Here’s the deal… Canna Lily Care is easy!
The canna lily plant is a flamboyant summer flowering plant with a bold look. The plant grows from thick, fleshy bulbs. Canna is a genus in the banana family called Cannaceae.
Canna flowers during summertime in various vibrant flowers in the colors of red, yellow, or orange. They go in and out of gardening style.
Cannas are native to North America and South America, ranging from Argentina to South Carolina and the Caribbean islands. However, they grow in most parts of the USA.
Canna flaccida – A small yellow-flowered wild canna species native to South Carolina and Florida. It was a principal parent of today’s modern Cannas, and through hybridizers can see the little resemblance now.
Apart from being ornamental plants in the garden, they have “other” uses as well. Canna lily seeds are hard and sturdy, brown/black when dry, and pea-sized. The hard bullet-like seeds of Canna indica earned it the name “Indian Shot.”
Tip: When growing cannas from seed, soak Canna seed in warm water or notch with a file to speed up germination.
The Canna Indica is used as a source of food as the bulbs or rhizomes contain starch called achira. In Vietnam, they use starch to make high-quality “cellophane” noodles. In Thailand, the canna lily is a traditional gift on Father’s Day.
- The Canna Plant
- How To Plant Canna Bulbs & Canna Plant Care
- Canna Lily Facts… Did You Know?
- Canna Lily Care: How To
- Growing Dwarf Cannas, A Personal Journey
- Canna Questions and Answers:
- The Boldness of Cannas In The Landscape
- Recommended Reading
The Canna Plant
Introduced to Europe in the early 1500s, canna species became popular tropical plants in the mid to late 1800s.
Canna bulbs are perennial in nature. Individual stems have a thick rootstock or central stock, which has, on average, 10 to 12 leaves spirally growing around it. The plant leaf is generally emerald green, but hybrids of dark bronze and maroon foliage colors and striping exist.
In the south, cannas are plant-em and forget-em. In cooler regions, they are grown as annuals. These plants can take plenty of heat and thrive in full sun. They require little care and continue to color your garden for years.
How To Plant Canna Bulbs & Canna Plant Care
Location – When you plant canna lily bulbs, find a location with well-drained soil and get plenty of sun. They will also thrive in moist soil with a pH level of around 6.0 to 6.5.
Soggy soil is not generally favorable for these plants.
If the soil does not drain after 5-6 hours, choose another site or layer compost in the soil with improved draining properties.
Lighting – For the greatest number of dramatic blooms and bright, dark green leaves, plant them where they get lots of sun. However, they can survive in partial shade.
Spacing – There are tall and dwarf canna varieties. When planting canna lily bulbs, plant taller varieties 2′ feet apart. Plant dwarf varieties 1′ foot apart and 4″ inches deep in the soil for enough space to grow. Sow the rhizomes with their eyes or growing points facing up.
Post planting – water plants well and enjoy the heat for a good start. Roots sprout after a few weeks. If the temperatures are cooler in your area, they will take longer.
Water – When you water canna lily, the soil should remain damp but not become soggy.
Pruning – In general, cannas do not require pruning. However, if you want to keep things clean, prune away.
Containers and Pots – When growing plants in pots or containers, fill them with high-quality well-drained soil. Any container or potting method works fine if drain holes are present.
Planting is just the same as discussed for open-air planting. Outdoor Container plants may need to be watered twice per day during hot summers. Don’t allow plants to become root bound.
Tip: Grow Canna rhizomes planted in the spring after the weather warms. They are especially useful when planted in one clump to an 18″- inch redwood tub.
Container Gardens – Canna can be mixed with any other plants to make a striking container garden. This works well as long as all the plants have the same temperature and water requirements.
The video below uses Canna Tropicanna canna lily to make an attractive container garden.
Easy Tips for Growing Plants in Containers
Canna Lily Facts… Did You Know?
- Some countries use the canna rhizome as a rich edible starch
- The green foliage and stems are used as cattle fodder
- Young canna shoots are used in salads or eaten as a vegetable. The inner core is mildly sweet and crispy.
- The seeds are sometimes ground up to make tortillas
- The seeds are used as beads in jewelry and rattles
- The seeds have been used to make a purple dye
- Canna indica small, black, hard seeds sink in water and are used as bullets, earning the common name ‘Indian shot.’
- Canna plants have been used to make light-brown paper
- In remote parts of India, cannas are fermented to make alcohol
- In Vietnam, they use starch to make high-quality “cellophane” noodles
- In Thailand, the canna lily is a traditional gift on Father’s Day
Canna Lily Care: How To
Canna Lily Care – Cannas require minimum care and are quite easy to maintain for years.
Canna lily plants like moisture. Water them well but make sure to plant the roots in well-drained soil. Soggy soil can rot roots quickly. Apply mulch to retain moisture in dry areas.
They are heavy-feeding and love compost and organic materials like manure. Slow-release canna lily fertilizer with high phosphate contents every month to help keep continuous bloom.
A liquid canna fertilizer or a balanced fertilizer during summer also keeps plants healthy and promotes healthy growth.
How to deadhead canna lilies?
Deadheading Canna lily plants is not necessary for continuous blooming. However, pruning keeps things tidy in the garden, which helps with overall garden pest control.
Dig rhizomes in Zone 7b and north cold climates during the fall. Storing canna lily bulbs and rhizomes should be a part of fall care.
Only remove leaves once they turn yellow.
Plants rest in fall and winter and get ready for the spring season.
Canna Pest and Diseases
Japanese beetles and caterpillars will feed on the foliage. Read our article on controlling caterpillars for details on dealing with them.
Bacterial infections start early when leaves are rolled up. This can lead to infected foliage and flower rot.
To avoid bacterial infections, select healthy plants and spray dormant rhizomes with a Streptomycin solution.
In mild winter areas, plants can be left outside with a shelter. However, it is better to apply mulch for no losses in winter.
Store cannas from year to year after the last frost… they are prolific enough to have lots to give away.
Over at A Way To Garden (awaytogarden.com), Margaret Roach has put together a nice slideshow and info on getting those cannas ready to fill the landscape. Check out the slideshow via A Way to Garden.
For severe winter conditions, move specimens to a warmer environment. Remove the extra foliage stems, dry the soil, remove surplus soil, and store the plants in a frost-free place.
The plants can be planted in warmer conditions and watered as required. This is called winterization and is the best winter care for canna lilies.
In winter, do not keep plants dry or saturated with water. Both conditions cause them to wither in autumn. Just enough water, organic fertilizer, and sunlight are best to keep plants healthy.
Related: How To Care For A Banana Tree
Growing Dwarf Cannas, A Personal Journey
Below Betty, Brinhart shares her personal experience growing dwarf canna rhizomes in a Popular Gardening Magazine article back in 1961.
The hybrids – they’ve improved, but you’ll find some nice little growing tips from a time when people took special care of their gardens. This was long before cable, iPads, and the internet! Enjoy
Years ago, many houses were large with spacious lawns. Tall cannas were a popular item and widely used in garden landscaping. As houses and lawns diminished in size, giant canna plants, with their large foliage and massive flower clusters, gradually disappeared from the scene.
Hybridizers have brought cannas back to our gardens by developing smaller dwarf cannas that fit into the landscape of the modern home.
New canna flower colors are brighter and more beautiful than those of the old, taller canna lily varieties. And there are many pastel tints that blend well with any background. The dark green or bronze foliage, with each plant producing several unbranched, stately stalks shooting up from a single rootstock.
These lovely new dwarf hybrids grow from 2 1/2′ to 3′ feet tall. Compact in size, they freely produce large, gladiolus-like florets on medium-sized spikes.
Uses For Dwarf Cannas
Plant several red canna lilies beside a white garden gate to add a splash of color all summer.
On either side of the borders, plant them to frame the plantings and within the borders themselves to provide accents.
Plant a few along a white garden fence as a background for low-growing annuals such as petunias, and set others out in front of evergreen plantings to add color.
I’ve also seen four cannas of the same cultivars planted in the center of a circular bed, surrounded by low-growing annuals of a lighter shade. This combination creates a striking effect on a smooth, velvety green lawn.
The popularity of dwarf cannas fuels the development of new and interesting varieties.
Most find all of the dwarf cannas easy to grow. If you have a greenhouse or a large sunny window, buy divisions around the first of March and start them in 4″ to 6″ – inch fiber pots for early bloom. Fill each pot with two-thirds full of sandy soil.
Lay the division down flat with the eyes pointing upward, then cover it with 1″ inch of soil. Keep the soil moderately moist at all times.
Fill each pot with two-thirds full of sandy soil. Lay the bulbs or rhizomes down flat with the eyes pointing upward, then cover it with 1″ inch of soil. Keep the soil moderately moist at all times.
If you prefer, or if space is limited, plant all of your divisions in one large flat, placing 3″ inches of sandy soil below them and 1″ inch above. Make certain the divisions do not touch, or rot may set in.
Cannas are tropical and subtropical plants and want warm soil temperatures. They need constant warmth to produce healthy lily growth. Keep temperatures around 70° degrees Fahrenheit night and day until sprouts develop.
When the sprouts are 3″ inches high, transplant the plants into a larger container or into a sheltered cold frame outdoors until all danger of frost is past.
If you want to increase your supply of plants, cut back the foliage to the ground. Take up the divisions and cut each into as many sections as there are shoots.
Leave as much of the fleshy division with each shoot as possible, and do not harm the small lily roots already formed.
Replant canna rhizomes individually into fiber pots and place them on a sunny window sill until all danger of frost has passed. Or transplant into a cold frame until outdoor planting time.
If you do not want to divide the plants, leave them in the flat in a south window until they can be moved outdoors.
Leave as much of the fleshy rhizome with each shoot as possible, and do not harm the small lily roots already formed.
Starting canna early indoors does provide an advantage, but it is not required. Plant unsprouted divisions in their permanent location outdoors as soon as the soil has warmed up. These will bloom by midsummer or earlier, depending upon variety.
Preparing Outdoor Beds
Prepare the outdoor beds well in advance of planting time. This allows the organic matter, lime, or commercial fertilizers time to break down from the soil bacteria and be converted into food for the plants.
Since dwarf cannas are heavy feeders with massive root systems, deep cultivation and plenty of organic matter are the secrets of success.
Spade beds to a depth of 18″ inches, then turn in a reasonable amount of aged cow manure, compost, peatmoss, or leafmold, depending upon our soil needs. Rake the beds smoothly and water them down well to settle the soil for planting.
If you do not have any organic matter on hand, you can use dehydrated cow manure with a 5-10-10 commercial fertilizer. Use this mixture only in the holes where the divisions, or plants, are placed.
After all, plants sprout and top-dress the entire bed with this same mixture to help produce robust plants with plenty of bloom.
If you have established shoots growing in the house or in containers outdoors in the cold frame, harden them off by gradually placing them in the open by day and bringing them in again on cool nights.
A Canna Lily Grower Tip
In most areas, the first week in June is a good time for transplanting canna shoots into their permanent locations.
Place two handfuls of fertilizer in each hole and mix it well with the soil. If using fiber pots, place the pot and all into the hole. When transplanting the divisions from the cold frame, take a ball of earth with each one and water well after planting.
Set unsprouted divisions 2″ inches deep, 12″ to 24″ inches apart, depending upon the effect you wish to achieve.
Cannas are fast growers and need a great deal of water. Dry soil will retard growth and deform the flower spikes. Water well at least twice a week during hot, dry weather.
To help conserve moisture and to keep the soil in good tilt, mulch cannas with at least 6″ inches of green grass clippings after the shoots have reached a foot in height.
To help conserve moisture and to keep the soil in good tilt, mulch cannas with at least 6″ inches of green grass clippings after the shoots have reached a foot in height.
During the last week in July, just as the plants set their buds, mix up a liquid plant fertilizer made by stirring a one-half cup of dehydrated cow manure into a gallon of warm water, using a quart per plant.
If you prefer, you can give another top dressing with a 5-10-10 commercial fertilizer instead of liquid fertilizer. When using a dry fertilizer, water it in immediately with a fine hose spray.
Watch out for Japanese beetles bothering your cannas. Pick them off by hand. If any other insects should infest your plants, use an insecticide according to the manufacturer’s directions. It is important to spray regularly, as recommended, until they all disappear.
Another pest to watch out for is the canna leaf roller. The first measure to control the larvae that feed inside the rolled leaves is to consider Bacillus thuringiensis. Learn more about BT here and more about the canna leaf roller here.
Bacillus Thuringiensis Bt is a safe, effective, all-natural pesticide for controlling Caterpillar problems.
When frost finally blackens the canna foliage, cut off the stalks, take up the rootstocks, and, after drying them off, store them in a dry, cool place until spring.
Related: Heliconia Plant Care and Maintenance
Canna Questions and Answers:
How Long Does A Canna Root Have To Rest?
Question: How long does a canna root have to rest? I would like to start them in pots in the house before setting them out later.
Answer: Start canna roots in March indoors, and by May 1, you will have nice heavy plants ready to set outdoors. There is no advantage in starting cantles earlier than the middle of March for the plants would become too. large to handle in pots.
To start the new plants, cut each eye from the clumps. Each fat tip, a couple of inches long, will soon root and produce a new plant.
Cannas Have Lovely Foliage But Few Flowers
Question: I have some very old Canna bulbs. Why do my cannas have lovely foliage but only a spike of a flower? Kansas
Answer: Old-fashioned cannas were grown chiefly for their foliage. The newer hybrids are noted for their gorgeous flowers. It would be well to discard the cannas you are growing and buy some new hybrids in colors of your choice. No amount of pampering will make old strains of cannas bloom like the new hybrids.
Can You Start Cannas Indoors?
Question: Is it necessary to start cannas flowers indoors?
Answer: If your growing season is short and cannas bloom just before killing frosts when planted directly outdoors, it is advisable to start the tubers in March in flats or large pots in a warm cellar or attic.
The Boldness of Cannas In The Landscape
Where a bit of striking color is desirable, cannas plants are the answer for color all summer. Their foliage and blossoms are spectacularly bright.
The thick leaves, which may be dark green, yellow, pink, and green, with red striped leaves or bronze, give a tropical feeling.
Flowers are large and showy, most often in vibrant yellow and scarlet colors, bringing a boldness to the landscape that never goes out of style.
Cannas Stunted With Yellow Stripes
Question: My canna plants are stunted with light and dark green areas or pale yellow stripes in the leaves. Should I destroy the plants and start again?
Answer: Canna mosaic is your problem, especially if the leaves are somewhat wrinkled and curled, with the stems and flower parts showing yellowish bands.
Since infected plants do not recover, they should be destroyed. Mosaic is caused by a virus and is transmitted from infected canna plants or nearby weeds by aphids.
Control mosaic by growing the varieties that are apparently immune, keep down weeds in and around the garden area, and spray or dust regularly with malathion or Neem oil.