Table of Contents
- Introduction
- Understanding Canna Lily Rhizomes
- When to Start Canna Lily Bulbs
- How to Start Canna Lily Bulbs Indoors
- Planting Canna Lily Bulbs Directly in the Garden
- Caring for Your Cannas After They Start
- Choosing Varieties for Your Space
- Simple Troubleshooting for New Growth
- Lifting and Storing for Next Year
- Summary of the Canna Starting Process
- FAQ
Introduction
There is nothing quite like the excitement of seeing the first broad, tropical leaves of a canna lily unfurl in the garden. These plants bring an immediate sense of lush, island-inspired beauty to any landscape, regardless of where you live. At Longfield Gardens, we love how cannas transform a standard backyard into a vibrant retreat with their bold foliage and brilliant blooms. Whether you are a seasoned gardener or just starting your first flower bed, cannas are incredibly rewarding and surprisingly easy to grow.
This guide will walk you through everything you need to know about starting canna lily bulbs—technically called rhizomes—so you can enjoy a season full of high-impact color. We will cover the best timing for planting, how to start them early indoors, and the simple steps for planting them directly into your garden beds. By following a few basic principles, you can ensure these sun-loving plants thrive from the moment they sprout.
Understanding Canna Lily Rhizomes
Before we dig into the planting process, it helps to understand what you are working with. While most people refer to them as bulbs, cannas actually grow from rhizomes. 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 known as "eyes." These eyes are the growth points where the new stems and leaves will eventually emerge.
When you receive your rhizomes from us, you may notice they vary in size and shape. A high-quality rhizome should feel firm and heavy for its size. Larger rhizomes with more eyes typically produce larger, more vigorous plants with more stems. This extra energy storage helps the plant establish itself quickly once it hits the soil.
Cannas come in a wide range of sizes and colors, which makes them incredibly versatile. You might choose a compact variety like Canna ‘Orange Punch’ or ‘Salmon Pink’ for containers, or a towering variety like ‘Black Knight’ to create a dramatic living screen. Understanding the mature size of your chosen variety will help you determine the best starting method and location in your yard.
When to Start Canna Lily Bulbs
Timing is everything when it comes to heat-loving plants like cannas. Because they are native to tropical and subtropical climates, they are sensitive to cold temperatures. The most important rule for success is to wait until the environment is warm enough for them to wake up and grow.
Starting Indoors for a Head Start
Many gardeners in cooler climates choose to start their canna lilies indoors. This is an excellent way to extend your growing season and get flowers much earlier in the summer. We recommend starting your rhizomes in pots about 4 to 6 weeks before your average last frost date. By the time the weather is warm enough to move them outside, you will already have established plants with several inches of growth.
Planting Directly in the Garden
If you prefer to plant directly into the soil, patience is your best friend. Canna rhizomes should not go into the ground until the soil has warmed to at least 65°F. In many parts of the country, this happens in late May or even early June. If you plant them while the soil is still cold and damp, the rhizomes will simply sit dormant, and there is a risk they could rot before they ever get the chance to grow. Waiting for that consistent warmth ensures the plant hits the ground running.
Key Takeaway: Cannas love heat. Whether starting indoors or out, wait for warm temperatures to ensure your rhizomes sprout quickly and stay healthy.
How to Start Canna Lily Bulbs Indoors
Starting cannas in pots is a simple project that can be done on a porch, in a greenhouse, or even on a sunny windowsill. This "pre-starting" method is highly effective for gardeners in northern zones who want to maximize their bloom time.
Step 1: Choose the Right Pot
You do not need a massive container to start your rhizomes, but it should be large enough to hold the rhizome comfortably with an inch or two of space on all sides. A pot that is 6 to 8 inches in diameter is usually perfect for a single rhizome. Make sure the container has drainage holes at the bottom. Drainage refers to how fast water leaves the soil; cannas like moisture, but they do not like to sit in a pool of stagnant water.
Step 2: Prepare the Potting Mix
Use a high-quality, well-draining potting soil. Avoid using heavy garden soil from your yard, as it can become compacted in a pot and prevent the roots from getting the oxygen they need. A mix containing peat moss, perlite, or coco coir is ideal. These ingredients keep the soil "fluffy" and allow excess water to flow through easily.
Step 3: Planting the Rhizome
Fill your pot about halfway with soil. Lay the rhizome horizontally on top of the soil. If you can see the eyes or any small sprouts, point them upward. If it is hard to tell, do not worry—the plant will naturally figure out which way is up as it grows. Cover the rhizome with 2 to 3 inches of soil and gently pat it down to remove any large air pockets.
Step 4: Warmth and Light
Place your pots in a warm spot. A room temperature of 70°F or higher is ideal for triggering growth. Light is not strictly necessary until the first sprouts break through the soil surface. Once you see green shoots, move the pots to a very bright window or under grow lights. Without enough light, the new growth will become "leggy," meaning the stems will be thin, weak, and overly long as they stretch toward the sun.
What to do next:
- Check the soil moisture every few days; keep it lightly damp but not wet.
- Once sprouts appear, ensure they get at least 6 to 8 hours of bright light.
- Begin "hardening off" (gradually exposing them to outdoor air) about a week before transplanting.
- Wait until nighttime temperatures are consistently above 50°F before moving them outside permanently.
Planting Canna Lily Bulbs Directly in the Garden
If you have plenty of garden space and a long enough growing season, planting directly into the ground is the most straightforward method. This is often the best choice for large-scale plantings or for creating "hedges" of color along a fence line.
Selecting the Perfect Spot
Cannas are true sun-worshippers. To get the best foliage color and the most flowers, choose a location that receives at least 6 to 8 hours of direct sunlight every day. While they can grow in partial shade, they often become taller and floppier, and they will produce fewer blooms.
Soil quality also matters. Cannas are "heavy feeders," which means they use a lot of nutrients to produce those massive leaves. If your soil is sandy or lacks nutrients, mixing in some compost or well-rotted manure before planting will give your plants a significant boost.
Step-by-Step Garden Planting
- Loosen the Soil: Use a garden fork or spade to loosen the soil to a depth of about 6 to 8 inches. This makes it easier for the new roots to spread out.
- Dig the Hole: Dig a shallow hole about 3 to 4 inches deep.
- Position the Rhizome: Place the rhizome in the hole horizontally. If you are planting multiple cannas, space them 1 to 2 feet apart, depending on the variety. Larger types like ‘Tropical Bronze’ need more room than dwarf varieties.
- Cover and Water: Fill the hole with soil and water the area thoroughly. This initial watering settles the soil around the rhizome and "wakes up" the plant.
Key Takeaway: For direct planting, wait for warm soil and choose the sunniest spot in your yard to ensure your cannas reach their full potential.
Caring for Your Cannas After They Start
Once your canna lilies have successfully sprouted, they grow incredibly fast. In the peak of summer heat, you can almost see them getting taller by the day. To keep that momentum going, there are three main things to focus on: water, food, and grooming.
Watering for Success
Cannas are thirsty plants. Unlike many other bulbs that prefer to dry out between waterings, cannas thrive with a consistent supply of moisture. In fact, they are one of the few ornamental plants that can handle "wet feet," making them great choices for the edges of ponds or rain gardens. If the weather is hot and dry, you may need to water them every day, especially if they are growing in containers.
A simple rule for watering is to check the top inch of soil. If it feels dry, it is time to water. Apply water at the base of the plant rather than over the leaves to keep the foliage looking its best and to reduce the risk of leaf issues.
Feeding Your Plants
Because they grow so much foliage in a single season, cannas appreciate a regular "snack." We recommend using a balanced, water-soluble fertilizer once a month throughout the growing season. This provides the nitrogen needed for those beautiful leaves and the phosphorus required for vibrant flowers. Follow the instructions on the fertilizer label for the best results.
Deadheading and Grooming
To keep your cannas looking tidy and to encourage more flowers, you should practice "deadheading." This simply means cutting off the flower stalks once the blooms have faded. When you remove the old flowers, the plant redirects its energy into producing new flower spikes rather than creating seeds.
You should also remove any tattered or yellowing leaves throughout the season. Use a clean pair of garden shears and cut the leaf stem close to the main stalk. This keeps the plant looking fresh and tropical all summer long.
Choosing Varieties for Your Space
At Longfield Gardens, we offer a wide variety of cannas to suit different garden needs. Selecting the right one for your specific goals makes the "starting" process much more rewarding.
Compact Varieties for Containers
If you have a small patio or want to add height to a mixed container, look for compact varieties.
- Canna Short Pink Magic: This variety stays around 3 feet tall and features soft, elegant blooms that look stunning against deep green leaves.
- Canna ‘Orange Punch’: A compact grower that packs a visual punch with bright, multi-colored flowers.
Tall Varieties for Privacy and Drama
For the back of a flower border or to hide an unsightly fence, tall varieties are the way to go.
- Canna Tall Tropicanna Black: This is a showstopper with dark, almost burgundy foliage and intense red flowers. It can easily reach 5 to 6 feet in height.
- Canna ‘Tropical Bronze’: Known for its warm, copper-toned leaves and brilliant scarlet blooms, this variety adds a high-end look to any landscape.
Foliage-Focused Varieties
Sometimes the leaves are the main event. Canna Tall Stuttgart or ‘Stripe Beauty’ feature variegated leaves with white or yellow stripes. These are excellent for adding texture to the garden even when the plants aren't in bloom.
Simple Troubleshooting for New Growth
Most of the time, starting canna lily bulbs is a worry-free process. However, if your rhizomes are slow to start, there are usually very simple explanations.
Why Haven't My Cannas Sprouted?
The most common reason for a delay is temperature. If the soil is below 60°F, the rhizome will remain in a "sleep" state. If you have planted them outdoors and it has been a cool spring, simply wait for a few days of hot weather. You will often see them pop up almost overnight once the sun warms the earth.
Another factor is planting depth. If you plant a rhizome too deep—say, more than 6 inches down—it will take a long time for the sprout to reach the surface. Aim for that 3 to 4-inch "sweet spot" for the best results.
Dealing with Pests
Cannas are generally very hardy, but they can occasionally attract "leaf rollers." These are small caterpillars that stitch the edges of a leaf together before it unfurls. If you notice a leaf that looks stuck or rolled up, you can often simply unroll it and remove the pest by hand. Keeping your garden free of debris and removing old stalks at the end of the year helps reduce pest populations for the following season.
Soil and Drainage
If you notice your canna leaves turning yellow or the plant looking wilted despite frequent watering, check the drainage. While cannas love moisture, the soil should not be a swamp of stagnant, smelly water. If the water cannot leave the soil, the roots cannot breathe. Ensure your pots have holes and your garden beds aren't in a low spot where water sits for days after a rain.
Lifting and Storing for Next Year
In most parts of the United States (USDA Hardiness Zone Map), cannas are treated as annuals or tender perennials. This means they will not survive the winter in the ground because the freezing temperatures will damage the rhizomes. However, you do not have to buy new ones every year!
When to Dig Them Up
Wait until the first frost of autumn has turned the foliage brown or black. This signal tells the plant to move its energy down into the rhizome for the winter. Cut the stalks down to about 4 inches above the ground.
How to Store
Carefully dig up the clump of rhizomes using a spade or garden fork. Shake off the excess soil and let them dry in a shady, frost-free spot for a few days. Once dry, place them in a cardboard box or a paper bag filled with slightly damp peat moss or vermiculite. Store the box in a cool, dark place that stays between 45°F and 50°F, such as a basement or crawl space. For more step-by-step detail, see our How to Successfully Store Canna Bulbs for Winter.
In the spring, you can take these rhizomes out, divide them by cutting them into smaller pieces (making sure each piece has at least one "eye"), and start the whole process over again.
Key Takeaway: Storing cannas is a budget-friendly way to grow your collection. Just keep them cool, dark, and slightly insulated through the winter months.
Summary of the Canna Starting Process
Starting canna lily bulbs is a straightforward process that rewards you with some of the most dramatic growth in the plant world. Whether you choose to jump-start them in pots or plant them directly into the sunshine, success comes down to heat, water, and light.
- Warmth is Key: Wait for 65°F soil or start indoors 6 weeks before frost.
- Horizontal Planting: Place rhizomes flat, 3–4 inches deep.
- Sun and Water: Give them 6+ hours of sun and never let the soil dry out completely.
- Feeding: Use a balanced fertilizer monthly to support large leaves and flowers.
- Storage: Dig them up after the first frost if you live in a cold climate to save them for next year.
Growing cannas is one of the easiest ways to add a professional, high-impact look to your home garden. These plants are resilient, fast-growing, and truly spectacular when they hit their peak in late summer.
We are here to help you succeed in every step of your gardening journey. At Longfield Gardens, our goal is to provide the quality plants and practical advice you need to create a space you love. To learn more about our promise, read our 100% Quality Guarantee. If you are ready to bring a touch of the tropics to your yard, starting a few canna rhizomes is the perfect place to begin. Happy planting!
FAQ
Do I need to soak canna rhizomes before planting?
While it is not strictly necessary, soaking your canna rhizomes in lukewarm water for two to three hours before planting can help "wake them up." This rehydrates the tissue and can sometimes lead to slightly faster sprouting, especially if the rhizomes appear very dry. However, if you skip this step and simply water them well after planting, they will still grow perfectly fine.
How long does it take for cannas to sprout?
In ideal conditions—warm soil and plenty of moisture—you will usually see the first green tips appearing within two to three weeks. If the weather is cool or the soil is dry, it may take four weeks or longer. If you are starting them indoors in a warm room, you might see growth even sooner.
Can I grow cannas in pots permanently?
Yes, cannas are excellent container plants. When growing them in pots for the whole season, choose a large container (at least 12–15 inches wide) to accommodate their vigorous root systems. Compact varieties like ‘Salmon Pink’ are particularly well-suited for permanent container life, though even tall varieties can thrive in very large, heavy pots.
Which way is "up" on a canna rhizome?
Canna rhizomes should be planted horizontally (flat) in the soil. If you see any small bumps or "eyes," these should face upward toward the sky. If you see remnants of old roots, those should face downward. If you are unsure, simply lay it flat; the plant is designed to send shoots up and roots down regardless of its initial orientation.