Sow from February to May under cover for flowers in the first year, providing vibrant cottage garden displays ideal for borders and cutting. For blooms the following summer, sow outdoors in July in a prepared seedbed or directly into well-drained soil. Seeds should be sown very shallow — about 2mm deep, just covered with a dusting or fine layer of soil or vermiculite. They need light for good germination, so avoid burying them too deeply.
Sow in trays, modules, or pots and place in a cold frame or unheated greenhouse. Keep compost just moist until germination. Transplant seedlings when large enough to handle, spacing them well, and grow on before planting into final positions in early autumn or the following spring.