Sowing
Sow direct half a centimetre to one centimetre deep, or in trays for transplanting at four or five weeks. Germination takes seven to fourteen days with the soil between 15 °C and 22 °C. Sow every three weeks, because these plants flower quickly and the leaf loses quality once flowering starts. A single sowing is the commonest mistake: you end up with a glut and then nothing for the rest of the season.