Choose a canna for bold, often large foliage and a strong tropical-looking display; choose a calla for its distinctive sculptural spathe and more restrained flower form. The best choice still depends on the exact cultivar, available space and winter conditions.
Canna and calla are different plants despite similar common names. Neither should be chosen solely from the word “lily” on a label.
Compare the plants
| Feature | Canna | Calla |
|---|---|---|
| Botanical group | Canna, in Cannaceae | Zantedeschia, in Araceae |
| Visual effect | Broad foliage and conspicuous flowers; strong mass or background planting | Distinctive spathe around a central spadix; useful as a focal plant or cut flower |
| Size | Dwarf and tall cultivars; check the named selection | Compact hybrids and larger white arum forms; check the label |
| Life cycle | Perennial, often grown seasonally where tender | Perennial, with winter behavior varying by type and climate |
| Winter plan | Cold-sensitive plants may need protected storage | Tender colored callas need protection; white arum differs |
A plant grown as a one-season display in a cold region has not thereby become botanically annual. Likewise, a perennial label does not promise that it will survive your winter outdoors.
Match light and moisture
The RHS canna guide describes sunny, sheltered planting and the need for water during dry spells. Do not select ordinary cannas as a universally low-water option simply because their foliage looks tough. Special water cannas have their own uses.
Callas also differ within their group. White Zantedeschia aethiopica can tolerate wetter situations than many colored hybrids. Consult the RHS Zantedeschia guide for that distinction rather than assuming every calla should grow in standing water or deep shade.
For either plant, a container exposes roots to different drying and temperature patterns than an established bed. Check the actual growing medium and exposure.
Decide how much visual space you want to fill
For a large summer backdrop, compare mature canna height and leaf color. For a smaller container or an architectural flower accent, a compact calla may fit better. Neither choice is automatic: some cannas are compact, and white arum lilies can become substantial.
Mark the expected spread in the planting area. Leave access to paths and neighboring plants rather than planning from nursery-pot size. Repeated cutting is not a good substitute for selecting an appropriate mature size.
Include winter care in the choice
In a cold climate, ask whether you have somewhere suitable to protect the plant or its dormant rhizomes. Follow the exact type’s storage guidance; do not assume the same watering and dormancy routine works for both genera.
A large planted container may be difficult to move even when the plant itself is manageable. Include that practical constraint before buying, along with the cost of containers, planting medium and any protection.
Consider pets and handling
Callas contain irritating calcium oxalates and should be kept away from pets that chew plants. ASPCA’s calla entry describes the risk. Seek veterinary advice after suspected ingestion.
Do not infer a plant’s safety from a similar common name or use ornamental plants in food. Choose a position that suits the household as well as the design.
Which should you buy?
Choose the named canna that fits your space if foliage and a bold seasonal display are the priority. Choose an appropriately sized calla if its flower form and container or cutting use appeal more. Prices depend on cultivar, size and supplier; one genus is not always more expensive.
For detailed planting and seasonal care after choosing a calla, see the separate calla lily care guide. Keep this comparison focused on choosing the right plant rather than applying one care schedule to both.
