Table of Contents
- Introduction
- Understanding the Canna Rhizome
- How to Identify the Eyes of a Canna Bulb
- Texture and Firmness: Signs of a Healthy Bulb
- Size and Shape Variations
- Comparing Cannas to Other Garden Bulbs
- What to Do When Your Bulbs Arrive
- Which Way is Up? Planting Based on Appearance
- Identifying Sprouted Canna Bulbs
- What Canna Bulbs Look Like When Digging Them Up
- Recognizing Problems: What a "Bad" Bulb Looks Like
- The Role of Peat Moss in Appearance
- Sizing Grading: 2/3 vs. 3/5 Eyes
- Does the Foliage Color Affect the Bulb Appearance?
- Preparing the Soil Based on Bulb Shape
- Using a Bulb Auger vs. a Trowel
- Summary of Visual Identification
- FAQ
- Conclusion
Introduction
Choosing canna lilies for your garden is an exciting way to bring a bold, tropical feel to your landscape. These canna lilies are beloved for their massive, colorful leaves and showy blossoms that last from midsummer until the first frost. When your order from Longfield Gardens arrives, the first thing you will notice is that canna "bulbs" look a bit different than the round tulips or daffodils you might be used to.
Knowing exactly what to look for when you handle these unique plants helps you plant them with confidence. This guide is for any gardener who wants to understand the anatomy of a canna rhizome, identify a healthy specimen, and ensure they are tucked into the soil correctly. By the end of this article, you will be an expert at identifying and preparing your canna bulbs for a successful growing season. For a broader overview, see All About Cannas.
Understanding the physical characteristics of cannas is the first step toward a garden full of vibrant, humming-bird-attracting blooms.
Understanding the Canna Rhizome
While most people call them "bulbs," cannas actually grow from a structure called a rhizome. In the gardening world, we use the term "bulb" as a catch-all for any plant that stores its energy in an underground structure. However, a rhizome has its own unique look and growth habit that sets it apart.
A canna rhizome is a thick, horizontal stem that grows underground. It acts as a storage tank for the plant, holding all the energy and nutrients needed to send up those tall, leafy stalks in the summer. If you have ever handled fresh ginger root from the grocery store, you already have a good idea of what a canna rhizome feels like. It is firm, chunky, and grows in a somewhat irregular, branching shape.
The surface of the rhizome is usually covered in thin, papery scales. These are actually modified leaves that protect the "eyes" or growth points of the plant. Underneath these scales, the skin of the rhizome is typically tan, beige, or light brown. In some varieties, you might even see hints of pink or purple near the tips where new growth is beginning to emerge.
How to Identify the Eyes of a Canna Bulb
The most important feature to look for on a canna rhizome is the "eye." Much like a potato, the eyes of a canna bulb are the spots where the new stems will sprout. When you are looking at your rhizomes, these eyes appear as small, rounded bumps or pointed tips along the surface. For more identifying tips, see How to Tell if Canna Bulbs are Good.
In many cases, the eyes are a slightly different color than the rest of the rhizome. They may look creamy white, light green, or even a soft pink. These points are the future of your plant, so you want to handle them with care to avoid snapping them off.
At Longfield Gardens, we grade our cannas based on the number of eyes they have. A "2/3 eye" rhizome will have two to three visible growth points, while a "3/5 eye" rhizome is larger and has more potential sprout locations. Generally, the more eyes a rhizome has, the faster it will fill out and the more impressive the initial display of foliage will be.
Key Takeaway: The "eyes" are the most critical part of the canna bulb. Look for firm, slightly raised bumps or tips that indicate where the plant is ready to grow.
Texture and Firmness: Signs of a Healthy Bulb
When you hold a canna bulb in your hand, it should feel heavy for its size. A healthy rhizome is firm to the touch, similar to a fresh carrot or a firm potato. It should not feel squishy, hollow, or light. If a rhizome feels very light, it may have dried out too much during storage. If it feels soft, it may have been exposed to too much moisture.
The outer skin might be slightly wrinkled, which is normal for a plant in its dormant state. However, the core of the rhizome should remain solid. You may also see some dried, stringy bits hanging off the rhizome. These are simply the old roots from the previous growing season. They don't need to be removed, but they also won't grow again. The plant will develop brand-new roots once it is tucked into warm, moist soil.
Sometimes, you might see a small amount of blue or gray surface dust on the rhizome. This is often just a harmless storage mold or a remnant of the peat moss used for shipping. As long as the rhizome is firm and the eyes are intact, the plant is healthy and ready to go into the ground.
Size and Shape Variations
Not all canna bulbs look identical. The size and shape can vary significantly depending on the specific variety and how the rhizome was harvested. Some varieties naturally produce long, slender rhizomes, while others produce chunky, rounder clumps. For a medium-height example, see Canna Medium City of Portland.
Standard canna varieties, which can grow up to six or eight feet tall, often have larger, more robust rhizomes. Dwarf varieties, like the 'City of Portland' or 'Yellow Futurity', may have slightly smaller rhizomes, but they are just as packed with energy.
You might also notice that some rhizomes are branched, looking like two or three pieces joined together. This is a sign of a very healthy, mature plant that has been dividing itself. You can plant these large clumps as they are, or if they have plenty of eyes, you can gently pull them apart to create more plants for your garden.
Comparing Cannas to Other Garden Bulbs
To get a better visual sense of what a canna bulb looks like, it helps to compare it to other common garden items. For even taller options, browse Tall Cannas.
- Compared to a Tulip: A tulip is a "true bulb" with a distinct teardrop shape and a flat bottom. A canna is a horizontal, lumpy rhizome with no clear "top" or "bottom" in the traditional sense.
- Compared to a Dahlia: Dahlia tubers look like a bunch of carrots or sweet potatoes joined at a central neck. Canna rhizomes are more like a single, continuous, segmented log.
- Compared to Ginger: This is the closest comparison. If you laid a piece of ginger root and a canna rhizome side by side, they would look like cousins. Both have that segmented, horizontal growth pattern and firm, tan skin.
What to Do When Your Bulbs Arrive
When your package from us arrives, it is a good idea to open it immediately. For shipping timing details, see Shipping Information.
Your canna rhizomes will likely be tucked into a breathable bag with some peat moss to keep them at the right moisture level.
- Inspect the rhizomes: Give them a gentle squeeze to ensure they are firm.
- Count the eyes: Locate the growth points so you know which way to plant them.
- Check the moisture: The rhizomes should feel slightly cool and dry, not soaking wet or bone-dry.
- Keep them cool: If you aren't ready to plant yet because the soil is still cold, keep them in a cool, dark, dry place like a basement or garage (around 45–50°F).
What to Do Next:
- Identify the eyes on each rhizome.
- Confirm the rhizomes are firm and healthy.
- Store in a cool, dark place until your local soil temperature reaches at least 65°F.
Which Way is Up? Planting Based on Appearance
Because canna bulbs are horizontal rhizomes, gardeners often wonder which way to plant them. The good news is that cannas are very forgiving. However, for the fastest growth, you want to pay attention to those eyes you identified earlier. For a full step-by-step, see How to Plant Canna Lily Bulbs.
The ideal way to plant a canna rhizome is horizontally. Think of it like laying a log on its side. If you see clear growth points or "eyes," try to position the rhizome so those eyes are facing toward the sky. If you see old, dried roots, those should face downward.
If your rhizome doesn't have a clear top or bottom, don't worry. Simply lay it flat in the planting hole. The plant is smart enough to know which way is up. The new shoots will naturally grow toward the light and warmth of the sun, while the roots will grow downward into the soil to find water.
Identifying Sprouted Canna Bulbs
In some cases, your canna bulbs might arrive with small, green, or white sprouts already beginning to grow. This is perfectly normal and actually gives you a "jump start" on the season. These sprouts are simply the eyes that have decided it is time to wake up.
A sprouted canna bulb looks like a regular rhizome but with a "pioneer" shoot extending an inch or two. Handle these sprouts very carefully, as they are brittle. If a sprout does happen to snap off, the rhizome will usually just send up a new one from a secondary eye, though it might take a little longer.
When planting a sprouted bulb, ensure the sprout is pointing upward. If the sprout is already quite long, you can leave the very tip of it just barely peeking out of the soil, while the rest of the rhizome is buried at the recommended depth of two to three inches.
What Canna Bulbs Look Like When Digging Them Up
If you live in a cooler climate (Zones 3–7), you will likely dig up your canna bulbs in the fall to store them for winter. Check the Hardiness Zone Map.
During the summer, the single rhizome you planted will have multiplied. What started as one small piece will often become a large, heavy clump of interconnected rhizomes. This clump will be covered in soil and a dense network of white, fleshy roots.
Once you wash away the soil and cut back the foliage, you will see a "colony" of rhizomes. Each of these new segments will have its own set of eyes. This is the perfect time to see how the plant grows horizontally, expanding outward to create a larger footprint in the garden.
Recognizing Problems: What a "Bad" Bulb Looks Like
While we stand behind the quality of our plants with our 100% Quality Guarantee, it is helpful to know what a healthy canna bulb should not look like. Being able to spot a problem early helps you manage your garden better.
- Soft or Mushy Spots: If a rhizome feels like a soft sponge or oozes liquid when squeezed, it has likely succumbed to rot. This usually happens if the bulb was kept too wet in cold conditions.
- Excessive Shrivelling: While a few wrinkles are normal, a rhizome that is paper-thin, very light, and brittle throughout has likely dried out completely.
- Heavy Mold Growth: A small amount of surface fuzz is usually fine, but if the entire rhizome is covered in thick, black, or colorful mold and the flesh underneath is soft, the bulb may no longer be viable.
If you encounter any of these issues with a new shipment, it is best to contact us promptly so we can help you with a replacement or a solution.
The Role of Peat Moss in Appearance
When you open your package from Longfield Gardens, your canna bulbs might be covered in a brown, crumbly material. This is peat moss. We use it because it is excellent at regulating moisture and protecting the rhizomes during their journey from our facility in New Jersey to your home.
The peat moss might make the bulbs look "dirty" or dusty, but this is actually a sign of professional handling. It keeps the rhizomes from rubbing against each other and prevents them from drying out too quickly. You don't need to wash the peat moss off before planting; in fact, you can sprinkle it into the planting hole to help improve the soil texture around the rhizome.
Sizing Grading: 2/3 vs. 3/5 Eyes
When shopping for cannas, you will often see different "grades" or sizes listed. This can affect the physical appearance of the bulb you receive. For a medium-height option, see Canna Medium The President.
A 2/3 eye rhizome is the standard size for most home gardens. It is usually about three to five inches long and has at least two strong growth points. These are reliable and will grow into beautiful plants within a single season.
A 3/5 eye rhizome is a larger, "jumbo" grade. These rhizomes are physically bigger and heavier because they have more energy stored up. With more eyes, you get more initial stems, which leads to a bushier plant much faster. If you are planting in a large container and want an instant impact, the 3/5 eye size is a fantastic choice.
Does the Foliage Color Affect the Bulb Appearance?
A common question is whether you can tell the color of the flowers or leaves just by looking at the bulb. For the most part, the answer is no. Most canna rhizomes look very similar regardless of whether the plant will have green leaves or burgundy ones.
However, there are subtle clues in some varieties. Varieties with very dark foliage, like 'Black Knight', may sometimes have a slightly darker, purplish tint to the skin of the rhizome or the tips of the eyes. Varieties with variegated leaves, like 'Stuttgart', don't usually show their stripes on the bulb itself. For a striped foliage example, see Canna Tall Stuttgart.
Because it is hard to tell them apart once they are out of the bag, we recommend keeping your varieties labeled if you are planting several different types. This ensures you get the right heights and colors in the spots you have planned for them.
Preparing the Soil Based on Bulb Shape
The horizontal shape of the canna bulb tells you exactly how to prepare the planting site. Because they grow wide rather than deep, you don't need a very deep hole, but you do need a wide one. For planting-depth details, see How Deep to Plant Canna Lily Bulbs in the Ground.
A hole that is about four inches deep and twice the width of the rhizome is perfect. This gives the roots plenty of room to spread out and anchor the tall stalks that will eventually emerge. If your soil is heavy clay, adding a bit of compost or peat moss to the bottom of the hole will help the rhizome feel "at home" and prevent water from sitting directly against the skin of the bulb.
Remember, cannas love heat. If you plant your bulbs in soil that is too cold (below 60°F), they will simply sit there and wait. They won't start looking like a growing plant until the ground feels like summer.
Using a Bulb Auger vs. a Trowel
Because canna bulbs are chunky and horizontal, a standard narrow bulb planter (the kind used for tulips) often won't work. Those tools create a vertical, narrow hole that doesn't fit the shape of a rhizome.
Instead, a garden trowel or a wide bulb auger is a better choice. You want to create a flat-bottomed trench or a wide circular hole so the rhizome can lay flat. If you try to force a canna bulb into a narrow hole vertically, you risk snapping the eyes or planting it too deep, which can delay blooming.
Key Takeaway: Always prioritize width over depth when planting canna rhizomes. A wide, shallow hole accommodates their horizontal growth habit perfectly.
Summary of Visual Identification
To recap, here is what a high-quality canna bulb should look like when you are ready to plant:
- Shape: Horizontal, chunky, and segmented (like ginger).
- Eyes: 2 to 5 firm, raised bumps or tips (white, green, or pinkish).
- Texture: Firm to the touch, not squishy or hollow.
- Skin: Tan or light brown, sometimes with papery scales.
- Roots: Some dried, stringy bits are normal; new roots will be white and fleshy.
FAQ
Which way is up on a canna bulb?
Canna bulbs should be planted horizontally (flat) in the soil. If you can see the "eyes" or growth points, point them toward the sky. If you see old, dried roots, those should face downward. If you can't tell, just lay it flat; the plant will find its way up.
How many eyes should a canna bulb have?
A standard healthy canna rhizome typically has 2 to 5 eyes. At Longfield Gardens, we offer both 2/3 eye and 3/5 eye grades. More eyes generally result in a bushier plant with more stems in the first year.
What color should a healthy canna rhizome be?
The skin is usually a light tan or beige color, often covered in thin, papery brown scales. The growth points (eyes) may be creamy white, light green, or have a pinkish-purple tint. The interior flesh, if visible, should be a healthy white or cream color.
Can you plant a canna bulb that has already sprouted?
Yes, you can certainly plant a sprouted bulb. In fact, it gives the plant a head start! Just be very careful not to snap the brittle sprout when handling the rhizome. Plant it with the sprout pointing up, and keep the tip of the sprout near the soil surface.
Conclusion
Identifying and handling canna bulbs is a straightforward process once you know what to look for. By recognizing the horizontal shape of the rhizome and the importance of the growth eyes, you can set your garden up for a spectacular summer display. These plants are resilient, easy to grow, and offer some of the best "bang for your buck" in terms of size and color.
- Look for firm, chunky rhizomes that feel heavy for their size.
- Ensure there are at least 2–3 visible eyes on each piece.
- Plant them flat in warm soil once the danger of frost has passed.
- Keep them well-watered once they begin to sprout.
We are here to help you succeed in the garden. Whether you are planting Canna Tall Tropicanna for its striped leaves or 'The President' for its classic red blooms, starting with high-quality rhizomes is the key.
"The secret to a tropical-looking garden is getting the basics right from the start. A firm rhizome planted in warm soil is all it takes to begin your summer paradise."
We invite you to explore our selection of premium canna lilies at Longfield Gardens and start planning your most beautiful garden yet. With our 100% quality guarantee, you can plant with peace of mind, knowing your garden is off to a great start.