Spacing Seeds should be planted inch deep and plants thinned to a plant every 2-4 inches. Rows may be as close as 15 inches apart, or you can plant mustard in a wide row by scattering seeds in a band 5-6 inches wide. Care Mustard requires water during dry periods to keep the tender foliage from becoming limp. Mustard that produces a large plant too early may bolt or produce a seedstalk with bright yellow flowers instead of producing only foliage. Once seedstalk development starts, leaves should be quickly harvested and used.
Harvesting Cut the leaves when they are young and tender.
You can cut the entire plant or individual leaves to allow the plant to continue to grow and produce more leaves. Leaves harvested in hot weather will be strong flavored and tough. Store leaves in a plastic bag in a refrigerator for 2-3 weeks.