Canna and Calla lilies are distinct tropical plants known for their vibrant blooms and unique foliage, often confused but easily distinguished by flower shape and growth habits.
Understanding the Basics of Canna and Calla Lily
Canna and Calla lilies might share the word “lily” in their common names, but they belong to entirely different plant families and exhibit strikingly different characteristics. Both are popular in gardens worldwide due to their exotic appearance, yet their flowers, foliage, and growth requirements set them apart.
Cannas are large, tropical perennials from the family Cannaceae. They thrive in warm climates and are famous for their bold, broad leaves that resemble banana plants. Their flowers appear on tall stalks and come in bright reds, oranges, yellows, and even variegated patterns. Cannas grow from rhizomes—underground stems that store nutrients—allowing them to spread vigorously under the right conditions.
Calla lilies belong to the genus Zantedeschia within the family Araceae. Despite being called lilies, they are not true lilies but rather part of the arum family. Their signature feature is a smooth, trumpet-shaped spathe that surrounds a central spadix where tiny flowers cluster. These elegant blooms come in white, pink, purple, yellow, and even dark maroon shades. Callas grow from tubers rather than rhizomes.
Visual Differences Between Canna And Calla Lily
One of the easiest ways to tell these two apart is by looking at their flowers. Cannas boast clusters of open-faced flowers with multiple petals that resemble tropical hibiscus or gladiolus blooms. The petals can be ruffled or smooth and often have vibrant color gradients.
Calla lilies display a single curved petal-like spathe that wraps around a spike-like spadix. This look is sleek and sculptural—almost architectural. The spathe’s shape is often compared to a funnel or an elegant vase.
Their leaves also differ notably: Canna leaves are large, paddle-shaped with pronounced veins and sometimes have red or bronze tints. Calla lily leaves tend to be arrow-shaped with glossy surfaces often marked with white spots or variegation.
Growth Habits and Cultivation Needs
Both plants enjoy warm growing conditions but have distinct preferences when it comes to soil moisture and sunlight.
Cannas thrive in full sun with rich, well-draining soil that retains moisture without becoming soggy. Because of their tropical origins, they flourish near water bodies or moist garden beds but don’t tolerate standing water for long periods. Cannas can reach impressive heights—sometimes up to 6 feet—with lush foliage providing a dramatic backdrop in landscapes.
Calla lilies prefer partial shade to full sun depending on the climate; too much direct sunlight can scorch their leaves in hotter regions. They love consistently moist soil and can even grow well in shallow water environments like pond edges or bog gardens. Callas tend to be shorter than cannas, usually growing between 1 to 3 feet tall.
Both plants require protection from frost since cold temperatures can damage rhizomes or tubers underground. Gardeners often dig up these storage organs during winter in colder zones for indoor storage until spring.
Propagation Techniques for Canna And Calla Lily
Propagation differs between these two as well:
- Cannas: Propagated primarily by dividing rhizomes during dormancy periods (early spring or fall). Each division needs at least one growing eye (bud) to sprout successfully.
- Calla Lilies: Can be propagated by dividing tubers or through seeds—though seed propagation is slower and less common among gardeners.
Division encourages healthier plants with better flowering potential because overcrowded rhizomes or tubers reduce vigor over time.
Flowering Periods and Uses in Landscaping
Cannas bloom profusely throughout summer into early fall when given favorable warmth and sunlight. Their bright flowers attract hummingbirds and butterflies while adding tropical flair to borders or container gardens.
Calla lilies bloom mainly in late spring through summer depending on planting time but can continue sporadically if conditions remain ideal. Their graceful form makes them favorites for cut flower arrangements, weddings, and formal garden settings.
In landscaping design:
- Cannas provide height, texture contrast with broad leaves, and bold color splashes.
- Callas offer elegance with sculptural flowers suited for minimalist or modern garden themes.
Both plants also work well near water features due to their moisture-loving nature.
Nutritional Value and Edibility Aspects
Though primarily ornamental, parts of these plants have traditional uses:
- Canna: The rhizomes of some species are edible after cooking; they contain starches similar to potatoes. Indigenous cultures have utilized cannas as food sources during lean times.
- Calla lily: Generally considered toxic if ingested raw due to calcium oxalate crystals causing irritation; therefore not recommended for consumption.
Gardeners should always exercise caution around pets or children who might accidentally ingest parts of calla lilies.
Common Pests And Diseases Affecting Both Plants
Despite their hardiness, cannas may suffer from issues like:
- Canna leaf rollers – caterpillars that chew on foliage creating ragged holes.
- Bacterial blight – causing leaf spots leading to yellowing.
- Rust fungus – orange pustules appearing on leaves under humid conditions.
Calla lilies face challenges such as:
- Aphids – sap-sucking insects that distort new growth.
- Bacterial soft rot – tuber decay causing foul odor.
- Powdery mildew – white powdery coating on leaves under poor air circulation.
Good cultural practices like proper spacing, watering at soil level (not foliage), removing damaged parts promptly help keep problems manageable without heavy chemical use.
Differences Summarized: Canna And Calla Lily Comparison Table
| Feature | Canna | Calla Lily |
|---|---|---|
| Family | Cannaceae | Zantedeschiaceae (Araceae) |
| Flower Type | Open-faced multi-petal clusters | Smooth trumpet-shaped spathe & spadix |
| Leaf Shape & Texture | Large paddle-shaped with prominent veins; sometimes bronze/red tinted | Arrow-shaped glossy leaves; often spotted/variegated |
| Growth Habit & Height | Tall stalks up to 6 feet; spreading rhizomes | Shrubby clumps 1-3 feet tall; tuberous base |
| Preferred Light Conditions | Full sun preferred for best flowering | Partial shade to full sun depending on climate tolerance |
| Water Needs & Soil Type | Moist well-drained soils; tolerates wet conditions briefly | Damp soils; thrives near ponds/boggy areas |
| Toxicity / Edibility | Eatable rhizomes after cooking (some species) | Toxic if ingested raw; causes irritation |
Caring Tips For Thriving Canna And Calla Lily Plants
To get the best performance from your cannas:
- Select a sunny spot with rich soil amended with organic matter.
- Keep soil evenly moist but avoid waterlogging which leads to root rot.
- Add balanced fertilizer monthly during growing season for vigorous blooms.
- Mound soil over rhizomes slightly after planting to protect against frost damage.
For calla lilies:
- Avoid harsh afternoon sun if you live somewhere hot; morning sun with afternoon shade works wonders.
- Keeps soil consistently damp especially during active growth phases.
- Avoid overhead watering to reduce fungal disease risk.
- Dormant tubers benefit from dry storage indoors if winters dip below freezing.
With proper care both plants reward gardeners with spectacular floral displays year after year.
Key Takeaways: Canna And Calla Lily
➤ Canna lilies thrive in full sun and moist soil.
➤ Calla lilies prefer partial shade and well-drained soil.
➤ Canna flowers are vibrant and attract pollinators.
➤ Calla lilies have elegant, trumpet-shaped blooms.
➤ Both plants add tropical appeal to gardens.
Frequently Asked Questions
What are the main differences between Canna and Calla Lily flowers?
Canna flowers have open-faced blooms with multiple petals, often ruffled or smooth, in bright colors like red and orange. Calla lilies feature a single, trumpet-shaped spathe that wraps around a central spadix, giving them a sleek, sculptural appearance in shades such as white and purple.
How do the leaves of Canna and Calla Lily differ?
Canna leaves are large, paddle-shaped with strong veins and sometimes show red or bronze hues. In contrast, Calla lily leaves are arrow-shaped with glossy surfaces and may have white spots or variegation, making their foliage quite distinct from Cannas.
Do Canna and Calla Lily require different growing conditions?
Yes, Cannas prefer full sun and rich, well-draining soil that stays moist but not soggy. Calla lilies also enjoy warm conditions but typically need slightly different moisture levels and can tolerate partial shade better than Cannas.
How do Canna rhizomes differ from Calla Lily tubers?
Cannas grow from rhizomes, which are underground stems that spread horizontally to store nutrients. Calla lilies grow from tubers, which are swollen underground storage organs. This difference affects how each plant spreads and is propagated in gardens.
Are Canna and Calla Lily related despite their similar names?
No, Cannas belong to the family Cannaceae while Calla lilies are part of the Araceae family. Although both share “lily” in their common names, they come from entirely different plant families with unique characteristics.