Introduction
There is something undeniably exciting about the first signs of tropical growth in a summer garden. The way a canna lily unfurls its broad, banana-like leaves feels like bringing a piece of the tropics right to your backyard. At Longfield Gardens, we love how these statuesque plants transform a standard landscape into a lush, vibrant oasis with very little effort. Whether you are planting them in large patio containers or as a dramatic backdrop in your flower beds, the goal is always the same: healthy plants and spectacular blooms.
If you are getting ready to plant, you might be wondering about the best way to get them started. A common question many gardeners ask is whether they should soak their canna lily bulbs—properly known as rhizomes—before putting them in the ground. While it is not a strictly required step for success, a little bit of preparation can go a long way in helping these heat-loving plants wake up and start growing. For a convenient place to begin shopping, explore the canna lily collection.
In this guide, we will answer the question of whether you should soak your canna rhizomes and explain the most effective ways to jumpstart your garden. We will cover everything from the benefits of pre-planting hydration to the best techniques for planting and care. This information is designed to help both beginners and experienced gardeners achieve the best possible results this season.
Soaking can be a helpful tool in your gardening kit, but it is just one part of the process. We want to ensure your gardening experience is rewarding and simple. By understanding what these plants need from the very first day, you can enjoy a summer filled with bold colors and impressive foliage.
The Short Answer: Do You Need to Soak?
The direct answer to whether you should soak canna lily rhizomes is that it is often helpful but rarely essential. Canna lilies grow from thick, fleshy underground stems called rhizomes. These rhizomes store energy and moisture, which allows the plant to survive during its dormant period. If your rhizomes arrive feeling firm, heavy, and plump, they already have plenty of moisture stored up and are ready to grow as soon as they hit warm soil.
However, if you notice the rhizomes feel a bit lightweight or look slightly shriveled, a short soak can be very beneficial. This extra bit of hydration helps "wake up" the plant and signals that it is time to start pushing out roots and sprouts. Think of it as a refreshing drink after a long winter nap.
Most gardeners find that while soaking can speed up the sprouting process by a few days, the most important factors for success are actually soil temperature and moisture. Cannas are tropical plants that thrive in warmth. If you plant a soaked rhizome into cold, wet soil, it may still sit dormant until the ground warms up. If you choose to soak, do so with the goal of giving the plant a head start in a controlled, warm environment.
When Soaking Makes the Most Sense
Deciding whether to soak your canna rhizomes often depends on the condition of the bulbs when you receive them. When we ship rhizomes from our facility in Lakewood, New Jersey, we ensure they are in prime condition. However, because these are living plants, their appearance can vary.
If your rhizomes have visible "eyes" (the small, pointed bumps where new growth emerges) that are already starting to swell or show green, they are already active. In this case, soaking is less necessary because the plant has already begun its growth cycle. You can simply plant them directly into the soil or a pot.
On the other hand, if the rhizomes are very firm and the eyes are still tight and dormant, a soak can help soften the outer skin. This makes it easier for the new shoots to break through. It is also a good practice if you live in a region with a very short growing season. By soaking or "pre-sprouting" your cannas, you can squeeze every possible day out of the summer sun.
Key Takeaway: Soaking is most beneficial for rhizomes that appear dry or are being started early in the season to maximize bloom time. If your rhizomes are already sprouting, you can skip the soak and go straight to planting.
How to Properly Soak Canna Lily Rhizomes
If you decide that a soak is the right choice for your garden, the process is very simple. You do not need any special equipment or chemicals—just a bit of patience and some clean water.
Step-by-Step Soaking Instructions
- Use Lukewarm Water: Fill a shallow bowl or bucket with lukewarm water. Avoid using very cold or very hot water, as extreme temperatures can shock the plant tissue.
- Submerge the Rhizomes: Place your canna rhizomes in the water. They do not need to be deeply submerged; just enough water to cover them is plenty.
- Keep it Brief: Let the rhizomes soak for at least two hours, but usually no more than 12 to 24 hours. While they love moisture, leaving them in standing water for several days can lead to rot by cutting off oxygen to the plant.
- Plant Immediately: Once you remove the rhizomes from the water, plant them right away. Do not let them sit out and dry back out, as this defeats the purpose of the soak.
A Note on Water Quality
For most home gardeners, standard tap water is perfectly fine for soaking. If you have a water softener that uses a lot of salt, you might prefer using captured rainwater or filtered water, though it is usually not a major concern for a short soak. The main goal is simply to rehydrate the cells of the rhizome so they can begin the metabolic process of growing.
Alternative Ways to Jumpstart Growth
While soaking is one way to get things moving, many experienced gardeners prefer a method called "pre-starting" or "potted starts." This is often more effective than soaking alone, especially if you live in the northern half of the United States.
Because canna lilies are tropical, they really do not like to grow until the soil is consistently warm—usually around 60°F or higher. In many zones, the air might feel warm in May, but the ground is still quite chilly. If you plant your rhizomes directly into cold garden soil, they may sit for three or four weeks before you see any green leaves.
Starting Cannas in Pots
To get a jump on the season, you can plant your rhizomes in pots indoors about four to six weeks before the last expected frost. The canna lily indoor-starting guide offers another helpful reference for this process.
- Choose a well-draining potting mix: Use a light, fluffy mix rather than heavy garden soil.
- Plant at a shallow depth: Put the rhizome about 3 to 4 inches deep in the pot.
- Provide warmth: Place the pots in a warm spot, such as near a sunny window or on a heat mat.
- Water sparingly at first: Give them one good watering to settle the soil, then wait until you see sprouts before watering regularly.
By the time the weather is warm enough to plant outside, you will have a sturdy plant with several leaves already growing. This method often results in blooms weeks earlier than direct planting in the ground.
What to Do Next:
- Check your local frost dates to determine the best time to start.
- Gather clean pots and a high-quality potting mix.
- Decide if you want to soak for a few hours before potting up to give them an extra boost.
Understanding the Canna Rhizome
To garden successfully, it helps to understand what is happening beneath the surface. A canna "bulb" is actually a rhizome, which is a horizontal underground stem. If you look closely at a canna rhizome, you will see segments and small bumps. These bumps are the "eyes," similar to the eyes on a potato.
Each eye has the potential to become a new stalk. When you plant the rhizome, roots grow from the bottom and sides, while the eyes push upward to become the leaves and flowers. This horizontal growth habit is why cannas tend to spread out and form beautiful, dense clumps over time.
When you are handling your rhizomes, be gentle with the eyes. If a small sprout has already started and it accidentally gets knocked off, the plant will usually grow another one from a nearby node, but it is best to keep the primary sprouts intact. This ensures the plant uses its stored energy as efficiently as possible.
Planting Basics: Depth and Spacing
Whether you soaked your rhizomes or not, getting the planting depth and spacing right is one of the "quiet winners" of successful gardening. It is a simple step that makes a big difference in how the plant performs. For additional guidance, see this canna planting and timing guide.
How Deep to Plant
In the garden, canna rhizomes should be planted about 4 to 6 inches deep. If you are planting in a container, 4 inches is usually sufficient. Planting at this depth protects the rhizome from temperature swings and provides enough soil "weight" to keep the tall stalks from tipping over as they grow.
Which Way is Up?
Lay the rhizome horizontally in the hole. If you can see the eyes or sprouts, point them upward. If it is hard to tell which side is which, do not worry—the plant is smart enough to send its roots down and its shoots up regardless of how it is positioned. Planting it horizontally is the most natural way for the rhizome to grow.
Spacing for Success
Cannas are vigorous growers and need room to breathe.
- Tall varieties: Space these about 12 to 18 inches apart.
- Dwarf or compact varieties: These can be spaced 10 to 12 inches apart.
Giving them enough space ensures good air circulation, which helps keep the foliage healthy. It also prevents the plants from competing too much for water and nutrients, resulting in larger, more impressive flowers.
Choosing the Right Spot: Sun and Soil
The "right plant, right place" rule is very important for cannas. You can soak your rhizomes perfectly and plant them at the exact right depth, but if they are in the shade, they will not reach their full potential.
Sunlight Requirements
Cannas are sun-worshippers. To get the best flower production and the most vivid foliage colors, they need full sun. This means at least 6 to 8 hours of direct sunlight each day. While they can grow in partial shade, they will often become "leggy" (tall and thin) and produce fewer flowers. If you are growing a variety with dark burgundy or variegated leaves, full sun helps those colors stay intense and saturated.
Soil and Drainage
"Drainage" refers to how fast water leaves the soil. While cannas love moisture more than many other summer bulbs, they do not like to sit in stagnant, soggy water.
- In the garden: If you have heavy clay soil that stays wet for a long time, consider planting in raised beds or amending the soil with compost to improve the structure.
- In containers: Always use a pot with drainage holes at the bottom. This allows excess water to escape, keeping the rhizomes healthy.
One of the unique things about cannas is that they are quite adaptable. They can actually handle "wet feet" better than most bulbs and are often used near the edges of ponds. However, for the average garden bed, a well-draining, moisture-retentive soil is the ideal middle ground.
Water Correctly, Not Constantly
Proper watering is the key to maintaining those lush, tropical leaves all summer long. After you first plant your rhizomes, the soil should be moist but not saturated. Over-watering before the plant has roots can lead to problems.
Once the plant is established and you see active growth above ground, you can increase your watering. During the heat of the summer, cannas are thirsty plants. The best approach is to water deeply, allowing the moisture to reach the root zone, and then let the top inch of soil dry out slightly before watering again.
If you are growing cannas in containers, they will dry out much faster than those in the ground. On very hot days, a container-grown canna might need water every day. If the leaves start to roll inward, it is often a sign that the plant is thirsty and trying to conserve moisture.
Feeding Your Cannas for Better Blooms
Because cannas grow so much in a single season—some reaching 6 feet or more—they are what gardeners call "heavy feeders." They require a good amount of nutrients to support all that growth and flower production.
When you first plant, you can mix some compost or a balanced, slow-release fertilizer into the soil. Once the plants are about a foot tall, you can begin a regular feeding schedule. Using a water-soluble fertilizer every few weeks is an easy win that keeps the plants vigorous and the flowers coming. Always follow the instructions on the fertilizer label for the best results.
Key Takeaway: Consistent water and regular feeding are the two most important factors for keeping cannas looking "nursery-fresh" through the end of the summer.
Canna Lily Varieties to Explore
Choosing the right variety is the fun part of the process. At Longfield Gardens, we offer a range of sizes and colors to fit any garden style. For compact selections, browse the Short Cannas collection.
Here are a few popular types you might consider:
- Orange Punch: A compact variety that reaches about 4 feet tall. It features stunning peach-orange flowers with yellow streaks.
- Salmon Pink: Ideal for smaller spaces or the front of a border, this variety stays around 3 feet tall and offers soft, elegant pink blooms.
- Tropical Bronze: Known for its dramatic bronze foliage and scarlet red flowers, this variety provides a high-contrast look.
- Stuttgart: A favorite for foliage lovers, it has striking white and green variegated leaves and delicate orange flowers.
- Black Knight: Features deep, dark foliage that is almost black, topped with brilliant red blossoms.
When selecting, consider the height. Tall varieties are great for hiding a fence or creating a summer privacy screen, while dwarf varieties are perfect for "thriller" plants in the center of a large pot.
Managing Pests and Maintenance
Cannas are generally very sturdy and easy to care for, but there are a few things to keep an eye on to ensure they stay looking their best.
Common Pests
The most common visitors are Japanese beetles and canna leaf rollers.
- Japanese Beetles: These can chew holes in the leaves. In many cases, you can simply pick them off by hand and drop them into a bucket of soapy water.
- Leaf Rollers: These are small caterpillars that use silk to roll the leaf shut before it unfurls. If you see leaves that are "stuck" or have rows of holes when they open, this is likely the cause. Removing damaged leaves or using a gentle organic spray can help manage them.
Deadheading
"Deadheading" is the process of removing faded flowers. For cannas, this is very simple. Once a flower cluster has finished blooming, snip the stem off just above the next leaf or flower bud. This keeps the plant looking tidy and encourages the plant to put its energy into producing more flowers rather than seeds.
Overwintering Canna Lilies
In most of the United States, canna lilies are treated as annuals or tender perennials. If you live in USDA zones 8 through 11, you can often leave them in the ground year-round with a bit of mulch for protection. You can also review the All About Cannas guide for additional growing information.
However, if you live in Zone 7 or colder, the rhizomes will not survive a hard freeze in the ground. Many gardeners choose to dig them up and store them for the winter. This is a great way to save money and grow even larger plants the following year.
- Wait for the first frost: This will turn the foliage brown.
- Cut back the stalks: Trim them down to about 4 to 6 inches.
- Lift the rhizomes: Carefully dig them up, taking care not to bruise them.
- Dry and store: Let them air dry for a few days in a frost-free area, then store them in a box with slightly damp peat moss or sawdust. Keep them in a cool, dark place (like a basement) where they won't freeze.
For a more detailed walkthrough, see this guide to overwintering canna bulbs.
Growing Cannas in Containers
If you don't have a lot of garden space, cannas are excellent container plants. Their upright growth habit makes them a perfect centerpiece. When planting in pots, follow these simple rules:
- Use a large pot: A container that is at least 15 to 18 inches wide is ideal for a single large canna.
- Weight the bottom: Cannas can get top-heavy. If you are using a plastic pot, consider putting a few heavy stones at the bottom before adding soil to prevent it from blowing over in the wind.
- Fertilize more often: Because you are watering more frequently, nutrients leach out of the soil faster. Feed your potted cannas every 2 weeks for the best display.
Pairing cannas with trailing plants like sweet potato vine or colorful annuals like coleus can create a professional-looking arrangement that lasts all summer. For mixed containers, browse the Assorted Cannas collection.
Realistic Expectations for Your Canna Garden
Gardening is a partnership with nature, and while we provide the best quality plants, things like weather and local soil play a large role. It is important to remember that cannas are heat-lovers. If you have an unusually cool or cloudy spring, your cannas may take longer to get started. This is perfectly normal and not a sign of failure.
Once the summer heat arrives, you will be amazed at how quickly they grow. A small rhizome can turn into a 5-foot-tall flowering machine in just a few months. If your plant doesn't bloom immediately, give it time and plenty of sun. The foliage itself is often beautiful enough to stand on its own while you wait for the flowers to arrive.
We stand behind the quality of our products with a 100% guarantee. Our goal is for your items to arrive in prime condition and be true to the variety you ordered. If you ever have a concern about the quality of your rhizomes upon delivery, please contact us promptly so we can help. We want you to feel confident and excited as you start your gardening journey. Learn more about the Longfield Gardens guarantee.
Conclusion
So, do you soak canna lily bulbs before planting? While not a requirement, a short soak of 2 to 12 hours is a simple, effective way to rehydrate dormant rhizomes and give them a boost as they start their growing season. Whether you choose to soak them, pre-start them in pots, or plant them directly in the warm garden soil, the key is providing the warmth and sun these tropical beauties crave.
Cannas are one of the most rewarding plants to grow because they offer so much visual impact for relatively little work. By following the basics of right plant, right place, and keeping them well-fed and watered, you can enjoy a stunning display that lasts from mid-summer through the first frost.
- Soak for 2-12 hours if rhizomes feel dry or lightweight.
- Plant 4-6 inches deep in full sun once the soil is warm.
- Water deeply and provide regular fertilizer for the best blooms.
- Space plants 12-18 inches apart to allow for healthy growth and airflow.
Growing a beautiful garden should be a source of joy, not stress. At Longfield Gardens, we are here to support you with quality plants and practical advice. Pick out your favorite colors, find a sunny spot, and get ready to enjoy a spectacular, tropical summer right at home.
FAQ
How long should I soak my canna lily rhizomes?
You should generally soak them for at least 2 hours, but no more than 12 to 24 hours. A brief soak is enough to rehydrate the tissues, while soaking for too long can limit the oxygen available to the plant and potentially cause the rhizome to rot.
Can I plant canna lilies in the shade?
While canna lilies will grow in partial shade, they really need full sun (6 to 8 hours a day) to produce the best flowers and maintain their vibrant foliage color. In too much shade, the plants often become weak and may not bloom at all.
Is it better to start cannas in pots or in the ground?
If you live in a northern climate with a shorter growing season, starting them in pots indoors 4 to 6 weeks before the last frost is usually better. This gives the plants a head start so you can enjoy flowers sooner. In warmer climates, planting directly in the ground is perfectly fine. For container-specific advice, see how to plant canna lily bulbs in pots.
How do I know which way to plant the canna rhizome?
The best way is to lay the rhizome horizontally in the soil. If you see any small bumps or "eyes," point those toward the sky. If you aren't sure, don't worry—as long as the rhizome is buried at the correct depth, the plant will naturally grow toward the light.
