Mustard Seeds - Misome Choho Hybrid. Non-GMO. Heirloom. Brassica campestris var. narinosa 25 days. One of several hybrids of Komatsuna and Tatsoi, this uniform, easy to grow hardy green has round thick leaves and an upright habit. It has a sweet flavor when raw which becomes more robust when cooked. Approx. 9,250 seeds per oz.