Outdoor sowing - choose a sunny position and sow thinly direct into finely raked, moist, warm, weed-free soil, 6mm (¼") deep. Germination 10-21 days. Thin seedlings by degrees to a final spacing of 25-30cm (10-12"). Indoor sowing - in pots or trays in a windowsill propagator or greenhouse at 15-20˚C (60-68˚F), 6mm (¼") deep in finely sieved, moist compost. Transplant seedlings into trays 5cm (2") apart and grow on prior to planting out.