For flowering the first year, sow your seeds early in the year in a propagator using a good quality, moist seed compost and place on a windowsill or in a greenhouse at approximately 15°C (60°F) to germinate (usually 20-90 days). Alternatively sow in a well-raked seedbed outdoors April-June 3mm (1⁄8") deep and cover lightly with soil. Transfer to a site in full sun or partial shade in autumn for flowering the following year spacing the plants 41cm (16") apart.