Starting off indoors, sow onto moist well-drained seed compost. Cover with compost and keep at around 10-15°C (50-59°F). Transplant resulting seedlings when large enough to handle into 9cm (3½") pots and harden off for 2-3 weeks before planting out at 60cm (24") spacing. Can be sown directly from April. Sow 10mm (1/3") deep into a warm, moist, weed-free seedbed. Cover with soil. When the seedlings have 2 true leaves, thin to 10cm (4") apart. Cover with cloches or fleece if the weather is cold. When the danger of frost has passed move to final spacings of 60cm (24").