Mustard Seeds - Red Mizuna - Hybrid. Non-GMO. Brassica rapa Japonica group. 20-25 days for baby leaf, 40-50 days to mature. Cool season annual. This small broad leaf mustard has a mild pungency and good red leaf and vein color that intensifies in cold weather. Its leaves are similar to green mizuna but with less deeply cut margins. Approx. 11,100 seeds / oz.