Seeds - Growing Mustard
Mustard seeds are ready to harvest when the plants turn yellow and the seeds are dry and brittle. Cut the plants at the base, just above the soil line, and tie them in small bunches. Hang the bunches upside down in a warm, dry place to dry further. Once the seeds are completely dry, thresh them by rubbing the plants between your hands or using a machine. Winnow the chaff to separate the seeds from the debris.