Mibuna Mustard Seeds. 41 Days. Brassica rapa var. japonica. Open Pollinated, Non-GMO. Similar mizuna greens, the mibuna mustard is a flavorful Japanese green strap leaf mustard with mild mustard flavor. Although very similar to mizuna plant, mibuna is differentiated by its smooth, pointed leaves rather than the sharp and serrated leaves of mizuna.

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