Plant in well-drained soil in a sunny or lightly sheltered spot, and keep consistently moist but not waterlogged. Commonly grown as a tender annual, to overwinter, move the plant into a greenhouse, conservatory, or bright frost-free room. In early spring, cut back the flowered stems to within 2cm (about 1in) of last year’s growth to encourage fresh shoots.

No deadheading is required, though the plant will flower more vigorously with regular feeding using a balanced liquid fertiliser during the growing season.

Regular watering and occasional light pruning of straggly growth will help maintain a compact, bushy shape and a long flowering season.