Sow February-March under glass in gentle heat. Can be sown direct outdoors in April-May for flowers June-September.
Transplant seedlings spaced 5cm apart in trays and grow on in good light. Acclimatise plants before planting 15-23 cm apart in an open sunny position.
Ensure that temperatures are mild and all chance of frost has passed before planting out, as Orange Winner is a half hardy plant.