Sow thinly in pots or trays in a propagator on a windowsill or in a greenhouse in quality, moist compost at approximately 18-20ºC (64-68ºF), 6mm (¼") deep and lightly cover with compost or vermiculite (germination 14-20 days). Transplant resulting seedlings spacing them out 5cm (2") apart in trays and grow on. Plant out 35cm (14") apart. Alternatively sow thinly direct into finely raked, moist, warm and weed-free soil 6mm (¼") deep. Thin seedlings out for final spacing of 45cm (18") apart.