Canna Lily Bulbs How to Plant

Table of Contents

1. Introduction
2. Understanding Canna Lily Rhizomes
3. Choosing the Right Location
4. When to Plant Canna Lily Bulbs
5. Preparing the Soil for Success
6. How to Plant Canna Lily Bulbs: A Step-by-Step Guide
7. Planting Canna Lilies in Containers
8. Caring for Your Cannas Throughout the Season
9. End-of-Season Care
10. Variety Selection for Your Garden
11. Summary Checklist for Planting Cannas
12. Conclusion
13. FAQ

Introduction

If you want to transform your backyard into a lush, tropical oasis, there is no plant more capable of doing the heavy lifting than the canna lily. With their massive, paddle-shaped leaves and vibrant, iris-like blooms, canna lilies bring an immediate sense of drama and scale to the landscape. Many gardeners are surprised to learn that these exotic-looking showstoppers are incredibly easy to grow, even in cooler climates. At Longfield Gardens, we enjoy these plants for their ability to thrive in the heat of summer when other flowers might begin to fade.

In this guide, we will walk you through everything you need to know about canna lily bulbs, from selecting the right spot to the specific steps for planting and care. Whether you have a sprawling garden bed or a small sunny balcony, cannas offer a versatile solution for season-long color. By focusing on a few simple requirements like soil temperature and moisture, you can enjoy a stunning display of tropical beauty from midsummer through the first frost. For a broader overview, see our All About Cannas.

Understanding Canna Lily Rhizomes

Before we dig into the planting process, it is helpful to understand what you are working with. While they are often called "canna lily bulbs," these plants actually grow from rhizomes. A rhizome is a thick, fleshy underground stem that stores energy and nutrients for the plant.

When you receive your rhizomes from us, you will notice they look like textured, elongated roots with small bumps or points. These bumps are called "eyes," and they are the points where new growth will emerge. Because these rhizomes are full of stored energy, cannas grow with remarkable speed once the conditions are right. This makes them an excellent choice for gardeners who want a high-impact look in a single growing season.

Key Takeaway: Canna lilies grow from rhizomes, which are thick underground stems. The "eyes" on the rhizome are the growth points that will eventually become the leaves and flowers of your plant.

Choosing the Right Location

The first step in learning how to plant canna lily bulbs is finding the perfect spot in your yard. Because cannas are tropical in nature, they have a few non-negotiable preferences for sun and soil.

Sunlight Requirements

To get the most vibrant flower colors and the largest leaves, your cannas need full sun. This means a spot that receives at least six to eight hours of direct, unfiltered sunlight every day. While cannas can grow in partial shade (about four to six hours of sun), they will often grow taller and more "leggy" as they reach for the light, and they will produce fewer flowers. If you are growing dark-foliage cannas, full sun also helps those colors remain intense and saturated.

Soil and Drainage

Cannas are unique among many summer-blooming plants because they are quite thirsty. They thrive in soil that is rich in organic matter and stays consistently moist. However, there is a difference between "moist" and "waterlogged."

If your planting site has standing water that remains for hours after a heavy rain, you will want to improve the drainage before planting. You can do this by mixing in compost, leaf mold, or well-rotted manure. These amendments help the soil hold onto the moisture the cannas need while allowing excess water to move through so the rhizomes do not sit in a swampy environment.

Protection from Wind

If you are planting taller varieties, consider the wind. The large leaves of cannas act like sails in a breeze. While the stems are strong, extreme winds can sometimes tatter the edges of the beautiful foliage. Planting them near a fence, a wall, or a group of sturdy shrubs can provide a helpful windbreak.

When to Plant Canna Lily Bulbs

Timing is perhaps the most important factor when planting cannas. These are heat-loving plants that have no tolerance for frost.

Watching the Soil Temperature

We recommend waiting to plant your canna rhizomes until the soil temperature has reached at least 60°F. A good rule of thumb for many US gardeners is to plant cannas around the same time you would put your tomato plants in the ground. If the soil is too cold and wet, the rhizomes will simply sit dormant, which increases the risk of them rotting before they can start growing.

Planting by Zone

Your USDA Hardiness Zone Map determines whether cannas can stay in the ground all year.

• Zones 8-11: In these warmer regions, cannas are generally hardy and can stay in the ground year-round.
• Zone 7: This is a "swing" zone. In mild winters, cannas may survive with a thick layer of mulch, but many gardeners choose to lift them just to be safe.
• Zones 3-6: In these cooler climates, canna rhizomes must be planted in the spring and lifted in the fall after the first frost kills the foliage.

Preparing the Soil for Success

Once you have found your sunny spot and the weather is warm, it is time to prep the area. Because cannas grow so fast and produce so much biomass, they are "heavy feeders." This means they need plenty of nutrients in the soil.

1. Loosen the ground: Use a garden fork or spade to loosen the soil to a depth of about 10 to 12 inches.
2. Add organic matter: Mix in a 2- to 4-inch layer of compost. This improves the soil structure and provides a slow-release source of nutrients.
3. Check the pH: Cannas prefer a slightly acidic to neutral soil pH (around 6.0 to 7.0). Most garden soils fall into this range naturally, but if you have very alkaline soil, adding compost will help balance it out.

How to Plant Canna Lily Bulbs: A Step-by-Step Guide

Whether you are planting directly into the ground or starting them in pots, the process is straightforward.

Direct Planting in the Garden

If you are planting directly into the ground after the danger of frost has passed, follow these steps:

1. Dig the hole: Dig a hole about 4 inches deep.
2. Position the rhizome: Lay the rhizome horizontally in the hole. Look for the "eyes" or any small sprouts. Point these upward if possible. If you can't tell which way is up, don't worry—the plant will figure it out and grow toward the light.
3. Spacing: Give them plenty of room. Space rhizomes 1 to 2 feet apart. Smaller, dwarf varieties can be spaced closer (about 12 inches), while the towering 6-foot varieties need at least 2 feet of space to allow for air circulation.
4. Cover and firm: Cover the rhizome with 2 to 3 inches of soil. Gently press down with your hands to remove any large air pockets.
5. Water: Water the area thoroughly right after planting to settle the soil.

Starting Cannas Indoors

If you live in a region with a short growing season (like the northern US), you can get a head start by starting your rhizomes indoors. This gives you flowers much earlier in the summer.

1. Timing: Start them about 4 to 6 weeks before your average last frost date.
2. Potting: Use a pot with drainage holes and a high-quality, well-draining potting mix.
3. Planting: Plant the rhizome 2 inches deep in the pot.
4. Care: Keep the pot in a warm, sunny window or under grow lights. Keep the soil lightly moist but not wet.
5. Transplanting: Once the weather is consistently warm and the threat of frost is gone, move the pots outside for a few days to "harden off" before transplanting them into the garden.

What to do next:

• Check your local frost dates to determine your planting window.
• Purchase high-quality compost or organic matter to enrich your soil.
• Ensure you have a sunny spot cleared of weeds and debris.
• Order your favorite canna varieties from a trusted source.

Planting Canna Lilies in Containers

Cannas make fantastic container plants. They provide height and a tropical feel to patios and decks. When planting in containers, the rules are slightly different than planting in the ground.

Choosing the Right Container

Cannas have vigorous root systems and large rhizomes. You need a sturdy pot that won't tip over when the plant reaches its full height. For a single standard-sized canna rhizome, choose a container that is at least 15 to 18 inches in diameter. If you are planting dwarf varieties, you can use slightly smaller pots or plant multiple rhizomes in a large planter.

Container Planting Steps

1. Drainage is key: Ensure your container has at least one large drainage hole. While cannas love water, they do not like to sit in stagnant water at the bottom of a pot.
2. Use potting mix: Never use garden soil in a container. It is too heavy and will compact over time. Use a lightweight potting mix that contains perlite or vermiculite for aeration.
3. Depth and spacing: Plant the rhizome 2 to 3 inches deep. If you are mixing cannas with other plants (like trailing petunias or sweet potato vines), place the canna in the center as the "thriller" and the other plants around the edges.
4. Watering frequency: Containers dry out much faster than garden beds. In the heat of summer, you may need to water your container-grown cannas every single day.

Caring for Your Cannas Throughout the Season

Once your cannas have sprouted and are growing, they require very little maintenance beyond the basics of food and water.

Watering Needs

Cannas are not drought-tolerant plants. For the best growth, the soil should stay consistently damp. During dry spells or extreme heat, provide a deep soaking once or twice a week. If you notice the edges of the leaves turning brown or crispy, it is usually a sign that the plant is thirsty.

Applying a thin layer of mulch (such as shredded bark or straw) around the base of the plants can help retain soil moisture and keep the roots cool.

Fertilizing for Big Blooms

Because cannas grow so much foliage in a short amount of time, they need plenty of fuel. We recommend using a balanced, slow-release fertilizer at planting time. Once the plants are about a foot tall, you can supplement with a water-soluble fertilizer every few weeks to encourage more blooms. A fertilizer with a slightly higher middle number (phosphorus) can help boost flower production.

Deadheading

As the flowers fade, you should remove them. This is called deadheading. Canna stems often produce multiple flower clusters on a single stalk. Snip off the individual spent flowers to keep the plant looking tidy. Once an entire flower stalk has finished blooming, you can cut that stalk back to the next set of leaves. This encourages the plant to put its energy into producing new flower spikes rather than seeds.

End-of-Season Care

The way you handle your cannas at the end of the summer depends on where you live.

In Warm Climates (Zones 8-11)

In the fall, after the flowers have finished, you can leave the foliage alone until it naturally turns yellow or is nipped by a light frost. At that point, cut the stems down to about 4 inches above the soil. Apply a layer of mulch for the winter, and the plants will emerge again in the spring. Every 3 to 4 years, you may want to dig up the clumps and divide them to prevent overcrowding.

In Cold Climates (Zones 3-7)

For those of us in the north, cannas are treated as "tender perennials." This means we need to protect the rhizomes from freezing.

1. Wait for frost: Wait until the first frost turns the foliage black or brown. This signals the plant to go dormant.
2. Cut back: Cut the stems down to about 4 to 6 inches.
3. Dig gently: Use a garden fork to carefully lift the clump of rhizomes out of the ground. Be sure to dig a foot or so away from the stem to avoid slicing the rhizomes.
4. Clean and dry: Shake off excess soil. Let the rhizomes air-dry in a frost-free, shaded area (like a garage or shed) for a few days.
5. Store: Store the rhizomes in a box filled with slightly damp peat moss, vermiculite, or wood shavings. Store the box in a cool, dark, frost-free place (40°F to 50°F is ideal) until next spring.

Variety Selection for Your Garden

At Longfield Gardens, we offer a canna assortment to fit different garden needs. When choosing your varieties, consider both the flower color and the foliage.

• Dwarf Varieties: These typically grow 2 to 3 feet tall and are perfect for the front of a border or for smaller containers.
• Tall Cannas: These can reach 5 to 6 feet (or more!) and make excellent living privacy screens or focal points at the back of a flower bed.
• Foliage Options: You can choose from classic green, deep burgundy, or even variegated leaves with stripes of yellow, white, or orange. Varieties like Tropicanna are famous for their multicolored leaves that look like stained glass when the sun shines through them.

Key Takeaway: Choosing a mix of tall and dwarf varieties with different leaf colors allows you to create a layered, multi-dimensional garden display that looks good even when the plants aren't in bloom.

Summary Checklist for Planting Cannas

If you want to ensure success, follow this simple checklist as you get started:

• Wait until soil is 60°F or warmer before planting.
• Select a site with at least 6-8 hours of direct sun.
• Amend the soil with compost to improve nutrition and moisture retention.
• Plant rhizomes 2-4 inches deep and 12-24 inches apart.
• Position rhizomes horizontally with eyes pointing upward.
• Water thoroughly immediately after planting.
• Keep soil consistently moist throughout the growing season.
• Fertilize regularly to support rapid growth and heavy blooming.

Conclusion

Planting canna lily bulbs is one of the most rewarding ways to add a professional, high-impact look to your home landscape. These resilient plants ask for very little—just sunshine, water, and warm soil—and in return, they provide a spectacular display of color and texture that lasts for months. Whether you use them as a tall backdrop in a garden bed or as a centerpiece in a patio container, they never fail to impress.

At Longfield Gardens, our goal is to help you feel confident in the garden, and we stand behind every order with a 100% Quality Guarantee. By following these simple steps for planting and care, you can enjoy the lush, tropical beauty of cannas in your own yard this summer.

Gardening is an ongoing journey of discovery. Start with a few canna rhizomes this spring and watch how they transform your outdoor space into a vibrant sanctuary.

FAQ

Which way is up when planting a canna lily rhizome?

The rhizome should be planted horizontally. If you see small bumps or points (the eyes) or any new sprouts, point those toward the sky. If the rhizome is smooth and you cannot tell, simply lay it flat; the plant is naturally programmed to send roots down and shoots up.

How long does it take for cannas to bloom after planting?

Once the weather is warm, cannas are very fast growers. You can typically expect to see your first flowers within 10 to 12 weeks of planting. If you start your rhizomes indoors several weeks before the last frost, you may see blooms even earlier in the summer.

Can I grow canna lilies in the shade?

While cannas can survive in partial shade, they will not perform their best. They need the energy from full sun to produce those large leaves and frequent flower spikes. In the shade, the plants often become thin and tall, and the flower production will be significantly reduced.

Do I need to dig up my canna lily bulbs every year?

This depends on your USDA hardiness zone. If you live in Zone 8 or warmer, your cannas can stay in the ground year-round. If you live in Zone 7, they may survive with heavy mulch. In Zones 6 and colder, you must dig them up and store them indoors for the winter to keep them from freezing.