Canna needs space for roots and broad leaves. Match watering to active growth and check local winter conditions before leaving a pot outside.
Cannas need room for a rhizome system
Choose a substantial container or a suitable sunny bed. Leave space for broad leaves and new shoots rather than squeezing a young plant among slow-growing neighbors. A warm growing season supports the display.
Water active growth adequately
Large leaves can use considerable water in warm weather. Inspect the root zone and water thoroughly when needed, keeping container drainage open. A resting rhizome does not require the same watering as a full leafy plant.
Maintain flowers and leaves
Remove deteriorating material and spent stems as appropriate, while leaving healthy foliage to support growth. Feed active container plants at a suitable labeled rate. A quiet plant in cool conditions will not be forced into strong flowering by concentrated fertilizer.
Plan winter protection
Cannas differ in hardiness, and wet cold can damage underground growth. Follow local guidance for lifting, storage or protected overwintering. Keep labels and inspect resting material so a dormant pot is not repeatedly flooded or discarded as dead.
Related reading
Canna Types: Foliage, Flowers and Mature Size