red leaf cannas in pots?
Yes, cannas are excellent container plants. Because they are heavy feeders and love water, choose a large pot (at least 12–15 inches in diameter) with drainage holes and use a high-quality potting mix. For more container-growing tips, see How to Grow Summer Bulbs in Containers. Be prepared to water container-grown cannas daily during the hottest parts of the summer.
How do I know if my canna bulb is still good after winter storage?
A healthy rhizome should feel firm to the touch, similar to a fresh ginger root. If it feels mushy, it has likely rotted and should be discarded. If it feels extremely light and brittle, it may have dried out too much, but you can try soaking it in water for 24 hours to see if it plumps back up before planting.
Do red leaf cannas attract deer?
While no plant is 100% "deer-proof," cannas are generally not a favorite for deer. Their thick, fibrous leaves are less palatable than many other garden plants like hostas or lilies. If deer pressure is very high in your area, you may still see some nibbling, but they are usually considered a deer-resistant option.
Why are the leaves on my canna turning green?
The most common reason for red or bronze leaves turning green is a lack of sunlight. The dark pigments in the foliage require intense UV light to develop fully. If your plant is in a shaded spot, it will produce more chlorophyll (green pigment) to try and capture as much energy as possible. Moving the plant to a sunnier location will usually bring back the dark colors in the new growth.