Mustard greens can be grown in the spring, summer, and fall, though they prefer an air temperature range of 60 - 75° . Direct sow seeds outdoors 4/15 - 8/30. For baby greens, broadcast sow seeds ½” deep, 60 seeds per square foot. For mature leaves, sow seeds 1” apart in rows 18” apart. Days to germination: 4 - 10. Sow every 3 weeks for continuous harvest, or let them re-seed themselves to have low maintenance self-sowing, edible “weeds”. Keep well watered during hot weather. It can grow in part shade. Tolerant of light frosts.
Brassica juncea is insect pollinated and will cross-pollinate with other Brassica juncea mustards (which are not that common). Isolation distance: ½ mile. Minimum population size: 10 plants. Collect seeds from the best plants once pods have turned from green to tan but before seeds have been released. Clean seed as a dry-seeded crop.