Semi-double blooms, ‘frilled and pleated’ liked a Victorian petticoat, sit above compact, bushy foliage. Gorgeous delicate flowers, ideal for ‘cottage gardens’.
Sow indoors for surest results, February-June, 0.5cm (¼”) deep, in a tray of compost. Water well and place in a cold frame, unheated greenhouse, or on a warm kitchen windowsill. Keep moist. Seedlings usually appear in 21-42 days. Transplant individually, when large enough to handle, to 7.5cm (3″) pots. Always hold seedlings by a leaf, never by the stem. Gradually accustom young plants to outside conditions, before planting out into well-drained soil, June-October, 30cm (1′) apart. Or, sow outdoors, April-June, in a seed bed, 0.5cm (¼) deep, into finely-prepared, well-drained soil, which has already been watered. Thin seedlings to 5cm (2”) apart, before planting out to flowering position in autumn. Flowers: May-July, the following year.
The trimming back of dead stems, after flowering, will encourage the plants to remain as a compact clump.