Table of Contents
- Introduction
- Understanding Canna Lily Rhizomes
- Choosing the Best Location
- When to Plant Canna Lilies
- How to Plant Canna Lilies Bulbs Step-by-Step
- Starting Cannas Indoors for an Early Start
- Planting Cannas in Containers
- Caring for Your Cannas After Planting
- Selecting Varieties for Your Garden
- Troubleshooting Common Growth Issues
- Enjoying the Blooms
- End of Season Care and Overwintering
- Conclusion
- FAQ
Introduction
Canna lilies are the ultimate showstoppers of the summer garden. Their bold, banana-like leaves and brilliant blooms bring an instant tropical vibe to any landscape. At Longfield Gardens, we love how these fast-growing plants can transform a simple backyard into a lush retreat with very little effort. If you want the biggest statement, browse our Tall Cannas. Whether you are a first-time gardener or looking to fill a new border, cannas are a rewarding choice that delivers high-impact color.
This guide will walk you through the essential steps for success, from choosing the best spot to the right planting depth. For a broader look at planning and growing them, see All About Cannas. We want to help you enjoy a season full of towering foliage and vibrant flowers. Planting canna lilies is a straightforward way to add vertical drama and vibrant color to any sunny garden spot.
Understanding Canna Lily Rhizomes
Before you get your hands in the dirt, it helps to know what you are planting. While many people refer to them as bulbs, cannas actually grow from rhizomes. A rhizome is a thick, horizontal underground stem that stores energy for the plant.
When you receive your order from us, you will notice these rhizomes look like lumpy, elongated sweet potatoes. They often have small bumps or "eyes." These eyes are the growth points where the new stems will emerge. Understanding this structure helps you position the plant correctly in the soil for the fastest possible growth.
Choosing the Best Location
Cannas are sun-loving plants that thrive on heat. To get the best results, you need to match their tropical nature with the right environment.
Sunlight Requirements
For the most vibrant flowers and lush foliage, pick a spot that receives full sun. This means at least six to eight hours of direct sunlight each day. While cannas can grow in partial shade, they will likely produce fewer flowers and may become "leggy" as they stretch toward the light. If you live in an exceptionally hot climate, a little afternoon shade can prevent the leaves from scorching.
Soil and Drainage
Cannas are not overly picky about soil type, but they do best in soil rich in organic matter. They also appreciate consistent moisture. Unlike many other summer bulbs that rot in damp ground, cannas can handle "wet feet" better than most. However, the soil still needs to provide decent drainage. Drainage simply refers to how fast water leaves the soil after rain or watering.
If your soil is heavy clay, you can improve it by mixing in some compost or aged manure. This helps the soil hold the right amount of moisture while staying loose enough for roots to spread. For more tips on improving a bed before planting, see How to Prepare Soil for Planting.
Wind Protection
Because cannas can grow quite tall, their large leaves can act like sails in high winds. If possible, plant them near a fence, a wall, or a sturdy hedge. This provides a natural windbreak that keeps the foliage looking pristine and prevents the tall flower stalks from leaning.
Key Takeaway: To set your cannas up for success, find a sunny, sheltered spot with rich soil. Good preparation at the start leads to a much more impressive display in mid-summer.
When to Plant Canna Lilies
Timing is everything when it comes to tropical plants. Cannas are sensitive to cold, so you must wait for the right conditions before moving them outdoors.
Wait for Warm Soil
Do not rush to plant your cannas as soon as the first spring flowers appear. The soil needs to be warm—at least 60°F—before the rhizomes will start growing. A good rule of thumb is to plant them around the same time you would put tomato plants in the ground. If the soil is too cold and wet, the rhizome will sit dormant and may even struggle to get started.
Check Your Frost Dates
Always wait until the danger of spring frost has completely passed. In most regions, this is late spring or early summer. If you live in a northern climate with a short growing season, you might feel a bit of pressure to start early. However, waiting for consistent warmth is the best way to ensure vigorous growth. If you are unsure about your local zone, check the Hardiness Zone Map.
How to Plant Canna Lilies Bulbs Step-by-Step
Once the weather is right and your site is ready, follow these simple steps to get your cannas in the ground.
1. Prepare the Planting Site
Loosen the soil to a depth of about 10 to 12 inches. This makes it easy for the new roots to establish themselves. If your soil is lean, this is the perfect time to mix in a few inches of compost.
2. Dig the Hole
Dig a hole that is about 4 inches deep. If you are planting multiple cannas, pay close attention to the spacing. Larger varieties need about 2 feet of space between them to allow for their massive leaves. Smaller or dwarf varieties can be spaced about 1 foot apart.
3. Position the Rhizome
Place the rhizome into the hole horizontally. Look for the "eyes" or any small sprouts already starting to grow. Aim these growth points upward. If you cannot tell which side is the top, do not worry. The plant is smart enough to send its shoots up and its roots down regardless of how it is positioned.
4. Cover and Firm
Fill the hole with soil and gently press down with your hands. This removes large air pockets and ensures the rhizome has good contact with the soil. You should have about 2 to 3 inches of soil covering the top of the rhizome.
5. Water Well
Water the area thoroughly immediately after planting. This settles the soil and tells the plant it is time to wake up.
What to do next:
- Mark the planting spot with a stake or label so you don't accidentally dig it up later.
- Check the soil moisture every few days, keeping it lightly damp.
- Be patient! It can take 2 to 3 weeks to see the first green shoots emerge.
Starting Cannas Indoors for an Early Start
If you live in a zone with a short summer, you can "jump-start" your cannas by planting them in pots indoors. This gives you a head start on the blooming season.
Timing for Indoor Starting
Start your rhizomes about 4 to 6 weeks before the average last frost date in your area. This is usually sometime in March or April for northern gardeners. By the time it is warm enough to plant outside, you will already have established plants ready to take off.
Pots and Potting Mix
Use a pot that is at least 8 to 10 inches wide with good drainage holes. Fill it with a high-quality potting mix. Avoid using garden soil in pots, as it is too heavy and does not drain well in a container environment.
Indoor Care
Place the pots in a warm, sunny window or under grow lights. Keep the soil moist but not soggy. Once the weather warms up, you will need to "harden off" the plants. This means moving them outside for a few hours each day, gradually increasing their time in the sun and wind over the course of a week. This prevents the leaves from going into shock when they are permanently transplanted.
Planting Cannas in Containers
Cannas are excellent candidates for container gardening. They add height to patio displays and look wonderful when paired with trailing plants. For more container-growing tips, see How to Grow Summer Bulbs in Containers.
Choosing the Right Container
Cannas have large root systems and can become top-heavy as they grow. Choose a large, heavy pot—at least 15 to 18 inches in diameter. A heavy ceramic or terra cotta pot is less likely to tip over in a breeze than a light plastic one.
Planting Depth for Pots
The planting process is the same as in the ground. Plant the rhizome about 3 to 4 inches deep. Because pots dry out faster than the ground, you will need to be more diligent about watering. During the heat of summer, container-grown cannas may need water every single day.
Companion Planting
You can mix cannas with other sun-loving plants in the same pot. For a classic "thriller, filler, spiller" look, use the canna as your tall "thriller" in the center. Surround it with "fillers" like lantana or zinnias, and add a "spiller" like sweet potato vine to drape over the edges.
Caring for Your Cannas After Planting
Once your cannas are growing, they are relatively low-maintenance, but a little extra care goes a long way in producing those huge, tropical flowers.
Consistent Watering
Cannas love water. While they are established and fairly drought-tolerant, they will look much better and grow faster if the soil stays consistently moist. If the edges of the leaves start to turn brown and crispy, it is often a sign that the plant is too dry. Deep watering once or twice a week is usually better than a light sprinkle every day.
Fertilizing for Big Results
Cannas are heavy feeders. They need plenty of nutrients to produce all that foliage and those large blooms in a single season. We recommend using a balanced, slow-release fertilizer at planting time. You can follow up with a liquid fertilizer every few weeks during the peak of summer to keep the energy levels high.
Deadheading
To keep the plant looking tidy and encourage more flowers, you should "deadhead" the spent blooms. Deadheading is simply the process of removing faded flowers. When a flower stalk has finished blooming, cut it back to the next side bud or leaf. This prevents the plant from putting energy into seed production and keeps the focus on creating new flowers.
Mulching
Applying a 2-inch layer of mulch around the base of your cannas is a great way to save time. Mulch helps the soil retain moisture and suppresses weeds that might compete for nutrients. Use organic materials like shredded bark or compost for the best results.
Selecting Varieties for Your Garden
At Longfield Gardens, we offer a variety of cannas to suit different spaces and color palettes, including Canna Assorted Collection. Choosing the right variety is part of the fun!
- Tall Varieties: These can reach 5 to 8 feet in height. Varieties like Canna Tall Australia offer stunning dark foliage that creates a dramatic backdrop for other plants.
- Dwarf Varieties: If you have a smaller garden or want to plant in containers, look for Short Cannas. These compact cultivars still offer large, bright flowers.
- Foliage-Focused Varieties: Some cannas are grown as much for their leaves as their flowers. Canna Tall Stuttgart features striking variegated green and white leaves that look beautiful even when the plant is not in bloom.
Troubleshooting Common Growth Issues
Even with the best care, you might run into a few questions as your cannas grow. Most issues are easy to fix with a few simple adjustments. For a fuller care overview, see How to Care for Canna Lily Bulbs.
Why Haven’t My Cannas Sprouted?
If it has been more than three weeks and you see no green, check the soil temperature. If the spring has been particularly cold and wet, the rhizome might just be waiting for more heat. Another possibility is that the rhizome was planted too deep. Most cannas only need about 3 inches of soil over the top.
Ragged or Holes in Leaves
Large, soft leaves are a target for some garden visitors. If you see holes or chewed edges, it is usually from caterpillars or slugs. You can often simply pick these off by hand in the evening. Keeping the area free of debris and fallen leaves also helps reduce hiding spots for pests.
Yellowing Leaves
While it is normal for bottom leaves to turn yellow as they age, widespread yellowing can indicate a nutrient deficiency or poor drainage. Ensure your plant is getting enough fertilizer and that the water isn't sitting in a stagnant pool around the roots.
Key Takeaway: Successful canna gardening comes down to the "big three": heat, sun, and water. If you provide those, the plants will handle the rest of the work themselves.
Enjoying the Blooms
Cannas usually start blooming in mid-to-late summer and will continue right up until the first frost of autumn. The flowers are not just beautiful to look at; they are also highly attractive to pollinators. You can expect to see hummingbirds and butterflies visiting your garden frequently once the cannas are in full swing.
You can also cut the flower stalks to bring indoors for tropical-themed arrangements. While individual flowers may only last a day or two, a single stalk often has multiple buds that will continue to open in the vase.
End of Season Care and Overwintering
As the summer fades, you will need to decide how to handle your cannas for the winter. This depends entirely on where you live.
In Warm Climates (Zones 7–11)
In these regions, cannas are generally hardy. Once the foliage turns yellow or is hit by a light frost, you can cut the stems back to about 4 inches above the ground. Cover the area with a thick layer of mulch to protect the rhizomes from any unusual cold snaps. They will emerge again once the soil warms in the spring.
In Cold Climates (Zones 3–6)
In northern areas where the ground freezes, canna rhizomes will not survive the winter outdoors. You will need to "lift" them if you want to grow them again next year. For a more detailed storage reference, see Winter Storage for Summer Bulbs and Tubers.
After the first frost blackens the foliage, cut the stems back. Carefully dig up the clump of rhizomes, being careful not to nick or bruise them. Shake off the excess soil and let them air dry in a cool, dry place for a few days. Once dry, store them in a box filled with peat moss or sawdust in a basement or crawlspace where temperatures stay between 40°F and 50°F.
Conclusion
Growing canna lilies is one of the easiest ways to bring a bold, exotic look to your home landscape. These resilient plants ask for very little—just a bit of sun, some water, and a warm place to grow. By following the simple steps for planting and care, you can enjoy a garden that feels like a tropical escape all summer long.
- Wait for warm soil (60°F) and the end of frost before planting.
- Choose a sunny spot with rich soil and protection from the wind.
- Plant rhizomes 3 to 4 inches deep with the eyes facing up.
- Water consistently and fertilize for the best blooms.
We are proud to provide high-quality rhizomes to help you start your garden on the right foot. Visit our website to explore our full selection of canna lily bulbs.
"There is a unique satisfaction in watching a small, lumpy rhizome transform into a towering six-foot masterpiece in just a few months. Cannas remind us that the most dramatic results in the garden often come from the simplest efforts."
FAQ
Which way is up when planting a canna lily rhizome?
The rhizome should be planted horizontally with the "eyes" or small growth points facing upward. If you cannot find any eyes, do not worry; just lay the rhizome flat in the hole. The stems will naturally grow toward the surface as they sense the warmth of the sun.
How deep should I plant canna lily bulbs?
Canna lily rhizomes should be planted about 3 to 4 inches deep. This provides enough soil cover to keep the rhizome moist and stable while allowing the new shoots to reach the surface easily. If you are planting in a container, the same depth applies.
How far apart should I space my canna lilies?
Spacing depends on the variety you are growing. Tall varieties that reach 5 to 8 feet need about 2 feet of space to accommodate their wide leaves. Dwarf or compact varieties can be spaced closer together, usually about 12 to 18 inches apart.
Can canna lilies grow in the shade?
While cannas are tough and will survive in partial shade, they really need full sun to perform their best. In the shade, you will get plenty of green leaves, but the plant may not produce many flowers. For the best bloom production, aim for at least six hours of direct sunlight.