Sinapis alba L. (white or yellow mustard), Brassica nigra L. Koch (black or true mustard), Brassica juncea L. Czern. et Cosson (oriental, leaf, or Indian mustard)
Thin to 25 cm (10″) apart
Plant seeds 3 mm (1⁄8″) deep
Best in full sun, but can handle a bit of shade.Rich, moist, well-drained, well-prepared soil with a pH of no less than 6.0.
Seeds will sprout in 3-10 days.
Pest and disease resistant, but good to protect from cabbage loopers and cabbage worms with a floating row cover.
For fall harvests, set plants in the garden 4-6 weeks before the first expected frost. In spring, you can start about 4 weeks ahead of the last frost date and continue planting a little after.
Mulch to keep soil moist. Not as frost-hardy as kale, but piquant mustard greens do tolerate a light frost, which makes their leaves sweeter.