Introduction
There is nothing quite like the excitement of watching a tropical garden come to life in your own backyard. Canna lilies are the stars of the summer show, offering oversized, paddle-shaped leaves and brilliant blooms that make any landscape feel like a high-end resort. At Longfield Gardens, we believe these spectacular plants are one of the most rewarding additions a gardener can make, regardless of their experience level.
If you have just brought home your first set of canna rhizomes, you might find yourself turning them over in your hands, wondering which side faces the sky. This is a common question for both beginners and seasoned pros because cannas look a bit different than a traditional "pointed" bulb like a tulip. This guide will help you identify the right orientation for your canna lilies and provide the simple steps needed to get them growing vigorously. For more canna inspiration, browse our cannas articles.
Understanding how to position these unique plants is the first step toward a summer filled with lush, vibrant color. Once you know what to look for, planting becomes a quick and joyful part of your spring routine. If you need help timing planting in your area, check our Shipping Information.
Identifying Your Canna Lily Rhizomes
Before we talk about which way to plant them, it is helpful to understand what you are actually holding. While most people call them "canna lily bulbs," they are technically rhizomes. A rhizome is a thick, fleshy underground stem that grows horizontally. It acts as a storage unit for the plant, holding all the energy and nutrients needed to produce those massive leaves and tall flower stalks.
When you look at a canna rhizome, you will notice it is lumpy and irregular. It might look a bit like a piece of ginger root from the grocery store. You will see several distinct features: the "eyes," the roots, and sometimes the remnants of last year’s stems. Identifying these parts is the key to knowing which way is up.
Finding the Eyes
The "eyes" of a canna lily are the most important part to locate. These are small, pointed bumps or buds on the surface of the rhizome. They are often pink, white, or light green. These eyes are the growth points where the new stems and leaves will emerge.
In some cases, the eyes may have already started to sprout during shipping or while sitting in your warm house. If you see a small, pointy shoot beginning to grow, that is your clearest indicator of which side should face the sun. Even if the eyes are dormant and flat, they are the "business end" of the plant.
Spotting the Roots and Stems
On the opposite side of the eyes, you may find the remains of old, thin, stringy roots. These are usually brownish and brittle. They are the leftovers from the previous growing season and do not necessarily indicate where the new roots will grow. New roots will actually emerge from the bottom and sides of the rhizome once it is tucked into the soil.
You might also see a circular, woody scar or a short stump on the rhizome. This is the "neck" where last year’s foliage was cut away. This stump is a reliable signpost; it should almost always be positioned so it is facing the sky or tilted slightly upward.
Key Takeaway: Canna lilies grow from thick underground stems called rhizomes. The small, pointed bumps (eyes) are the growth points that need to face upward toward the light.
Canna Lily Bulbs: Which Way Up?
The short answer is that canna lily rhizomes are best planted horizontally. Unlike a daffodil bulb, which has a clear "bottom" (flat) and "top" (pointed), a canna rhizome is designed to sit flat in the soil.
When you place the rhizome in the planting hole, look for the side with the most prominent eyes or sprouts. Position the rhizome so those eyes are pointing toward the surface of the soil. If there is a stump from the previous year’s growth, that should also face up. For more planting details, see our How Deep Should Canna Bulbs Be Planted? guide.
What If I Can't Find the Eyes?
Sometimes a rhizome is very smooth, or the eyes are tucked into a fold in the flesh. If you are unsure which side is which, do not worry. Simply lay the rhizome on its side. Nature is very clever; the plant knows which way is up based on gravity and the warmth of the sun hitting the soil.
Even if a canna is planted completely upside down, it will eventually send its shoots around the side of the rhizome and up to the surface. However, planting it with the eyes facing up saves the plant energy. This leads to faster sprouting and a more robust start to the season.
How to Position Multiple Rhizomes
If you have a large rhizome with eyes on several different sides, lay it horizontally in the hole. This allows the plant to spread out naturally. As the canna grows throughout the summer, the rhizome will expand under the soil, creating a larger clump of foliage. Positioning it flat gives the roots and shoots the best chance to develop evenly.
The Importance of Planting Depth
Getting the orientation right is the first step, but planting depth is the second "quiet winner" for garden success. If you plant a canna too deep, it may take a very long time to sprout because the soil is cooler further down. If you plant it too shallow, the heavy stalks might tip over once they reach their full height.
For most canna varieties, the ideal depth is 2 to 4 inches. This means there should be about 2 to 3 inches of soil covering the top of the rhizome. This depth provides enough weight to anchor the plant while allowing the sun to warm the soil around the growth points quickly.
Spacing for Success
Cannas are not shy plants; they need room to breathe and spread. If you are planting several together to create a tropical screen, space the rhizomes about 1 to 2 feet apart.
- Dwarf varieties: 12 inches apart.
- Standard/Tall varieties: 18 to 24 inches apart.
Giving them enough space ensures good air circulation, which keeps the foliage healthy and prevents the plants from competing for water and nutrients. If you are planning by region, our Hardiness Zone Map can help.
What to Do Next:
- Dig a hole or trench about 4 inches deep.
- Locate the "eyes" or the old stem stump on the rhizome.
- Lay the rhizome horizontally with eyes facing the sky.
- Cover with 2 to 3 inches of soil and pat down gently.
Choosing the Right Spot
While orientation and depth are vital, cannas have a few "non-negotiable" needs when it comes to their environment. Following the "right plant, right place" rule will ensure those rhizomes turn into the tall, flowering beauties you're dreaming of.
Sun and Heat
Cannas are sun-worshippers. To get the best flowers and the most vibrant leaf colors, they need at least 6 to 8 hours of direct sunlight every day. If they are planted in too much shade, they tend to become "leggy," meaning they grow tall and thin as they reach for the light, and they may not produce many flowers.
Heat is also a major factor. Canna lilies do not really start growing until the soil is warm. At Longfield Gardens, we recommend waiting until the soil temperature reaches at least 60°F before planting them outdoors. If the ground is still cold and soggy, the rhizome may sit dormant for weeks, which increases the risk of it rotting.
Soil and Drainage
"Drainage" is a word gardeners use to describe how fast water leaves the soil. Cannas love moisture, but they do not like to sit in a puddle. The best soil for cannas is rich, loose, and holds some moisture without becoming a swamp.
If your soil is very heavy clay, you can improve it by adding some compost or aged manure. This adds nutrients and creates a "fluffier" soil structure that allows the roots to grow easily. If you are planting in containers, use a high-quality potting mix rather than garden soil to ensure proper drainage.
Starting Cannas Indoors vs. Outdoors
Because cannas love heat and have a relatively long growing season, many gardeners choose to give them a head start indoors. This is especially helpful if you live in a northern region with a short summer. For a step-by-step overview, see When to Start Canna Bulbs Indoors for Summer Success.
The Indoor Head Start
Starting cannas in pots 4 to 6 weeks before the last frost date can result in much earlier blooms.
- Choose a pot that is slightly larger than the rhizome.
- Fill it with damp potting soil.
- Plant the rhizome horizontally, 2 inches deep, with the eyes up.
- Place the pot in a warm, sunny window or under a grow light.
- Wait until the weather is consistently warm (nights above 50°F) before moving them outside.
Starting them this way allows you to see exactly which way the shoots are growing before you ever dig a hole in your garden. When it is time to transplant, you simply move the whole root ball into the ground.
Direct Planting in the Garden
If you prefer to plant directly into the landscape, wait until the danger of frost has passed and the soil is warm to the touch. This is usually around the same time you would plant tomatoes or peppers. For more timing help, read When Can I Plant Canna Bulbs? Best Timing & Planting Tips. Planting directly into the garden is the simplest method, but it requires a bit more patience as you wait for the first green tips to poke through the soil.
Watering Correctly
Once your cannas are in the ground and oriented correctly, watering becomes your main task. The rule for cannas is "deep, then let it dry a bit."
When the plants are first starting out, they do not need a lot of water. In fact, overwatering a dormant rhizome is a common mistake. Once you see green leaves appearing, you can increase the frequency. Cannas are "thirsty" plants once they are in full growth.
During the heat of mid-summer, cannas in the ground may need a deep soaking once or twice a week. If you are growing them in containers, you may need to water them every day, as pots dry out much faster than the ground. A layer of mulch around the base of the plants can help keep the soil moist and reduce the time you spend with the garden hose.
Troubleshooting Canna Growth
If your cannas aren't appearing as quickly as you expected, don't worry. They are often the last plants to "wake up" in the spring garden. Here are the most common reasons for a slow start, framed as easy fixes.
The Soil is Too Cold
This is the most common reason for slow growth. If the spring has been particularly rainy or cool, the rhizomes will simply wait for better weather. You can help by ensuring they are in the sunniest spot possible. The sun's rays will eventually warm the earth enough to trigger the eyes to sprout.
Planting Too Deep
If you accidentally buried your canna 6 or 8 inches deep, it will take much longer for the shoot to reach the surface. If you suspect this is the case, you can gently move a bit of soil away from the top to see if there is any activity. Just be careful not to snap off any tender new growth.
Lack of Moisture
While we want to avoid soggy soil, the rhizome does need some moisture to "activate." If the soil is bone-dry for weeks, the plant might stay dormant. A gentle watering every few days can encourage it to start sending out roots.
Key Takeaway: Patience is part of the process. Cannas are tropical plants that wait for true summer heat. Once they start growing, they often grow several inches in a single week.
Designing with Cannas
Now that you know how to plant them, where should they go? Because they grow so tall and have such bold textures, cannas are perfect for the back of a flower border. They create a lush, green backdrop for shorter perennials and annuals.
They also make fantastic "thrillers" in large containers. A single tall canna in the center of a pot, surrounded by trailing flowers like petunias or sweet potato vines, creates a professional-looking display. If you are using a container, remember to choose one with a heavy base; a 6-foot canna can act like a sail in a strong wind, and you don't want your hard work to tip over. For more design ideas, browse our cannas collection of articles.
At Longfield Gardens, we suggest choosing varieties that complement your existing garden colors. For a fiery look, go with red or orange blooms and bronze foliage. For something more serene, look for soft pink or yellow flowers with bright green leaves.
Essential Tools for Planting
You don't need a lot of fancy equipment to plant canna lilies. A few basic tools will make the job much easier:
- Hand Trowel: Perfect for digging small holes in loose soil or for planting in containers.
- Garden Spade: Necessary if you are digging a long trench for a "living fence" of cannas.
- Compost: A bag of high-quality compost to mix into the soil provides the nutrients these heavy-feeders need.
- Labels: Since canna rhizomes look similar, use labels to remember which variety is which until they bloom.
Moving Toward a Successful Season
Planting canna lilies is a straightforward task that offers a huge payoff. By simply identifying the eyes, laying the rhizome horizontally, and giving it a warm, sunny spot, you are setting the stage for a spectacular summer.
As you look at your garden plan, remember that gardening is meant to be an enjoyable, relaxing activity. There is no need to stress over the exact angle of the rhizome or the precise inch of depth. Cannas are resilient and want to grow. Your job is simply to give them the basics—sun, drainage, and a little bit of space—and then step back and watch the magic happen.
Final Tips for Success:
- Wait for warm soil (at least 60°F).
- Plant horizontally with eyes facing up.
- Ensure 6+ hours of direct sun.
- Water deeply once the leaves appear.
Conclusion
Canna lilies are truly the "easy win" of the summer garden. Their bold presence and tropical flair bring a sense of wonder and beauty to any yard. We at Longfield Gardens are proud to provide high-quality rhizomes that help you achieve these stunning results with minimal effort. By following these simple steps for orientation and care, you are well on your way to a season of lush foliage and bright, beautiful blooms.
- Identify the eyes or stem stumps on your rhizome.
- Plant horizontally 2 to 4 inches deep.
- Choose a sunny, well-draining location.
- Enjoy the fast-paced growth once the summer heat arrives.
Ready to start your tropical oasis? The best time to plan is now. Head over to our selection and choose the colors and heights that will make your garden shine this year.
"The beauty of canna lilies lies in their resilience and their ability to transform a standard backyard into a tropical paradise in just one season."
FAQ
What happens if I plant my canna lily rhizome upside down?
If a canna rhizome is planted upside down, it will still grow, but it will take longer to emerge. The plant's shoots are programmed to grow toward the warmth and light, so they will eventually grow around the side of the rhizome and reach the surface.
Do I need to soak canna rhizomes before planting?
Soaking is not strictly necessary, but it can help "wake up" a very dry rhizome. If your rhizomes feel particularly hard or shriveled, you can soak them in lukewarm water for 2 to 4 hours before planting to jumpstart the hydration process.
How many eyes should a canna rhizome have?
A healthy rhizome usually has between 1 and 5 eyes. More eyes generally mean more stems will grow from that single planting spot, resulting in a fuller, bushier plant. Even a small piece of rhizome with just one healthy eye is enough to produce a beautiful plant.
Can I leave canna lilies in the ground over winter?
In USDA zones 8 to 11, cannas can usually stay in the ground year-round with a layer of mulch for protection. In colder zones (zones 7 and below), the rhizomes should be dug up after the first frost, stored in a cool, dry place, and replanted the following spring.
