Sow the seed thinly direct into finely raked, moist, warm, weed free soil where the plants are to flower, 6mm (¼") deep. (Germination 14-30 days). As the seedlings develop, thin them out in stages to achieve a final spacing of 25cm (10"). Use the spare plants to fill any spaces. Remove any weeds as they develop, but be very careful not to disturb the young plants. Alternatively sow September for early flowering next year.