6-12 Days to maturity. Brassica rapa var. perviridis. Japanese Komatsuna Microgreen Seeds. As microgreens, Komatsuna retains much of the nutritional value and flavor profile of its mature counterpart but is concentrated in tiny, tender leaves. These microgreens showcase a vibrant green color, tender texture, and a flavor that’s a milder echo of the mature plant’s peppery taste. Komatsuna microgreens are a fantastic way to add a nutritional punch and aesthetic appeal to dishes. ~ 10,000 seeds/oz.