Sow outdoors where they are to flower. Before sowing, prepare the ground well by raking until the soil is fine & crumbly & remove any large stones. Sow 1.5mm (1/16) deep, in rows 30cm (12) apart, or scatter seed in beds or borders as a gap filler & lightly cover over. Thin out the seedlings when they are large enough to handle, to about 20cm (8) apart.