Table of Contents
- Introduction
- Understanding Tall Canna Lily Bulbs
- Top Varieties for Maximum Height
- Choosing the Best Planting Site
- How to Plant Tall Canna Lily Bulbs
- Creative Garden Design with Tall Cannas
- Caring for Your Tall Cannas All Summer
- Managing Pests and Common Issues
- Seasonal Care and Overwintering
- The Joy of Large-Scale Gardening
- Conclusion
- FAQ
Introduction
There is something truly magical about watching a garden reach new heights in a single season. If you are looking for a way to add instant drama and a lush, tropical feel to your backyard, tall canna lily bulbs are the perfect choice. These garden giants can grow several feet tall in just a few months, producing massive leaves and vibrant flowers that command attention.
At Longfield Gardens, we enjoy seeing how these architectural plants transform a standard landscape into an exotic retreat. Whether you want to create a privacy screen or a bold focal point, these easy-to-grow rhizomes offer a high reward for very little effort. This guide is designed for home gardeners who want to understand the best varieties, planting techniques, and care requirements for these towering beauties.
We will cover everything from selecting the right site to overwintering your bulbs so you can enjoy them year after year. By focusing on a few simple steps, you can ensure your cannas grow strong, healthy, and tall.
Understanding Tall Canna Lily Bulbs
Canna lilies are not true lilies, but they are beloved for their upright growth and vibrant presence. While some canna varieties stay small and compact, the Short Cannas are in a class of their own. These plants grow from thick, underground stems called rhizomes, which store the energy needed for their rapid upward growth.
The tallest varieties, such as Canna musifolia, are often grown as much for their foliage as for their flowers. The leaves can be enormous, often resembling banana leaves with their wide, flat shape and prominent veining. Depending on the variety, the foliage may be a deep forest green, a rich bronze, or even strikingly variegated with stripes of red and gold.
In the right conditions, tall canna lily bulbs can produce plants that reach between 6 and 8 feet in height. This rapid growth makes them one of the most effective plants for creating vertical interest. They provide a sense of structure that few other summer-blooming plants can match.
Top Varieties for Maximum Height
When choosing canna varieties with vertical reach, it helps to know which varieties are known for their vertical reach. Not all cannas are destined for the back of the border, so selecting the right rhizome is the first step toward success.
Canna Musifolia (The Grande Canna)
This variety is often called the "World's Tallest Canna" for good reason. It can easily reach heights of 8 feet or more under ideal conditions. While it does produce delicate coral-red flowers late in the season, the real star is the foliage. The leaves are massive, bronze-edged, and have a thick, rubbery texture that stands up well to summer wind and rain.
Tropicanna
If you want a mix of impressive height and neon-bright color, the Tropicanna variety is a fantastic option. It typically grows to about 4 to 6 feet tall. The foliage is spectacularly striped with shades of burgundy, gold, and green. When the sun shines through the leaves, they appear to glow from within. It is topped with bright orange flowers that attract hummingbirds throughout the late summer.
Tall Mixed Collections
For gardeners who want a variety of colors without choosing just one, we offer mixed bags of tall canna lily bulbs. These collections typically include a range of flower colors like red, yellow, pink, and orange. These mixes ensure you have a diverse color palette while maintaining the consistent height needed for a stunning garden backdrop.
Key Takeaway: For the most dramatic height, look for Canna musifolia. For a blend of height and colorful foliage, Tropicanna is a top performer.
Choosing the Best Planting Site
To get the most height out of your tall canna lily bulbs, you must give them what they need most: sun and water. Because these plants grow so quickly, they require a lot of fuel to reach their full potential.
Sunlight Requirements
Cannas are sun-loving plants originating from tropical and semi-tropical climates. To grow tall and produce vibrant blooms, they need at least 6 to 8 hours of direct sunlight every day. If they are planted in too much shade, they may become "leggy," meaning they grow thin and weak as they reach for the light. This can lead to the tall stems falling over during summer storms.
Soil and Drainage
These plants thrive in rich, fertile soil that holds moisture well but still allows excess water to drain away. While they love water, they do not like to sit in stagnant, soggy mud, which can cause the rhizomes to rot. Before planting, you can improve your soil by mixing in some compost or well-rotted manure. This provides the nutrients the plants need for their high-speed growth.
Space to Grow
Tall cannas do not just grow up; they also grow out. A single rhizome can produce a clump that is 2 to 4 feet wide by the end of the season. When planning your garden layout, make sure you leave enough room for the foliage to expand without crowding out neighboring plants. Proper spacing also ensures good airflow, which helps keep the foliage healthy and free of spots.
How to Plant Tall Canna Lily Bulbs
Planting cannas is a straightforward process that yields big results. The most important factor is timing, as these are heat-loving plants that cannot tolerate frost.
When to Plant
Wait until the danger of frost has passed and the soil has warmed up to at least 60°F. In most regions, this is the same time you would plant tomatoes or basil. If you live in a cooler climate, you can start your bulbs indoors in pots about 4 to 6 weeks before the last frost to give them a head start on the growing season.
Planting Depth and Direction
Follow these simple steps for planting your rhizomes:
- Dig a hole or a trench about 4 inches deep.
- Place the rhizome in the hole horizontally.
- Look for the "eyes" or growing points on the rhizome. These are small, bumpy protrusions where the stems will emerge.
- Face the eyes upward, though cannas are resilient enough to find their way up even if planted sideways.
- Cover with soil and press down firmly to remove any large air pockets.
Spacing for Impact
For a dense, hedge-like appearance, space your tall canna lily bulbs about 18 inches apart. If you want them to stand out as individual focal points, give them 24 to 36 inches of space. This extra room allows the massive leaves to spread out fully, showing off their unique shape and color.
Next Steps for Planting Success:
- Check your local frost dates before planting outdoors.
- Amend the soil with organic matter to provide a nutrient boost.
- Ensure the planting site receives at least 6 hours of full sun.
- Water the area thoroughly immediately after planting to settle the soil.
Creative Garden Design with Tall Cannas
The vertical scale of tall canna lily bulbs makes them incredibly versatile in the landscape. They can solve several design challenges while adding beauty.
Creating Privacy Screens
Because they grow so fast and have such large leaves, tall cannas make an excellent "living fence." You can plant a row of them along a property line, a patio, or around a pool to create a private, tropical sanctuary. By mid-summer, they will be tall enough to block unwanted views while providing a lush green backdrop.
The Back of the Border
In a traditional flower bed, you want the tallest plants in the back so they don't hide the smaller ones. Tall cannas are the ultimate "anchor" plant for the rear of a garden bed. They provide a consistent wall of color and texture that makes shorter flowers like zinnias, salvia, or marigolds pop.
Dramatic Containers
You might think a plant that grows 6 feet tall belongs only in the ground, but tall cannas can thrive in containers. Use a heavy container (at least 15-20 gallons) to prevent the wind from tipping the plant over. A large pot of Canna musifolia on a porch or balcony creates an instant "jungle" vibe that feels sophisticated and bold.
Pairing with Companion Plants
To enhance the tropical look, pair your tall cannas with other bold-leafed plants. Elephant ears (Colocasia or Alocasia) are wonderful companions because they share the same love for sun and water. For a contrast in texture, plant fine-leafed ornamental grasses or airy flowers like Verbena bonariensis nearby.
Caring for Your Tall Cannas All Summer
Once your cannas are established, they are relatively low-maintenance. However, a little extra attention can help them reach their maximum height and stay healthy until the first frost.
Watering for Growth
Tall cannas are thirsty plants. Because they produce so much leaf surface area, they lose water quickly through evaporation. During the heat of summer, check the soil frequently. If the top inch of soil feels dry, it is time to water. Deep, regular watering is better than frequent light sprinkles, as it encourages the roots to grow deep into the ground.
Feeding the Giants
These are "heavy feeders," meaning they consume a lot of nutrients to build those massive stems and leaves. Applying a balanced, slow-release fertilizer once a month during the growing season can make a noticeable difference in their height and the number of blooms they produce. You can also use a liquid fertilizer every few weeks for an extra boost.
Deadheading and Grooming
To keep your cannas looking their best, remove spent flowers as they fade. This process, called deadheading, prevents the plant from putting energy into producing seeds and instead directs that energy back into the foliage and future blooms. Simply snip off the individual flower or the entire flower stalk once all the buds on that stem have finished blooming.
If any of the lower leaves turn yellow or get damaged by wind, you can prune them off at the base of the stem. This keeps the plant looking tidy and allows more light to reach the center of the clump.
Managing Pests and Common Issues
While cannas are generally robust, they can occasionally face challenges. The key is to catch any issues early so the plant can continue its upward climb.
Canna Leafrollers
The most common pest for these plants is the canna leafroller. These are small caterpillars that stitch the leaves shut before they can unfurl, eating the tissue from the inside. You may notice small holes in a row across the leaves or leaves that appear stuck in a rolled position.
To manage leafrollers, you can manually unroll the leaves and remove the caterpillars. Some gardeners also find success using a gentle organic spray, such as Bacillus thuringiensis (Bt), which targets caterpillars specifically. Keeping the garden clean of debris at the end of the season can also help reduce the population for the following year.
Wind Damage
Because tall cannas have such large leaves, they can act like sails in a strong wind. While the stems are usually quite strong, they can occasionally snap or lean during a heavy storm. If you live in a particularly windy area, consider planting your tall cannas near a fence or wall for protection. If a stem does lean, you can gently stake it with a sturdy bamboo pole to help it stay upright.
Seasonal Care and Overwintering
Cannas are tropical plants, which means their life cycle depends on the temperature. How you handle them in the autumn depends on where you live.
Gardening in Zones 8-11
In warmer climates (USDA Hardiness Zones 8 to 11), tall canna lily bulbs can stay in the ground year-round. After the first frost kills the foliage, simply cut the stems down to about 2 to 4 inches above the soil. Apply a thick layer of mulch over the area to protect the rhizomes from any occasional cold snaps. New growth will emerge from the ground once the soil warms up in the spring.
Gardening in Zones 3-7
In colder regions, canna rhizomes will freeze and rot if left in the ground over winter. However, you can easily save them to plant again next year.
- Wait for a light frost to turn the foliage brown.
- Cut the stems back to 3 or 4 inches.
- Carefully dig up the rhizomes with a garden fork, being careful not to bruise them.
- Shake off the excess soil and let them "cure" or dry in a shaded, frost-free area for a few days.
- Store the rhizomes in a cardboard box or a breathable bag filled with slightly damp peat moss, vermiculite, or sawdust.
- Keep the box in a cool, dark place (like a basement or crawlspace) where temperatures stay between 40°F and 50°F.
Checking on your stored bulbs once or twice during the winter is a good idea. If the rhizomes look shriveled, mist the packing material with a little water. If any look soft or moldy, remove them to keep the rest of the batch healthy.
Key Takeaway: In cold climates, digging up your rhizomes is an easy way to build your collection over time, as the rhizomes will multiply each year.
The Joy of Large-Scale Gardening
There is a unique sense of accomplishment in growing tall canna lily bulbs. They transform the scale of a garden, making it feel more like a destination and less like a chore. Seeing a 3-inch rhizome turn into a 7-foot tower of green and orange in a single summer is a reminder of how much vitality is packed into a simple bulb.
Gardening should be a rewarding experience, and cannas are some of the most "thankful" plants you can grow. They don't require complicated pruning or delicate care. They simply ask for sun, water, and room to reach for the sky. Whether you are a beginner or a seasoned pro, adding these giants to your yard provides a season-long show that is hard to beat.
Conclusion
Tall canna lilies are a must-have for anyone who wants to bring a bold, architectural element to their landscape. From the massive leaves of Canna musifolia to the vibrant stripes of Tropicanna, these plants offer incredible variety and unmatched growth rates. By choosing a sunny spot, providing plenty of water, and understanding your local climate, you can enjoy a tropical paradise right in your own backyard.
- Select tall varieties for the back of borders or privacy screens.
- Plant in full sun once the soil is warm and the danger of frost has passed.
- Keep plants well-watered and fertilized to support their rapid growth.
- Lift and store rhizomes in cold climates to enjoy them for years to come.
We at Longfield Gardens are here to help you find the perfect plants for your space. We stand behind the quality of our rhizomes and want your garden to be a source of pride and joy all summer long.
"Tall cannas bring a sense of wonder to the garden, proving that with just a little sun and water, nature can achieve incredible heights in a very short time."
FAQ
How tall do tall canna lilies actually grow?
Most tall canna varieties will reach between 5 and 8 feet in height within a single growing season. The exact height depends on the variety and the growing conditions. For example, Canna musifolia is known to reach 8 feet or more when grown in full sun with consistent moisture and rich soil.
Do I need to support or stake tall canna lilies?
Generally, cannas have very sturdy, thick stems that can support their own weight. However, if you live in an area with very high winds or if the plants are grown in partial shade (which makes them reach and become thinner), they might benefit from staking. Using a sturdy bamboo pole or a garden stake can help keep them upright during summer storms.
Can I grow tall canna lily bulbs in pots?
Yes, you can absolutely grow tall cannas in containers. Because they grow so large, you should use a heavy pot that is at least 18 inches in diameter. Using a heavy potting mix and a weighted container helps prevent the tall foliage from acting like a sail and blowing the pot over in the wind.
Why aren't my tall cannas blooming?
If your cannas are growing leaves but no flowers, they may need more sunlight or more nutrients. Cannas require at least 6 to 8 hours of direct sun to produce blooms. They are also heavy feeders, so if your soil is poor, try adding a balanced fertilizer. Keep in mind that some tall varieties, like Canna musifolia, are grown primarily for their foliage and may bloom quite late in the season.