Table of Contents
- Introduction
- The Short Answer: Are Canna Lily Bulbs Edible?
- The History of the Edible Canna
- Understanding the Canna Plant: Bulbs vs. Rhizomes
- Ornamental vs. Edible Varieties
- The Culinary Profile: What Do They Taste Like?
- How to Harvest and Store Canna Rhizomes
- Preparing and Cooking Canna Bulbs
- Other Edible Parts of the Canna Plant
- Safety First: Avoiding Lookalike Confusion
- Growing Your Own Cannas for the Kitchen
- Conclusion
- FAQ
Introduction
Gardening is a hobby that offers endless rewards, from the visual thrill of a vibrant tropical bloom to the satisfaction of growing your own food. While most gardeners choose cannas for their bold, banana-like leaves and brilliant flowers, these plants have a long and fascinating history as a food crop. At Longfield Gardens, we enjoy helping you discover the many ways that garden plants can bring value to your landscape, whether through beauty or utility.
If you have ever looked at the thick, sturdy roots of your ornamental cannas while digging them up for the winter, you may have wondered if they are useful for more than just next year's display. This article will explore the culinary side of these tropical favorites, focusing on which varieties are traditionally eaten and how they are prepared. Whether you are an adventurous home cook or a curious gardener, understanding the edible nature of cannas adds a new layer of appreciation for these hardy plants.
While many "lilies" in the garden are strictly ornamental or even toxic, cannas are a unique exception. This guide will help you distinguish between the different types of cannas and provide clear advice on their safety and use. We want to ensure you have the right information to enjoy your garden safely and successfully.
The Short Answer: Are Canna Lily Bulbs Edible?
The simple answer is yes, canna lily bulbs are edible. To be botanically accurate, these "bulbs" are actually rhizomes, which are thick underground stems that store energy for the plant. Specifically, the species Canna indica, often called "Achira" in South America or "Queensland Arrowroot" in Australia, has been grown as a primary food source for thousands of years.
While the rhizomes of the garden hybrids you might find in a typical flower bed are also technically non-toxic, they are generally not grown for food. These garden hybrids have been bred for the size and color of their flowers rather than the quality of their roots. Because of this, the roots of ornamental types can be quite fibrous, woody, and less flavorful than those of the agricultural varieties.
It is also important to note that while the plant itself is safe, you must always consider how the plant was grown. If you have used systemic pesticides or chemical fungicides on your garden cannas, they are not safe to eat. Always ensure that any plant you intend to consume has been grown using food-safe methods.
The History of the Edible Canna
The story of the edible canna begins in the Andean mountains of South America. Archeological evidence suggests that people in Peru and Ecuador were cultivating Canna indica as far back as 4,000 years ago. It was a staple crop for the Moche and Inca civilizations, valued for its ability to grow in a variety of climates and provide a steady source of starch.
As global trade expanded, the canna plant traveled far beyond its South American home. It became an important crop in Southeast Asia, particularly in Vietnam and southern China, where the starch is still used to make high-quality transparent noodles. In the 19th century, it was introduced to Australia, where it earned the name "Queensland Arrowroot."
Throughout history, the canna has been a "survival crop" because it is resilient and easy to grow. It doesn't require the complex processing that some other tropical starches do, and it can stay in the ground until it is needed. This long history of consumption proves that the plant is not just a pretty face in the garden but a reliable source of nutrition.
Understanding the Canna Plant: Bulbs vs. Rhizomes
In the gardening world, we often use the word "bulb" as a catch-all term for any plant that grows from a fleshy underground part. However, cannas grow from rhizomes. A rhizome is a horizontal underground stem that sends out roots and shoots from its nodes.
If you look closely at a canna "bulb," you will see "eyes" or buds. Each of these eyes has the potential to grow into a new stalk. When we talk about eating cannas, we are talking about these starchy, energy-rich rhizomes.
The structure of the rhizome is what makes it a good food source. It is packed with starch granules that the plant uses to survive dormant periods. For the cook, this means the rhizome has a texture similar to a potato or a Jerusalem artichoke. Understanding this structure helps you know what to look for when harvesting; the younger, outer parts of the rhizome are usually the most tender and best for eating.
Ornamental vs. Edible Varieties
If you are interested in edible landscaping, it is helpful to know the difference between the cannas bred for beauty and those bred for the kitchen. While all Canna species are considered non-toxic, they are not all created equal in terms of taste and texture.
Edible Canna (Canna indica)
This is the "original" edible variety. It often has smaller, more subtle red flowers and large, plain green leaves. Its primary value is underground. The rhizomes of Canna indica are smoother, less fibrous, and produce a high yield of high-quality starch. If your goal is to harvest for food, this is the species to look for.
Ornamental Hybrids
The cannas we usually ship from Longfield Gardens are ornamental hybrids. These have been selected for their spectacular flower colors—like bright oranges, yellows, and pinks—and their dramatic foliage, which can be purple, bronze, or variegated. While you can technically eat these, the rhizomes are often smaller and more "stringy." They are best left in the ground to provide beauty for your backyard.
Key Takeaway: If you want to grow cannas specifically for eating, seek out Canna indica (Achira). For a beautiful summer display, stick with ornamental hybrids, which are safe to handle but less pleasant to eat.
The Culinary Profile: What Do They Taste Like?
When people first try canna rhizomes, they are often surprised by the flavor. They do not taste like typical lilies or flowers. Instead, they have a very mild, slightly sweet, and earthy flavor.
- Raw Texture: When eaten raw, young canna rhizomes are crisp and crunchy, much like a water chestnut or a jicama. They can be sliced thin and added to salads for an interesting texture.
- Cooked Texture: When boiled or baked, the starch in the rhizome softens. It becomes somewhat translucent and takes on a texture that is a cross between a potato and a very firm piece of squash.
- Flavor Profile: The taste is very subtle, which makes it an excellent "blank canvas" for other flavors. It easily absorbs the spices or sauces of the dish it is cooked in.
Because canna starch is very easy to digest, it was historically used as a food for children and the elderly. The starch granules are among the largest found in the plant kingdom, which gives the cooked root a unique "mouthfeel" that is different from cornstarch or potato starch.
How to Harvest and Store Canna Rhizomes
If you decide to harvest your cannas for food, timing and technique are important. You want to harvest at a time when the plant has stored the maximum amount of energy in its roots.
When to Harvest
The best time to harvest canna rhizomes is in the late autumn, just after the first light frost has blackened the leaves. This signals that the plant has finished its growing season and all its nutrients are tucked away in the rhizomes. In warmer climates where frost doesn't occur, you can harvest when the plant reaches maturity and the flowering begins to slow down.
The Harvesting Process
- Cut the Stalks: Use clean garden shears to cut the stalks down to about three or four inches above the soil level.
- Dig Carefully: Use a garden fork rather than a shovel to avoid slicing through the rhizomes. Start digging about a foot away from the base of the plant to loosen the soil.
- Lift the Clump: Gently lift the entire root mass out of the ground.
- Clean the Roots: Shake off the loose soil and rinse the rhizomes thoroughly with a hose.
Selection and Storage
For eating, select the "new" growth. These are the plump, lighter-colored sections at the outer edges of the clump. The older, central part of the root system can be tough and is better saved for replanting next year.
If you aren't eating them right away, store them in a cool, dark, and humid place. Unlike potatoes, canna rhizomes can dry out quickly. Keeping them in a container of damp sand or peat moss can help maintain their freshness for a few weeks, and winter storage tips can help if you want to store them longer.
Preparing and Cooking Canna Bulbs
Preparing cannas for the kitchen is a straightforward process. Because the skin can be a bit tough and dirty, the first step is always a thorough cleaning and peeling.
Preparation Steps
- Peeling: Use a standard vegetable peeler to remove the outer skin. You will find a white or slightly cream-colored interior.
- Slicing: Slice the rhizome into rounds or cubes, depending on how you plan to cook it.
- Soaking: Some people like to soak the sliced pieces in cold water for a few minutes to remove any excess surface starch.
Cooking Methods
- Roasting: Toss cubes of canna rhizome with olive oil, salt, and herbs. Roast them at 400°F until they are tender and slightly browned on the outside.
- Boiling: Boil the slices in salted water for 15 to 20 minutes. Once soft, they can be mashed just like potatoes. Adding butter and garlic helps enhance their mild flavor.
- Frying: Thin slices can be fried in oil to make "canna chips." These are a fun, crunchy snack that works well with a bit of sea salt.
- Starch Extraction: In many cultures, the roots are grated and soaked in water to extract the starch. The liquid is strained, and the starch is allowed to settle at the bottom. Once dried, this "arrowroot" powder is used as a thickener for soups and sauces or to make noodles.
What to Do Next:
- Choose a few young rhizomes from your next autumn harvest.
- Clean and peel them thoroughly to reveal the white flesh.
- Try roasting them alongside other root vegetables like carrots or sweet potatoes.
- Note the texture and flavor to see how they fit into your favorite recipes.
Other Edible Parts of the Canna Plant
While the rhizomes are the most common part of the plant to be eaten, other parts of the canna are also used in various culinary traditions around the world.
Young Shoots
The very young, tender shoots that emerge from the rhizome in the spring can be eaten as a vegetable. They are often compared to asparagus or bamboo shoots. They should be harvested when they are only a few inches tall and still tightly furled. These can be blanched or stir-fried.
Leaves
Canna leaves are not typically eaten directly because they are very fibrous. However, they are widely used as food wraps. Similar to banana leaves or corn husks, canna leaves are perfect for wrapping fish, tamales, or rice before steaming or grilling. They impart a very subtle, tea-like aroma to the food and help keep it moist during the cooking process.
Seeds
The seeds of the canna lily are incredibly hard and are often used as beads for jewelry or as the "shot" inside traditional rattles. While some cultures have used them as a substitute for coffee or ground them into a meal in times of extreme scarcity, they are generally not considered a primary food source and are difficult to process.
Safety First: Avoiding Lookalike Confusion
When discussing the edibility of any garden plant, safety is the most important factor. The name "lily" is used for many different plants, and some of them are highly toxic. It is vital that you correctly identify your plants before ever considering them for the kitchen.
The Calla Lily Danger
One of the most common mistakes is confusing Canna lilies with Calla lilies. While the names sound similar, they are very different plants. Calla lilies contain calcium oxalate crystals, which are toxic. If eaten, they cause intense burning and swelling of the mouth and throat. Always look at the leaves and flowers; cannas have large, paddle-shaped leaves and asymmetrical flowers, while callas have heart- or arrow-shaped leaves and a single, elegant spade-shaped bloom.
True Lilies and Lily of the Valley
True lilies (genus Lilium) and Lily of the Valley (Convallaria majalis) are also very common in gardens. Many of these are toxic to humans and even more dangerous for pets. None of these look particularly like a canna, but the shared use of the word "lily" can lead to dangerous assumptions.
Pesticide and Chemical Use
As mentioned earlier, never eat any plant from your garden if you have treated it with non-food-safe chemicals. This includes many common flower fertilizers, systemic bug sprays, and fungicides used to prevent rot during winter storage. If you plan to eat your cannas, treat them like you would your tomatoes or lettuce—use only organic, food-safe products.
Growing Your Own Cannas for the Kitchen
If you want to try growing cannas for food, the good news is that they are incredibly easy to cultivate. They are vigorous growers that rarely suffer from pests or diseases. Following a few simple gardening rules will ensure you get a great harvest of both flowers and roots, and All About Cannas goes even deeper.
Right Plant, Right Place
Cannas are tropical plants. They love the sun and they love the heat. For the best root production, plant your cannas in a spot that receives at least 6 to 8 hours of direct sunlight. They also prefer "rich" soil that is high in organic matter. Adding a layer of compost to your planting bed before you start will give the rhizomes the nutrients they need to grow large and fleshy. If you want to check your climate first, the Hardiness Zone Map is a useful reference.
Water and Fertilizer
Cannas are often called "thirsty" plants. They thrive in moist soil and can even be grown at the edge of a pond. Regular watering is key, especially during the heat of the summer. If the soil stays too dry, the rhizomes will be small and tough.
Because they grow so fast, they are also heavy feeders. A fertilizer that is balanced or slightly high in nitrogen will encourage the plant to put on lots of green growth, which in turn feeds the development of the rhizomes underground. For more inspiration on using cannas in the landscape, Fresh Ideas for Growing Cannas is a helpful read.
Spacing and Depth
When planting, place the rhizomes about 2 to 4 inches deep. Space them at least 18 to 24 inches apart. This gives the underground stems plenty of room to spread out and multiply without becoming overcrowded. By the end of the season, a single rhizome can turn into a large clump, providing you with plenty of options for both replanting and eating.
Conclusion
The canna lily is much more than a beautiful tropical accent for your summer garden. It is a plant with a rich cultural history and a practical, edible side that many modern gardeners are just beginning to rediscover. Whether you are interested in the starchy, potato-like rhizomes of Canna indica or you simply want to use the large leaves to wrap your summer grilling projects, cannas offer a unique way to bridge the gap between the flower garden and the kitchen.
At Longfield Gardens, we believe that understanding the plants in your yard makes the experience of gardening even more fulfilling. While most of us will continue to grow cannas for their spectacular flowers and lush foliage, knowing that they are safe and edible provides a wonderful sense of connection to the long history of this Andean treasure.
Final Takeaway:
- Canna rhizomes are safe to eat and have a mild, starchy flavor.
- Canna indica is the variety most commonly used for food.
- Always ensure your plants are grown without harmful chemicals before consuming them.
- Correct identification is key to avoid confusion with toxic "lookalikes" like Calla lilies.
As you plan your next garden, consider the versatile canna. Whether you're planting for the visual drama or a bit of culinary experimentation, these plants are a rewarding and easy-to-grow addition to any landscape.
FAQ
Are all varieties of canna lilies edible?
Technically, all species in the Canna genus are non-toxic to humans. However, Canna indica is the variety traditionally grown for food because it has more palatable, less fibrous rhizomes. Ornamental hybrids found in most garden centers are safe to handle but are generally less tasty and more "woody" than agricultural varieties.
How do you prepare canna lily roots for eating?
To prepare canna rhizomes, you should first scrub them thoroughly to remove soil and then peel away the outer skin with a vegetable peeler. The white interior can then be boiled, roasted, or fried, similar to how you would prepare a potato or a sweet potato. They can also be sliced thin and eaten raw for a crunchy texture like jicama.
Are canna lily leaves safe to use for cooking?
Yes, canna lily leaves are safe and are frequently used as food wraps in many cultures. While the leaves themselves are too fibrous to be eaten directly, they are excellent for wrapping meat, fish, or rice dishes before steaming or baking. They help retain moisture and add a very mild, pleasant aroma to the food.
Can I eat the canna lilies I bought from a garden center?
You should only eat cannas from a garden center if you can verify they have not been treated with systemic pesticides or chemical fungicides. Many ornamental plants are treated with chemicals that are not safe for human consumption. If you want to grow cannas for food, it is best to start them yourself using organic methods or purchase varieties specifically labeled for culinary use.