- A fast growing variety that is best known for its green-purple leaves that are commonly used in wasabi.
Organic Osaka Purple Mustard Seeds. 40 - 80 days to maturity. Can be grown in containers. Can be grown as microgreens. Brassica juncea. Heirloom, Non-GMO, Annual. 45 days to maturity. Originated in Japan, Osaka Purple is 12 to 14 inches tall. ~ 15,000 Seeds/ounce.