Table of Contents
- Introduction
- Understanding Canna Rhizomes
- Choosing the Best Starting Method
- How to Start Canna Bulbs Indoors
- How to Start Canna Bulbs Outdoors
- The Essentials of Canna Care
- Choosing the Right Varieties
- Growing Cannas in Containers
- Simple Troubleshooting
- Transitioning to the Garden
- Preparing for Winter
- Conclusion
- FAQ
Introduction
There is nothing quite like the sight of a canna lily unfurling its first massive, paddle-shaped leaf in the heat of summer. These plants bring an immediate sense of drama and tropical luxury to any backyard. Whether you have a sprawling garden bed or a small sunny balcony, cannas offer a high-impact reward for very little effort. Their vibrant flowers and architectural foliage make them a favorite for gardeners who want big results.
At Longfield Gardens, we want to help you bring this tropical flair to your own outdoor space. If you want to shop first, browse our [Canna Assorted Collection]. Starting canna bulbs—which are technically called rhizomes—is a simple process that anyone can master. In this guide, we will walk you through the best ways to get your cannas growing, whether you want to start them early indoors or plant them directly in the ground. By following a few basic steps, you can enjoy a lush, colorful display from midsummer all the way until the first frost.
Understanding Canna Rhizomes
Before you get your hands in the dirt, it helps to understand what you are planting. While most people call them "canna bulbs," they are actually rhizomes. For a broader overview, see our [All About Cannas] guide. A rhizome is a thick, fleshy underground stem that stores energy for the plant. If you look closely at a canna rhizome, you will see small bumps or points called "eyes." These eyes are where the new stems and leaves will emerge.
Healthy rhizomes should feel firm to the touch, similar to a fresh ginger root. They may come in various sizes depending on the variety, but size is not always an indicator of how tall the plant will grow. Even a small rhizome contains all the energy needed to produce a stunning, full-sized plant in a single season.
When your order arrives, you might notice some white or pink sprouts already beginning to grow. This is perfectly normal and a sign that the plant is ready to get started. If you aren't ready to plant immediately, keep the rhizomes in a cool, dry place in their original packaging until you are ready to begin. If you're ordering ahead, our [Shipping Information] page can help you plan delivery by zone.
Choosing the Best Starting Method
There are two primary ways to start your cannas: starting them early indoors or planting them directly in the garden. The best choice for you depends mostly on where you live and how soon you want to see blooms.
Starting Indoors for an Early Start
If you live in a northern climate with a short growing season, starting cannas indoors is a great way to "cheat" the calendar. By giving them a six-to-eight-week head start, you ensure they are already well-established by the time the weather warms up. This leads to earlier flowers and a much longer display of foliage.
Planting Directly Outdoors
In warmer regions, or if you prefer a lower-maintenance approach, planting directly into the garden is a wonderful option. Cannas are heat-loving plants. They thrive when the soil is warm and the sun is bright. If you have a long summer ahead, planting outdoors in late spring will still give you plenty of time to enjoy their beauty.
How to Start Canna Bulbs Indoors
Starting cannas in pots is a simple project that can be done as early as late March or April. This gives the rhizomes a warm environment to wake up from their winter dormancy.
Selecting the Right Container
Choose a pot that provides enough room for the rhizome to sit comfortably. A pot that is 6 to 8 inches in diameter is usually sufficient for a single rhizome. Ensure the container has plenty of drainage holes at the bottom. While cannas love moisture once they are growing, the rhizomes can rot if they sit in water before they have developed a root system. For more container-specific tips, see our [Planting Canna Bulbs in Containers for Tropical Color] guide.
The Right Potting Mix
Use a high-quality, well-draining potting soil. Avoid using garden soil in containers, as it is often too heavy and can become compacted. A mix containing peat moss, coco coir, or perlite is ideal because it holds just enough moisture while allowing excess water to drain away.
Planting Depth and Direction
Fill your container about halfway with potting mix. Place the rhizome horizontally on the soil. Look for the "eyes" or the remains of last year’s stem. These should point upward. If you can’t tell which way is up, don’t worry. The plant is smart enough to find the light and will eventually grow toward the surface regardless of how it is positioned.
Cover the rhizome with about 1 to 2 inches of soil. Press down gently to remove large air pockets, but do not pack the soil too tightly.
Warmth and Light
Cannas need warmth more than light to begin sprouting. Place your pots in a warm spot, such as near a radiator or on top of a refrigerator. A temperature of 60°F to 70°F is perfect for waking them up.
Once you see the first green shoots peeking through the soil, move the pots to a very sunny window or place them under grow lights. Without enough light, the young plants can become "leggy," meaning they grow tall and weak while searching for sun.
What to do next for indoor starting:
- Check the soil weekly and water only when the top inch feels dry.
- Move to a bright location as soon as green growth appears.
- Begin "hardening off" by taking pots outside for a few hours a day once frost is gone.
- Wait for night temperatures to stay above 50°F before transplanting.
How to Start Canna Bulbs Outdoors
If you prefer to plant directly in the ground, timing is the most important factor. Planting too early in cold, wet soil can cause the rhizomes to struggle. Waiting for the right moment ensures a fast, healthy start.
Waiting for Warm Soil
Wait until the danger of frost has completely passed. A good rule of thumb is to plant your cannas at the same time you would plant tomatoes or peppers. The soil should be at least 60°F. If the ground still feels chilly to the touch, wait another week. Cannas grow very rapidly once the weather is warm, so a short delay will not set you back.
Preparing the Site
Cannas are heavy feeders, meaning they appreciate soil that is rich in nutrients. Before planting, turn over the soil to a depth of about 12 inches. Mixing in a few inches of compost or well-rotted manure will give your plants a significant boost.
Choose a spot that receives at least 6 hours of direct sunlight. While they can grow in partial shade, they will produce more flowers and more vibrant foliage in full sun.
Spacing and Depth
Dig a hole about 4 inches deep. Place the rhizome in the hole horizontally. If you are planting multiple cannas, space them 12 to 24 inches apart. For a more detailed spacing breakdown, see our [How Many Canna Bulbs to Plant Together for a Lush Garden] guide.
- Tall varieties: Space these at least 2 feet apart to allow for their massive leaves.
- Dwarf varieties: These can be spaced about 1 foot apart for a dense, lush look.
Cover the rhizomes with soil and water the area thoroughly to settle the ground around the plant.
The Essentials of Canna Care
Once your cannas have sprouted, they are remarkably easy to care for. They are tough plants that rarely suffer from major issues, provided their basic needs for sun and water are met.
Watering for Success
Cannas are one of the few garden plants that actually enjoy "wet feet." They are native to swampy areas, so they love consistent moisture. During the heat of summer, you may need to water them every day, especially if they are growing in containers.
However, the "deeply but less often" rule still applies in the early stages. Once the plants are about a foot tall, you can increase the frequency of watering. If the leaves begin to curl or the edges turn brown, it is usually a sign that the plant is thirsty.
Fertilizing for Big Blooms
Because they grow so much foliage in a single season, cannas benefit from regular feeding. Use a balanced, slow-release fertilizer at planting time. You can also follow up with a liquid fertilizer every few weeks during the peak growing season of July and August. This supports both the spectacular leaves and the continuous production of flower spikes.
Maintenance and Deadheading
Canna flowers grow on tall stalks, with multiple blooms opening over several weeks. To keep the plant looking tidy and encourage more flowers, remove the individual blooms as they fade. Once an entire flower stalk has finished blooming, you can cut the stalk down to where it meets the next leaf. This prevents the plant from putting energy into seed production and keeps the focus on new growth.
Choosing the Right Varieties
There is a canna for every garden style. At Longfield Gardens, we offer a wide range of colors and sizes so you can find the perfect match for your space.
Foliage-Focused Varieties
Some cannas are grown primarily for their incredible leaves. Varieties like [Canna Tall Pretoria] (also known as 'Bengal Tiger') feature bright green and yellow striped leaves that glow in the sunlight.
Others, like 'Black Knight' or [Canna Tall Australia], have deep burgundy or near-black foliage that provides a stunning contrast to green garden plants.
Flower-Focused Varieties
If you love bright colors, look for varieties known for their large, orchid-like blooms. [Canna Medium City of Portland] offers soft coral-pink flowers, while 'Richard Wallace' provides a cheerful, bright yellow display.
For a classic tropical look, [Lucifer] is a popular dwarf variety with red flowers edged in gold.
Considering Height
Always check the expected mature height of your variety before planting.
- Tall Cannas: [Tall Cannas] can reach 6 to 8 feet tall. These are perfect for the back of a border or for creating a temporary privacy screen.
- Medium Cannas: [Medium Cannas] usually grow 3 to 5 feet tall. These work well in the middle of a flower bed.
- Dwarf Cannas: [Short Cannas] stay under 3 feet tall. These are the best choice for pots and the front of garden borders.
Key Takeaway for Variety Selection: Matching the mature height of the canna to its location in your garden prevents taller plants from shading out smaller ones. Foliage color is just as important as flower color for season-long interest.
Growing Cannas in Containers
Cannas are excellent choices for large patio pots. Their upright growth habit makes them a natural "thriller" in the center of a container arrangement.
Pot Size Matters
Because cannas have large root systems and grow quite tall, they need a heavy, stable base. Choose a pot that is at least 15 to 18 inches in diameter for a single plant. Large plastic or ceramic pots work well because they retain moisture better than terra cotta, which can dry out too quickly for a thirsty canna.
Companion Planting
You can plant other flowers around the base of your canna to create a full, lush look. Trailing plants like sweet potato vine or petunias look wonderful spilling over the edges of a pot. Just make sure your companion plants also enjoy full sun and plenty of water.
Stability in the Wind
Because canna leaves are so large, they can act like sails in a strong breeze. If you live in a windy area, place your containers in a slightly sheltered spot or use heavy pots to prevent them from tipping over.
Simple Troubleshooting
While cannas are generally very healthy, a few simple adjustments can help them look their best.
Slow Sprouting
If your cannas haven't appeared after three weeks, don't worry. They are simply waiting for the right temperature. If the soil is cool, the rhizome stays dormant. You can often speed things up by moving pots to a warmer location or using a heat mat. As long as the rhizome is firm and not mushy, it is healthy and will sprout when it is ready.
Leaf Tattered Edges
The large, soft leaves of cannas can sometimes be torn by high winds or heavy hail. This doesn't hurt the health of the plant, but if a leaf looks very messy, you can simply trim it off at the base. The plant will quickly produce a new, fresh leaf to take its place.
Pests
Cannas are rarely bothered by deer or rabbits, which find the leaves unappealing. Occasionally, you may see small holes from slugs or caterpillars. In most cases, the plant grows so fast that this minor damage is barely noticeable. If you see a rolled-up leaf that won't open, gently peek inside for a "canna leaf roller" caterpillar and remove it by hand.
Transitioning to the Garden
If you started your cannas indoors, they need a short transition period before they live outside full-time. This process is called hardening off.
Start by placing your pots in a shaded, protected spot outdoors for a few hours. Gradually increase the amount of time they spend outside and the amount of sunlight they receive over the course of a week. This allows the leaves to toughen up so they don't get "sunburned" by the intense outdoor light.
Transplant your cannas into the garden on a cloudy day or in the late afternoon to reduce stress on the plants. Once they are in the ground, give them a deep watering to help them settle into their new home.
Preparing for Winter
Cannas are tropical plants and cannot survive freezing temperatures in the ground in most parts of the United States (typically Zones 7 and colder). If you need help checking your area, our [Hardiness Zone Map] is a good place to start. However, they are very easy to save for next year.
After the first frost has blackened the foliage, cut the stems down to about 4 inches. Carefully dig up the clump of rhizomes, shake off the excess soil, and let them air dry in a garage or shed for a few days.
Once dry, store them in a box filled with peat moss or vermiculite. Keep the box in a cool, dark, frost-free place, like a basement or crawlspace. Check them once or twice during the winter; if they look shriveled, a tiny mist of water will keep them hydrated until spring.
Conclusion
Starting canna bulbs is one of the most rewarding ways to add height, color, and a sense of adventure to your summer garden. These plants are built for success, carrying all the energy they need to transform from a simple rhizome into a towering tropical beauty in just a few months. By choosing a sunny spot and keeping the soil warm and moist, you provide everything they need to flourish.
We believe that every gardener deserves the joy of seeing these spectacular plants in bloom. Our [About Us] page explains the 100% Quality Guarantee we stand behind. Whether you start them early on a windowsill or plant them directly in the warm spring soil, the result is always a garden that feels like a private getaway.
- Wait for warm soil (60°F+) before planting outdoors.
- Start indoors 6-8 weeks early for the fastest blooms.
- Give them plenty of sun and consistent water.
- Feed regularly to support their rapid growth.
The most important secret to starting cannas is simply patience; once the summer heat arrives, these plants will grow faster than almost anything else in your garden.
If you want more design ideas for using cannas in the landscape, see our [Fresh Ideas for Growing Cannas] article.
FAQ
How deep should I plant canna rhizomes?
Canna rhizomes should be planted about 4 inches deep when growing outdoors in the garden. If you are starting them in pots indoors, you can cover them with just 1 to 2 inches of potting mix. The goal is to provide enough soil to keep the rhizome moist and stable while allowing the new shoots to reach the surface easily.
Which way is "up" when planting a canna rhizome?
You should plant canna rhizomes horizontally with any visible "eyes" or sprouts pointing toward the sky. If you see the remains of a cut stem from the previous year, that side should also face upward. If the rhizome has no obvious markings, don't worry—place it flat in the soil, and the plant will naturally grow toward the light.
Can I grow canna lilies in pots permanently?
Yes, cannas thrive in containers as long as the pot is large enough and has good drainage. Dwarf varieties are particularly well-suited for permanent container life. Just remember that container plants dry out faster than those in the ground, so you may need to water your potted cannas daily during the hottest part of the summer.
Why are my cannas taking so long to sprout?
Cannas are heat-loving plants and will stay dormant until the soil temperature reaches at least 60°F. If you plant them in cool soil, they may sit for several weeks without showing any growth. This is normal and does not mean the plant is failing; as soon as the weather warms up consistently, they will begin to grow very rapidly.