Sow indoors Sep-Mar. Sow directly from March. Indoors sow 2mm deep into a large 20cm pot of moist well-drained seed compost. Sow 3 seeds per pot. Place in a polythene bag or propagate. Ideal temp. 21°C. Germination takes 14-21 days approx. Grow on seedlings until May. Acclimatise and plant out once danger of frost has passed. Sow directly 6mm deep in drills 30cm apart in well prepared soil that has been raked to a fine tilth. Water regularly. Thin seedlings to 75cm spacing.
Prefers a moderately fertile, well-drained soil in full sun. Shelter from drying winds. Very easy to grow. Fast growing.
Deadhead regularly to extend the flowering window.