Sow seeds any time of the year. Mustard can be grown in trays of compost or on the surface of pads of cotton wool, flannel, kitchen towel etc. Place the growing medium in a small container or saucer and moisten well, then spread the seed thickly over the surface. Place in a polythene bag and leave in a warm place.
Keep the seeds dark until after germination and then move to a warm well lit spot ensuring that the medium stays moist. They are ready to cut in about 8-11 days after sowing.