Table of Contents
- Introduction
- Why Tall Canna Bulbs are Garden Essentials
- Selecting the Best Tall Canna Varieties
- Understanding the "Bulb": What is a Canna Rhizome?
- The Right Plant in the Right Place
- How to Plant Tall Canna Bulbs
- Caring for Towering Cannas
- Creative Ways to Use Tall Cannas in the Landscape
- Seasonal Care and Overwintering
- Simple Troubleshooting for Better Growth
- Realistic Expectations for Your Canna Garden
- Conclusion
- FAQ
Introduction
If you have ever dreamt of transforming your backyard into a lush, tropical paradise, Tall Cannas are your secret weapon. These magnificent plants bring immediate drama, architectural height, and vibrant color to the garden with very little effort. At Longfield Gardens, we love how cannas can turn a plain corner into a show-stopping focal point in just a single growing season. Whether you are a seasoned gardener or just starting your first flower bed, these "garden giants" are exceptionally rewarding to grow.
In this guide, we will explore everything you need to know about choosing, planting, and caring for tall canna varieties, and you can also browse our canna collection to see the full range. We will cover the best ways to integrate them into your landscape for privacy and beauty, as well as simple tips for keeping them healthy all summer long. By focusing on a few basic needs—like sun, water, and warm soil—you can enjoy a spectacular display of towering foliage and exotic blooms from midsummer through the first frost.
Why Tall Canna Bulbs are Garden Essentials
Tall cannas are more than just flowers; they are structural elements that define the shape and feel of your outdoor space. While dwarf varieties have their place in small pots, the tall versions provide a sense of scale that few other summer bulbs can match. Most tall varieties reach heights of 4 to 6 feet, with some exceptional types soaring to 8 feet or more under ideal conditions.
The primary appeal of these plants lies in their dual-purpose beauty. First, there is the foliage. The leaves are large, broad, and paddle-shaped, reminiscent of banana leaves. Depending on the variety, the foliage can be a bright, apple green, a deep forest green, or even a dramatic chocolate-bronze. Some even feature variegated stripes of yellow and white.
Second, the flowers are undeniably striking. Emerging from the tops of the tall stalks, the blossoms come in a fiery palette of reds, oranges, yellows, and pinks. For more ideas on matching bold bloom colors to your style, browse Shop by Color - Spring-Planted Bulbs. They attract pollinators like hummingbirds and butterflies, adding movement and life to your garden. Because they grow so quickly, tall cannas are perfect for gardeners who want a big impact in a short amount of time.
Selecting the Best Tall Canna Varieties
Choosing the right variety is the first step toward success. While all cannas share a similar tropical look, the specific flower and leaf combinations can vary significantly. When browsing for tall canna bulbs, look for those known for their vigorous growth and height. If you need a slightly shorter option, browse our Medium Cannas.
Classic Green-Leafed Favorites
Green-leafed cannas offer a fresh, lush look that makes colorful flowers pop.
- City of Portland: This is a beloved variety that typically reaches about 4 to 5 feet. It features bright green leaves and large, salmon-pink flowers that feel soft and elegant.
- The President: For a traditional look, this variety offers deep red flowers against rich green foliage. It is a sturdy grower that holds its own in the back of a border.
Dramatic Bronze-Leafed Varieties
If you want to add depth and contrast to your garden, bronze or dark-leafed cannas are an excellent choice. The dark foliage creates a sophisticated backdrop for other plants.
- Red King Humbert: This is one of the most iconic tall cannas. It can easily reach 6 feet or more. The foliage is a stunning brownish-purple, and the flowers are a brilliant, velvety red.
- Wyoming: This variety is famous for its height and its intense orange blossoms. The contrast between the bright orange flowers and the dark, bronze-toned leaves is truly spectacular.
Unique Patterns and Colors
- Yellow King Humbert: A fascinating variety that often produces yellow flowers with orange speckles. Interestingly, it sometimes produces a single red flower or bi-color blooms on the same plant. Its foliage is green, providing a bright, cheerful look.
Key Takeaway: When selecting tall cannas, consider both the flower color and the foliage. Darker leaves provide excellent contrast in sunny spots, while green leaves offer a classic tropical feel.
Understanding the "Bulb": What is a Canna Rhizome?
While most gardeners refer to them as "canna bulbs," these plants actually grow from rhizomes. A rhizome is a thick, fleshy underground stem that stores energy and water for the plant. When you receive your order from us, you will notice that the rhizomes look a bit like ginger roots.
Each rhizome has several "eyes" or buds. These are the points where new growth will emerge. A healthy rhizome should feel firm and heavy for its size. Even if a rhizome looks a bit gnarled or unusual, it is packed with the energy needed to produce a massive plant in just a few months. Because cannas are native to warm, tropical regions, these rhizomes are sensitive to cold and prefer to stay dormant until the weather is consistently warm.
The Right Plant in the Right Place
Success with tall canna bulbs starts with choosing the right location. Because these plants grow so large and produce so much biomass in a single season, they have high energy requirements.
Full Sun is Non-Negotiable
To reach their full height and bloom potential, tall cannas need plenty of sunlight. They thrive in "full sun," which means at least six to eight hours of direct light every day. If they are planted in too much shade, they may become "leggy"—stretching toward the light—and they might not produce as many flowers. Sunlight also helps intensify the colors of the bronze-leafed varieties.
Soil and Drainage
Cannas are quite adaptable when it comes to soil, but they perform best in rich, fertile soil that holds some moisture. "Drainage" is a term gardeners use to describe how fast water moves through the soil. While cannas love water, they don't like to sit in stagnant, soggy mud for long periods, which can cause the rhizomes to struggle.
If you have heavy clay soil, adding some compost or well-rotted manure can help improve the texture. If your soil is very sandy, adding organic matter will help it hold onto the moisture and nutrients that these hungry plants need.
Space to Grow
Because you are planting tall varieties, you must give them room to breathe. Crowding cannas can limit their height and make them more susceptible to airflow issues. Plan to space your tall canna rhizomes about 1 to 2 feet apart. This gives each plant enough room to develop a sturdy base and a full canopy of leaves.
How to Plant Tall Canna Bulbs
Planting cannas is a simple process, but timing is the most important factor. Since cannas are tropical plants, they have no tolerance for frost. For more timing guidance, see When Should I Plant Canna Lily Bulbs?.
Timing Your Planting
Wait to plant your canna rhizomes outdoors until the danger of frost has completely passed and the soil has warmed up. A good rule of thumb is to wait until you are planting your tomatoes or other warm-weather vegetables. In most regions, the soil temperature should be at least 60°F. If you plant them in cold, wet soil too early, the rhizomes will simply sit idle.
Step-by-Step Planting Guide
- Prepare the Spot: Loosen the soil to a depth of about 6 to 8 inches. Mix in a little compost if your soil needs a boost.
- Dig the Hole: Dig a hole about 4 inches deep.
- Position the Rhizome: Lay the rhizome in the hole horizontally. While it doesn't matter too much which way the "eyes" are pointing (the plant will find its way up), placing it flat is the most natural position.
- Cover and Water: Fill the hole with soil and firm it down gently with your hands. Water the area well to settle the soil around the rhizome.
For a closer look at placement, see How Deep Do You Plant Canna Bulbs?.
What to do next:
- Check your local frost dates before ordering.
- Pick a sunny spot with at least 6 hours of light.
- Loosen the soil and add compost if available.
- Plant rhizomes 4 inches deep and 1–2 feet apart.
- Water thoroughly immediately after planting.
Caring for Towering Cannas
Once your cannas have sprouted and are starting to grow, they are relatively low-maintenance. However, because they are growing so much in such a short time, they appreciate a little extra attention in two areas: water and food.
Water Correctly, Not Constantly
Cannas are thirsty plants. In their native habitats, they often grow near the edges of ponds or in damp ditches. To get that lush, tropical look, you should keep the soil consistently moist. During the heat of the summer, you may need to water them a few times a week, or even daily if they are in containers.
The best way to water is deeply. Instead of a light sprinkle every day, give them a thorough soaking that reaches deep into the roots. This encourages the plant to grow a strong, stable root system that can support its tall stalks. If the leaves start to roll or look wilted, it is usually a sign that they need a drink.
Feeding Your Garden Giants
Think of tall cannas as "heavy feeders." To produce those massive leaves and constant flowers, they need plenty of nutrients. We recommend using a balanced, all-purpose fertilizer once a month during the growing season. Following the instructions on the fertilizer label will ensure your plants get exactly what they need without overdoing it. A healthy dose of nutrients in midsummer can help sustain their growth all the way into autumn.
Deadheading for More Blooms
"Deadheading" is the practice of removing faded flowers before they turn into seed pods. When you snip off the spent blooms, the plant redirects its energy into producing new flower spikes rather than making seeds. This keeps the plant looking tidy and extends the blooming season. Simply cut the flower stalk back to the next set of leaves or the next visible bud.
Creative Ways to Use Tall Cannas in the Landscape
The height of these cannas makes them incredibly versatile. They aren't just for the middle of a flower bed; they can solve several common landscaping challenges.
Creating a Privacy Screen
If you have a patio or a seating area that feels a bit too exposed to the neighbors, a row of tall cannas can create a beautiful "living fence." Because they grow so fast, they can provide a leafy screen by mid-July that lasts until the first frost. Varieties like 'Wyoming' or 'Red King Humbert' are perfect for this because their thick foliage is almost opaque.
The Back of the Border
In a traditional garden "border" (a long flower bed against a fence or wall), you want the tallest plants in the back and the shortest in the front. Tall cannas provide the perfect permanent backdrop. Their height ensures they won't be hidden by other perennials, and their bold texture provides a nice contrast to finer-leafed plants like ornamental grasses or daisies.
Centerpieces in Large Containers
You don't need a huge backyard to grow tall cannas. They thrive in large pots and planters. For a fuller look in patio displays, see Can Canna Bulbs Be Planted in Pots?. A single tall canna in the center of a pot, surrounded by trailing plants like sweet potato vine or petunias, creates a "thriller, filler, spiller" arrangement that looks professional. Just make sure the container is heavy and stable so it doesn't tip over in a strong wind.
Anchoring Island Beds
If you have a circular garden bed in the middle of your lawn, planting a cluster of tall cannas in the center creates a 360-degree focal point. You can see the bright flowers from across the yard, and the foliage provides a sense of structure to the entire bed.
Seasonal Care and Overwintering
At Longfield Gardens, we want you to enjoy your cannas for many years. How you handle the end of the season depends entirely on where you live.
Gardening in Warm Climates (Zones 8-11)
In the southern parts of the United States, cannas are often perennial. This means they can stay in the ground all year round. After the foliage dies back in late fall, you can simply cut the stalks down to the ground. Adding a layer of mulch over the top can help protect the rhizomes during the occasional chilly night. For help matching plants to your climate, use the hardiness zone map. They will naturally sprout again when the soil warms in the spring.
Gardening in Cool Climates (Zones 3-7)
In colder regions, canna rhizomes cannot survive a freezing winter in the ground. However, saving them is very easy!
- Wait for Frost: Let the first light frost blacken the foliage. This tells the plant it is time to go dormant.
- Cut Back: Cut the stalks down to about 2 to 4 inches above the ground.
- Dig Up: Carefully lift the rhizomes out of the soil with a garden fork.
- Dry and Store: Shake off the excess soil and let them dry in a cool, shaded spot for a day or two. Store them in a cardboard box filled with slightly damp peat moss, perlite, or vermiculite.
- Winter Home: Keep the box in a cool, dark place that stays between 40°F and 50°F, such as an unheated basement or a crawl space.
If you are planning ahead for shipment, review Shipping Information. In the spring, you can divide the rhizomes to create even more plants for your garden. As long as each piece has at least one or two "eyes," it will grow into a brand-new plant.
Simple Troubleshooting for Better Growth
Cannas are generally very healthy, but occasionally you might notice something that doesn't look quite right. Leading with the correct care usually prevents most issues.
- Ragged Leaves: If you see small holes or ragged edges on the leaves, it might be from wind or common garden insects. Planting them in a spot protected from heavy gusts helps keep the leaves pristine. For insects, a simple spray of water from the hose often does the trick.
- Slow Growth: If your cannas aren't reaching their expected height, they likely need more sun or more food. Check that they aren't being shaded by nearby trees and try adding a bit of fertilizer.
- No Flowers: If the plant is tall and green but has no blooms, it might be getting too much nitrogen and not enough phosphorus. Using a balanced fertilizer usually solves this. Also, ensure they are getting enough direct sunlight.
Realistic Expectations for Your Canna Garden
It is important to remember that gardening is a partnership with nature. The exact height your cannas reach will depend on your local weather, soil quality, and how much water they receive. A very hot, dry summer might result in slightly shorter plants if they aren't watered frequently, while a warm, humid summer with plenty of rain is exactly what cannas love.
Patience is also key. Canna rhizomes can take a few weeks to sprout once planted. They spend the first part of the season building a strong root system underground. Once they "take off," however, their growth is remarkably fast. Watching a canna leaf unfurl is one of the simple joys of summer gardening.
Key Takeaway: Success with tall cannas is about the basics. Give them plenty of sun, keep the soil moist, and wait for the heat of summer to see them truly shine.
Conclusion
Tall canna bulbs are an incredible addition to any US garden, offering a unique blend of architectural height and tropical beauty. By choosing the right variety—whether it’s the classic red of 'Red King Humbert' or the soft pink of 'City of Portland'—you can create a stunning outdoor retreat that feels worlds away from the everyday.
At Longfield Gardens, we are committed to helping you succeed with high-quality rhizomes that are ready to grow. Learn more about our 100% Quality Guarantee. Remember that these plants are heavy drinkers and big eaters; give them the sun and nutrients they crave, and they will reward you with a spectacular display.
- Select for height: Choose varieties known to reach 4–6 feet for the best impact.
- Prioritize sun: Ensure at least 6–8 hours of direct sunlight.
- Water and feed: Keep soil moist and use a balanced fertilizer monthly.
- Store safely: If you live in a cold zone, lift and store rhizomes for next year.
"There is nothing quite like the presence of a tall canna in full bloom to make a garden feel complete. Their bold texture and vibrant colors bring a sense of joy and excitement to the summer landscape that is truly unmatched."
We invite you to explore our selection of tall cannas and start planning your most beautiful garden yet. With a little warmth and a bit of water, you’ll be amazed at what these tropical giants can do.
FAQ
How tall do "tall" canna bulbs actually grow?
Most varieties labeled as tall will reach between 4 and 6 feet in a single season. Under ideal conditions—lots of heat, consistent moisture, and rich soil—some varieties like 'Red King Humbert' or 'Wyoming' can even reach 7 or 8 feet.
Can I grow tall cannas in pots on my patio?
Yes, tall cannas grow very well in containers as long as the pot is large and heavy enough. We recommend a container that holds at least 5 to 10 gallons of soil to provide enough weight to prevent the tall stalks from catching the wind and tipping over.
Do I need to stake tall cannas to keep them from falling?
Generally, cannas have very sturdy, thick stalks and do not require staking. However, if you live in a very windy area or if your soil is extremely loose, you might find that a simple bamboo stake provides a bit of extra security during summer storms.
When will my tall cannas start blooming?
Cannas typically begin blooming in midsummer, once the weather has become consistently hot. Depending on your climate and when you planted them, you can usually expect to see the first flowers in July, and they will continue to produce new blooms until the first frost in autumn.