Canna rhizomes

Cannas develop quickly once warmth arrives. Broad leaves rise from the rhizomes in strong vertical clumps, followed by flower stems that carry red, orange, yellow, pink or softer-toned blooms through summer and into early autumn. Some Canna varieties are grown as much for their foliage as their flowers, with leaves ranging from fresh green to bronze, burgundy or striped forms that give borders and large containers a more architectural structure.

In the UK, Canna rhizomes are best started under cover in spring, then moved outside once the risk of frost has passed. They respond well to warmth, fertile soil and regular moisture during active growth, particularly when grown in full sun. As the Canna plants establish, their broad leaves create a strong backdrop for lighter grasses and flowering perennials, while compact varieties can bring the same sense of scale to pots and patios.

Cannas are tender, so winter is part of the planning. In colder gardens, lift the rhizomes after the foliage has been cut back by frost and store them somewhere cool, dry and frost free until spring. In milder, sheltered positions they may overwinter in the ground with protection, depending on the variety and conditions. Given that little extra care, Canna plants return each season to build another full display from the ground up.