Sow direct into finely raked, moist, warm soil where the plants are to flower at a depth of 6mm (¼") and cover the seed lightly with soil. Germination usually takes 10-14 days. Thin out/plant out young plants to a final spacing of 20cm (8") apart, removing any competing weeds. Sow Feb-May for autumn flowering or June-July for spring. Keep well ventilated to prevent mildew. Fully winter hardy if sown as a biennial.