Cultivation
Cannas grow best in full sun with moderate water in well-drained rich or sandy soil. Cannas grow from perennial rhizomes but are frequently grown as annuals in temperate zones for an exotic or tropical look in the garden. In arid regions, cannas are often grown in the water garden, with the lower inch of pot submerged. In all areas, high winds tear the leaves so shelter is advised.
The rhizomes are frost tender and will rot if left unprotected in freezing conditions. In areas which go below about −10 °C (14 °F) in the winter (< USDA Zone 8), the rhizomes can be dug up before freezing and stored in a protected area (above 7 °C/45 °F) for replanting in the spring. Otherwise, it is recommended that cannas are protected by a thick layer of mulch overwinter.
The following is a list of canna cultivars that have gained the Royal Horticultural Society's Award of Garden Merit.
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