Table of Contents
- Introduction
- Understanding the Canna Bulb
- Choosing the Right Canna Varieties
- When to Plant Canna Bulbs
- How to Plant Canna Bulbs for Success
- Starting Canna Bulbs Indoors
- Caring for Your Cannas During the Summer
- Growing Canna Bulbs in Containers
- Overwintering Canna Bulbs in Cold Climates
- Simple Troubleshooting Tips
- Designing a Tropical Oasis
- Quality and Our Guarantee
- Conclusion
- FAQ
Introduction
Nothing says summer quite like the bold, tropical look of a canna lily. The way their massive leaves unfurl and their vibrant flowers reach toward the sun brings an instant energy to the garden. At Longfield Gardens, we love how these plants transform a standard backyard into an exotic retreat with very little effort.
Whether you are a seasoned gardener or just starting your first flower bed, these plants are remarkably rewarding. They are fast-growing, resilient, and provide a vertical element that few other summer-blooming plants can match. This article covers everything you need to know about choosing, planting, and caring for your canna bulbs to ensure a season of spectacular color.
We will walk you through How to Plant a Canna Bulb, from understanding the best soil conditions to protecting them through the winter. By following these practical tips, you can enjoy lush, tropical beauty in any climate. Our goal is to help you feel confident as you bring these show-stopping plants into your own outdoor space.
Understanding the Canna Bulb
While most gardeners refer to them as a canna bulb, these plants actually grow from something called a rhizome. A rhizome is a thick, fleshy underground stem that grows horizontally just beneath the soil surface. This structure stores the energy the plant needs to produce its large leaves and stalks.
When you receive a canna rhizome, you might notice small bumps or points on the surface. These are called "eyes." Just like the eyes on a potato, these points are where the new growth will emerge. A healthy rhizome should feel firm and heavy for its size. If you see a bit of sprout already starting, that is a great sign that the plant is ready to grow.
Because they store so much energy in these rhizomes, cannas are incredibly vigorous. They can grow several feet in a single season, fueled by the nutrients tucked away in that underground "bulb." Understanding that the plant grows horizontally helps you visualize how to space them and how deep to plant them for the best results.
The Anatomy of a Healthy Rhizome
When you handle your rhizomes, look for a few key features. A high-quality rhizome typically has at least two to three eyes. More eyes usually mean more stalks, which leads to a fuller, bushier plant. We ensure our plants are shipped in prime condition so they are ready to hit the ground running as soon as the weather warms up.
Key Takeaway: A "canna bulb" is technically a rhizome. Look for firm, fleshy specimens with visible "eyes" to ensure the most vigorous growth and best floral display.
Choosing the Right Canna Varieties
One of the most exciting parts of gardening is picking the specific colors and sizes that fit your style. Cannas offer a massive range of variety, not just in their flowers but in their foliage as well. Some have deep green leaves, while others feature dramatic bronze, burgundy, or even striped variegated patterns.
Tall and Dramatic Varieties
If you have a large space or want to create a privacy screen, Tall Cannas are an excellent choice. Varieties like 'Red King Humbert' or 'Wyoming' can easily reach five to seven feet in height. These giants are perfect for the back of a flower border or as a focal point in the center of a large bed. Their height adds architectural interest that draws the eye upward.
Compact and Dwarf Varieties
Not every garden has room for a seven-foot tall plant. If you are gardening on a patio or have a smaller suburban lot, City of Portland or 'Richard Wallace' are much easier to manage in containers and still provide those iconic, oversized tropical blooms.
Foliage-First Options
While the flowers are stunning, many gardeners choose cannas specifically for their leaves. 'Pretoria' (also known as 'Bengal Tiger') features bright green leaves with yellow veins, while 'Black Knight' offers dark, moody foliage that contrasts beautifully with bright red flowers. When you choose a variety with interesting foliage, the plant looks beautiful even when it is not in bloom.
When to Plant Canna Bulbs
Timing is everything when it comes to tropical plants. Cannas love heat and are very sensitive to cold temperatures. In most parts of the United States, you should wait to plant them outdoors until the soil has warmed up and all danger of frost has passed.
Matching the Weather
A good rule of thumb is to wait until the soil temperature reaches about 60°F. If the soil is too cold and wet, the rhizome may sit dormant for a long time or even struggle to start. In most regions, this means planting in late spring, around the same time you would put tomatoes or peppers in the ground.
USDA Hardiness Zones
Cannas are perennial in warmer climates, specifically USDA zones 8 through 11. In these areas, the rhizomes can stay in the ground all year round. In zones 3 through 7, they are treated as tender perennials. If you are not sure which zone you garden in, check the Hardiness Zone Map.
Shipping and Arrival
We time our shipments based on your specific gardening zone. Your order will typically arrive about two weeks before the ideal planting time for your area. For order timing details, see our Shipping Information page.
How to Plant Canna Bulbs for Success
Planting cannas is a straightforward process that rewards you with rapid growth. Because they are such heavy feeders and fast growers, taking a few minutes to prepare the spot will make a huge difference in how many flowers you see later in the summer.
Selecting the Best Spot
Cannas are sun-seekers. For the best growth and most vibrant colors, choose a spot that receives at least six to eight hours of direct sunlight every day. While they can grow in partial shade, they will likely produce more leaves and fewer flowers. Sunlight also helps keep the foliage colors intense, especially for those bronze and variegated varieties.
Preparing the Soil
These plants are not particularly picky about soil type, but they do love nutrients and moisture. If your soil is heavy clay or very sandy, adding a few shovels of compost or aged manure can improve the texture. "Drainage" is a term gardeners use to describe how fast water leaves the soil. While cannas like plenty of water, they do not want to sit in a stagnant swamp.
Planting Depth and Spacing
Proper depth and spacing are the quiet winners of a successful garden. Follow these simple steps for planting:
- Dig a hole: Aim for a depth of about four to five inches.
- Placement: Lay the rhizome horizontally in the hole. If you can see the eyes or sprouts, make sure they are pointing upward.
- Spacing: For tall varieties, leave about two feet between plants. For dwarf varieties, one foot of space is usually enough.
- Cover and Water: Fill the hole with soil and press down gently to remove large air pockets. Water the area thoroughly right away to settle the soil around the rhizome.
For a deeper dive on spacing, see How Far Apart Should You Plant Canna Bulbs?.
What to do next:
- Check your local frost dates to ensure the soil is warm enough.
- Clear the planting area of weeds and debris.
- Mix in a little compost if your soil feels dry or rocky.
- Plant the rhizomes horizontally with eyes facing up.
- Water deeply immediately after planting.
Starting Canna Bulbs Indoors
If you live in a northern climate with a short growing season, you can "game the system" by starting your cannas indoors. This gives the plants a four- to six-week head start, meaning they will bloom much earlier in the summer.
Using Pots
Find a container with drainage holes and fill it with a high-quality potting mix. Plant the rhizome just as you would outdoors, covering it with about two to three inches of soil. Place the pot in a warm, sunny window or under grow lights. For more container ideas, see Best Summer Bulbs for Containers.
Managing Moisture and Heat
Inside the house, the soil will dry out faster than it does in the ground. Keep the soil consistently moist but not soaking wet. Cannas also appreciate warmth to wake up from their winter slumber. If your house is cool, placing the pots on a seedling heat mat can speed up the sprouting process significantly.
Hardening Off
Once the weather warms up outside, do not move the plants directly from your living room to the garden. They need to adjust to the wind and intense sun. Move the pots outside for a few hours a day, gradually increasing the time over a week. This process, called "hardening off," prevents the leaves from getting scorched or damaged by the sudden change in environment.
Caring for Your Cannas During the Summer
Once your cannas are established, they are very low-maintenance. They are "strong" plants that can handle the heat of July and August when other flowers might start to wilt. However, a little consistent care will keep them looking their best until the first frost.
Watering Rules
Cannas are thirsty plants. Because they have such large leaves, they lose a lot of moisture through evaporation. During the heat of the summer, they appreciate deep watering. Instead of a light sprinkle every day, try to soak the ground deeply a few times a week. If you are growing them in containers, you may need to water them every day, as pots dry out much faster than garden beds.
Fertilizing for Blooms
To keep the flowers coming, cannas need plenty of fuel. We recommend using a balanced, all-purpose fertilizer every four to six weeks during the growing season. A fertilizer with a slightly higher middle number (phosphorus) can help encourage more flower spikes. Always follow the instructions on the product label for the best results.
Deadheading and Tidying
"Deadheading" simply means removing flowers that have finished blooming. When a flower spike has faded, you can cut it back to where the next bud is forming. This keeps the plant looking tidy and encourages it to put energy into new flowers rather than producing seeds. You can also trim away any tattered or yellowing leaves at the base of the plant to keep the display looking fresh.
Growing Canna Bulbs in Containers
Cannas are fantastic container plants. They provide height and drama to a porch or balcony and can be moved around to change the look of your outdoor space.
If you want a broader set of compact options, our Medium Cannas collection is a good place to start.
Choosing the Right Pot
Because cannas grow large and have heavy foliage, you need a sturdy pot. A small, lightweight plastic pot might tip over in a summer breeze. Choose a container that is at least 12 to 15 inches in diameter for a single dwarf canna. If you want to plant a taller variety, look for an even larger, heavier pot to provide stability.
The Right Potting Mix
Avoid using garden soil in your containers. It is too heavy and does not allow enough air to reach the roots. Instead, use a "soilless" potting mix designed for containers. These mixes usually contain peat moss or coco coir, which holds moisture while still allowing for good drainage.
Combining with Other Plants
Cannas make a great "thriller" in a "thriller, filler, spiller" container design. Place the canna in the center or back of the pot. Surround it with "fillers" like lantana or geraniums, and add "spillers" like sweet potato vine or petunias to trail over the edges. The contrast between the broad canna leaves and smaller flowering plants creates a professional, high-end look.
Overwintering Canna Bulbs in Cold Climates
If you live in a region where the ground freezes (Zones 3-7), your cannas will not survive the winter outdoors. However, you don't have to buy new ones every year. You can easily "lift" the rhizomes and store them in a cool, dry place until next spring.
When to Dig Them Up
Wait until the first frost has blackened the foliage. This signal tells the plant to move its energy down into the rhizome for dormancy. Once the leaves have turned brown or black, cut the stalks down to about three or four inches above the ground.
Lifting and Cleaning
Carefully use a garden fork or shovel to lift the rhizomes out of the soil. Be gentle to avoid slicing into the fleshy roots. Shake off the excess dirt, but you don't need to wash them perfectly clean. Let the rhizomes sit in a dry, shaded area (like a garage or porch) for a few days to "cure" or dry out slightly. For step-by-step help with digging and storing rhizomes, see How to Overwinter Canna Lily Bulbs.
Proper Storage Conditions
Pack the dry rhizomes into a box filled with slightly damp peat moss, vermiculite, or wood shavings. This keeps them from drying out completely without making them so wet that they rot. Store the box in a cool, dark place where temperatures stay between 40°F and 50°F. An unheated basement or a crawl space is usually perfect. Check on them once or twice during the winter; if they look shriveled, a tiny mist of water can help.
Key Takeaway: Overwintering is a simple way to save money and grow even larger plants next year. The key is keeping them cool, dark, and just barely moist.
Simple Troubleshooting Tips
Cannas are generally very healthy, but like any plant, they can occasionally run into issues. Most problems are easy to solve if you catch them early.
Pests to Watch For
In some regions, canna leafrollers can be an issue. These are small caterpillars that stitch the leaves together before they unfurl. If you see leaves that look stuck or have holes in a straight line, you may have leafrollers. You can often simply unroll the leaf and remove the pest by hand. Slugs and snails might also nibble on young shoots in the spring. Using a bit of bird-safe slug bait or organic copper tape can help protect your new growth.
Lack of Blooms
If your canna is all leaves and no flowers, it is usually due to one of three things:
- Not enough sun: Move the plant to a brighter spot next year.
- Not enough water: Ensure the soil stays moist during the peak of summer.
- Hungry plants: Try a fertilizer with a bit more phosphorus to jumpstart the blooming process.
Remember that gardening is a learning process. If a plant doesn't perform perfectly the first time, a small change in location or watering can make all the difference the following season.
Designing a Tropical Oasis
Cannas are versatile design tools. Because they are so vertical, they work well in places where you need to fill a gap quickly.
Privacy Screens
If you have a neighbor's fence or an ugly utility box you want to hide, a row of tall cannas acts like a living wall. By mid-July, a dense planting of 'Red King Humbert' will create a lush screen that blocks the view while providing beautiful flowers for you to enjoy.
Color Echoes
Try to match the color of your canna flowers or foliage with other plants in your garden. For example, the orange blooms of a 'Wyoming' canna look incredible next to the dark purple leaves of a 'Black Knight' variety. You can also pair green-leaved cannas with bright yellow marigolds or zinnias to create a sunny, cheerful corner. For more color ideas, see our Red, Orange, and Yellow Summer Blooms collection.
Attracting Pollinators
Cannas are not just for humans; they are also a favorite for pollinators. Hummingbirds are particularly drawn to the bright red and orange tubular flowers. Placing a few cannas near a window or patio allows you to watch these tiny birds visit your garden throughout the day.
Quality and Our Guarantee
At Longfield Gardens, we take pride in the quality of our plants. We work closely with trusted growers to ensure that every canna bulb we ship is true to variety and in excellent health. We maintain our own trial gardens to observe how these varieties perform in real-world conditions. This allows us to provide you with practical, honest advice based on what actually works.
We stand behind our products with a 100% quality guarantee. We want your plants to arrive in prime condition, ready to grow. If there is a damage or quality issue upon delivery, please contact our responsive customer service team right away. We are here to support your gardening journey and want you to be successful. If a plant has a performance issue during its first growing season, we may provide a replacement, store credit, or a refund depending on the circumstances. Our goal is for you to enjoy a beautiful, stress-free garden.
Conclusion
Growing cannas is one of the easiest ways to bring a sense of adventure and luxury to your home landscape. From their massive, architectural leaves to their brilliant, hummingbird-attracting flowers, these plants offer a high reward for very little effort. By getting the basics right—sun, water, and timing—you can create a stunning summer display that lasts for months.
- Choose the right size for your space, whether tall for drama or dwarf for pots.
- Wait for warm soil and sunny days before planting outdoors.
- Keep your plants hydrated and fed for the best floral show.
- Store your rhizomes in a cool place over winter to enjoy them again next year.
We encourage you to try a few different varieties this season. Gardening is about discovery and enjoyment, and cannas are the perfect companion for a beautiful summer. Visit our website to browse our current selection and find the perfect match for your yard.
"The bold textures and vibrant colors of cannas bring a unique energy to the garden that lasts from the heat of July until the first autumn frost."
FAQ
Can I grow cannas in pots on my balcony?
Yes, cannas are excellent for containers. For best results, choose dwarf varieties that stay under four feet tall and use a large, heavy pot to prevent it from tipping over in the wind. Ensure your pot has drainage holes and that you water the plant daily during the hottest parts of the summer. For a more detailed pot-sizing guide, see How Many Canna Bulbs Per Pot?.
Why are my canna leaves turning brown at the edges?
Brown edges are often a sign of "thirst" or heat stress. Because cannas have such large leaves, they lose water quickly in high temperatures and wind. Ensure you are watering deeply and consistently. Adding a layer of mulch around the base of the plant can also help hold moisture in the soil.
Do I have to dig up my canna bulbs every year?
This depends on your USDA hardiness zone. If you live in zones 8-11, you can leave your cannas in the ground all year. In zones 3-7, the ground freezes deep enough to damage the rhizomes, so you should lift and store them indoors if you want to keep the same plants for next year.
How deep should I plant my canna rhizomes?
Plant your canna rhizomes about four to five inches deep in the garden. If you are starting them in pots indoors, two to three inches of soil cover is usually sufficient. Always plant them horizontally and try to point any visible sprouts or "eyes" toward the sky.