Canna Lily Bulbs Which Way Up: A Simple Planting Guide

Table of Contents

1. Introduction
2. Understanding the Canna Rhizome
3. Which Way Up? The Simple Answer
4. Step-by-Step Planting Guide
5. Starting Cannas Indoors for a Head Start
6. Caring for Your Cannas After Sprouting
7. Common Questions About Canna Orientation
8. Creating a Tropical Display
9. Moving Toward the End of the Season
10. Conclusion
11. FAQ

Introduction

Adding a splash of the tropics to your backyard is an exciting milestone in the gardening season. Canna lilies are the perfect choice for this transformation, offering lush, banana-like leaves and vibrant flowers that demand attention. At Longfield Gardens, we love how these statuesque plants can turn a standard flower bed into a vacation-like retreat with very little effort.

If you are holding a canna rhizome for the first time, you might notice it looks a bit different from a typical round tulip or daffodil bulb. Its unique, chunky shape often leaves gardeners asking exactly how to position it in the soil. Getting the orientation right is a great way to ensure your plants emerge quickly and grow strong from day one.

This guide will help you identify the top from the bottom of your canna lily bulbs and walk you through the simple steps for successful planting. Whether you are starting them in pots for an early head start or planting them directly into your summer garden, our Spring-Planted Summer-Blooming Bulbs selection has you covered. Understanding which way is up will give you the confidence to grow these tropical beauties like a pro.

Understanding the Canna Rhizome

Before we dig into the planting process, it helps to know exactly what you are holding. While most people call them "bulbs," cannas actually grow from rhizomes. A rhizome is a thick, fleshy underground stem that grows horizontally just beneath the soil surface. It acts as a storage unit for the plant, holding the energy needed to produce those massive leaves and bright blooms.

If you have ever handled fresh ginger from the grocery store, you already know what a canna rhizome looks like. They are knobby, irregular, and firm to the touch. Because they are stems rather than true bulbs, they don't have the classic "pointed top and flat bottom" shape that you find with onions or lilies. This is why determining the correct orientation is a bit more of a puzzle, but it is one that is very easy to solve once you know what to look for.

Identifying the "Eyes"

The most important feature to look for on a canna rhizome is the "eye." In gardening, an eye is a small, pointed growth bud. This is where the new stems and leaves will eventually emerge. These eyes often look like small, pinkish or white bumps on the surface of the rhizome.

If your canna has already started to wake up, these eyes might have developed into short, green or reddish spears. These points are the clearest indicator of which way is up. You want these growth points to be directed toward the sky so the plant can reach the sunlight as efficiently as possible.

Finding the Roots

While the eyes tell you where the top is, the roots will tell you where the bottom is. Look for thin, hair-like fibers trailing off one side of the chunky rhizome. These are the old roots from the previous growing season.

Sometimes these roots are dried and brittle, which is completely normal. In other cases, you might see new, white roots beginning to form. These roots should be positioned facing downward into the soil so they can immediately begin drawing up moisture and nutrients.

The Stem Stump

Another helpful clue is the stem stump. Cannas are often sold as divided sections of a larger clump. You may see a flat, circular scar or a short, woody tube on the rhizome. This is the base of last year's flowering stem. This stump typically points upward or slightly to the side. While the new growth won't come out of this old stump, it serves as a reliable landmark for orienting the rest of the rhizome.

Which Way Up? The Simple Answer

The simplest rule for planting canna lilies is to lay the rhizome horizontally in the planting hole with the eyes or sprouts pointing toward the surface. Unlike a tulip bulb that stands upright on its base, a canna rhizome is designed to sit flat, much like it was resting on a table.

If you find a rhizome that has eyes on multiple sides or seems to have no clear top or bottom, do not worry. Nature is very resilient. If a canna is planted "upside down," the plant will still grow. The new shoots will naturally sense the warmth of the sun and the pull of gravity, eventually curving around the rhizome to find the surface. However, planting them with the eyes facing up saves the plant energy and leads to faster sprouting.

Planting at an Angle

In some cases, your rhizome might be shaped in a way that makes laying it perfectly flat difficult. If the eyes are clustered at one end, it is perfectly fine to plant the rhizome at a slight 45-degree angle. As long as the growth points are generally aimed upward, the canna will thrive.

What if There Are No Visible Eyes?

If your rhizome is completely smooth and you cannot find any bumps or sprouts, it may still be dormant. In this situation, simply lay the rhizome horizontally. The plant will eventually decide which side is the top. As the soil warms, the dormant buds will activate and push through the soil.

Key Takeaway To get the best results, lay canna rhizomes horizontally in the soil. Ensure any visible growth points (eyes) are facing upward and any roots are facing downward.

Step-by-Step Planting Guide

Once you have identified the right orientation, it is time to get your cannas in the ground. Following a few basic rules for depth and spacing will ensure your plants have the room and resources they need to reach their full potential.

1. Timing Your Planting

Timing is perhaps the most critical factor for canna success. Because these are tropical plants, they have no tolerance for frost. For a fuller timing guide, see When Should I Plant Canna Lily Bulbs? Best Timing Guide. We recommend waiting until the soil temperature reaches at least 60°F before planting them outdoors. A good rule of thumb is to plant cannas at the same time you would plant tomatoes or peppers.

In most regions, this means waiting until a few weeks after the last expected frost date. If you plant too early in cold, wet soil, the rhizomes may sit dormant for a long time or, in extreme cases, struggle to get started. Patience pays off with cannas; once the weather is truly warm, they grow with incredible speed.

2. Choosing the Right Spot

Cannas are sun-worshippers. To get the best flower production and the most vivid foliage colors, choose a location that receives at least six to eight hours of direct sunlight every day. While they can grow in partial shade, the plants will likely be shorter, and the flowering will be less impressive.

Spacing is also important. Cannas can become quite large, and they like to spread.

• Tall varieties: Space these 18 to 24 inches apart.
• Dwarf or medium varieties: Space these 12 to 18 inches apart. Giving them enough room ensures good air circulation, which helps keep the foliage healthy throughout the humid summer months.

3. Preparing the Soil

Cannas are not overly picky about soil types, but they do best in soil that is rich in organic matter. If your soil is heavy clay or very sandy, digging in some compost or well-rotted manure will make a world of difference.

Drainage is another important consideration. Drainage simply refers to how fast water leaves the soil after a rain. While cannas love moisture and can even handle "wet feet" better than most bulbs, they should not sit in a stagnant puddle for days. If your chosen spot stays soggy for a long time after a storm, consider planting in a raised bed or a large container.

4. Digging the Hole and Setting the Rhizome

Dig a hole or a trench that is about 4 to 6 inches deep. This depth provides enough soil coverage to keep the rhizome insulated and supported as the heavy stems grow tall.

1. Place the rhizome horizontally at the bottom of the hole.
2. Check that the eyes are pointing up.
3. Cover the rhizome with soil.
4. Gently press down on the soil to remove large air pockets, but do not pack it so hard that it becomes compacted.

5. Initial Watering

After planting, give the area a good drink of water. This settles the soil around the rhizome and "wakes up" the plant. After this initial watering, you can wait until you see the first green sprouts poking through the soil before you start a regular watering schedule. In the early stages, the rhizome has enough stored energy and moisture to get started.

What to do next:

• Check your local frost dates to ensure the soil is warm enough.
• Select a sunny spot with at least 6 hours of light.
• Amend the soil with compost to improve nutrition and drainage.
• Plant rhizomes 4–6 inches deep and 1–2 feet apart.

Starting Cannas Indoors for a Head Start

If you live in a northern climate with a short growing season, you might want to start your cannas indoors. This gives the plants a "head start" so they are already several inches tall by the time the weather is warm enough to move them outside. This method often results in earlier blooms.

Using the Right Containers

Choose a pot that is at least 8 to 10 inches wide and has plenty of drainage holes at the bottom. For more container-specific guidance, read How to Grow Summer Bulbs in Containers. Use a high-quality potting mix rather than garden soil. Potting mix is lighter, holds moisture better, and is free of weed seeds or soil-borne pests.

The Planting Process

The process for potting is nearly identical to planting in the ground:

1. Fill the pot about halfway with potting mix.
2. Lay the rhizome horizontally with the eyes facing up.
3. Cover with 3 to 4 inches of mix, leaving an inch of space at the top of the pot for watering.
4. Place the pot in a warm, sunny window or under grow lights.

Cannas started indoors need warmth to sprout. A room temperature of 70°F is ideal. If your house is cool, placing the pots on a seedling heat mat can speed up the process significantly. Once the danger of frost has passed, you can transplant the entire root ball into the garden.

Caring for Your Cannas After Sprouting

Once your cannas have emerged from the soil, they will begin to grow rapidly. These are "hungry" and "thirsty" plants, meaning they appreciate regular attention to look their best.

Watering Correctly

Our general rule for watering is to water deeply and then let the soil surface dry out slightly before watering again. During the heat of mid-summer, cannas can use a lot of water. If the leaves start to roll up like cigars, it is a sign that the plant is thirsty. In containers, you may need to water every day during a heatwave. In the ground, a deep soaking once or twice a week is usually sufficient.

Feeding Your Plants

To support that massive growth and constant flower production, cannas benefit from regular fertilizing. You can use a balanced, all-purpose fertilizer every 4 to 6 weeks throughout the growing season. Follow the instructions on the product label for the best results. Rich soil and plenty of nutrients will result in larger leaves and more frequent flower spikes.

Deadheading for More Blooms

As the flowers fade, you can remove the spent blooms. This process is called deadheading. By cutting off the old flower stalks, you encourage the plant to put its energy into producing new flowers rather than setting seeds. To deadhead a canna, simply follow the flower stalk down to where it meets the next leaf or bud and snip it off. Be careful not to cut off any emerging buds that may be hiding just below the old flower.

Common Questions About Canna Orientation

Even with a clear guide, it is natural to have a few lingering questions when you are standing in the garden with a handful of rhizomes. Here are a few common scenarios gardeners face.

What if my rhizome is broken?

Canna rhizomes are quite brittle and can sometimes snap during shipping or handling. See our Shipping Information if you have questions. If you have a piece that broke off, do not worry. As long as the broken piece has at least one "eye," it can be planted just like a full rhizome. If a piece breaks off and has no eyes, it likely will not grow, but the main section with the eyes will still be perfectly fine.

Should I soak the rhizomes before planting?

Some gardeners like to soak their rhizomes in lukewarm water for a few hours before planting to help rehydrate them. While this can jumpstart the process, it is not strictly necessary if you are planting into moist soil. If your rhizomes feel very dry or shriveled, a two-hour soak can be a helpful boost.

Can I plant them vertically?

While horizontal is the natural way for a rhizome to grow, some varieties have very long, narrow rhizomes that might seem like they should go in vertically. If you must plant vertically because of space constraints in a small pot, make sure the end with the most eyes is pointing up. However, for the health of the plant, horizontal is always the preferred method.

Creating a Tropical Display

Cannas are versatile players in the landscape. Because they come in such a wide range of heights and colors, you can use them in several different ways.

• The Backdrop: Use tall varieties at the back of a flower border to create a living screen or a dramatic wall of color.
• The Centerpiece: Plant a single large canna in the middle of a circular bed to act as a focal point.
• Container Tropicals: Use dwarf varieties in large pots on your patio or deck. Pair them with trailing plants like sweet potato vine or calibrachoa for a full, professional look.
• Water Features: Some cannas are particularly fond of water. They can be tucked into the edges of a garden pond (in containers) where their roots can stay consistently wet.

We have found that different foliage types—such as dark burgundy leaves next to bright variegated green and white leaves—creates a sophisticated look even when the plants are not in bloom.

Moving Toward the End of the Season

As autumn approaches and the first frost hits, your cannas will tell you when they are finished for the year. The cold will turn the lush green leaves to a dark brown or black. This is a natural part of the cycle.

In warmer climates (USDA zones 8-11), cannas can often stay in the ground year-round. You simply cut the dead foliage back to the ground and wait for them to return in the spring. In colder zones, you will need to dig the rhizomes up and store them in a frost-free place for the winter.

The beauty of cannas is that they multiply. One rhizome planted this spring will likely have turned into a much larger clump by autumn. This means that every year, your tropical garden can grow larger and more impressive.

Conclusion

Planting canna lilies is one of the most rewarding tasks a gardener can undertake. These plants offer a massive visual "return on investment" for very little work. By simply ensuring the rhizomes are planted horizontally with their eyes facing the sun, you set the stage for a spectacular summer display. We at Longfield Gardens are always thrilled to see how these tropical favorites transform home landscapes across the country, and our 100% Quality Guarantee is part of that commitment.

Remember that gardening is a journey of observation. Once your cannas are in the ground, watching those first pointed spears break through the soil is part of the fun. With the right orientation, warm soil, and plenty of sunlight, you will soon be enjoying a lush, colorful sanctuary right in your own backyard.

• Plant rhizomes horizontally for the most efficient growth.
• Wait for warm soil (60°F) before planting outdoors.
• Give them plenty of sun and regular water for the best blooms.

Next Step Take a walk through your garden and identify a sunny spot that needs a bold, tropical update. Check your soil temperature, and when the warmth arrives, you’ll be ready to plant your cannas with total confidence.

FAQ

Which side of a canna lily bulb faces up?

The "eyes" or growth points should face up toward the soil surface. These look like small, pointed bumps or sprouts. If you see roots or hair-like fibers, those should face downward. If you are unsure, laying the rhizome horizontally is the most reliable way to ensure success.

Can canna lilies grow if planted upside down?

Yes, cannas are very resilient and will eventually grow even if planted upside down. The new shoots will naturally grow toward the warmth of the sun, and the roots will grow toward gravity. However, planting them with the eyes facing up saves the plant energy and helps it emerge from the soil much faster.

How deep should I plant canna lily rhizomes?

Canna rhizomes should be planted about 4 to 6 inches deep. This provides enough soil to support the heavy, tall stems as they grow and keeps the rhizome insulated from fluctuating surface temperatures. In containers, a depth of 4 inches is usually sufficient.

Do I need to soak canna rhizomes before planting?

Soaking is not strictly necessary, but it can be helpful if the rhizomes appear very dry or shriveled. A two-hour soak in lukewarm water can rehydrate the tissue and encourage the eyes to wake up faster. If your rhizomes are firm and plump, you can skip the soaking and simply water them well after planting.