45 Days to full maturity, 20-30 Days for baby leaf, 10-15 Days for microgreens. Brassica rapa subsp. narinosa. Red Tatsoi, Pak Choi Seeds. Annual, Hybrid. Cool Season. This vigorous hybrid has medium sized, spoon-shaped red-violet leaves and a mild, sweet mustard flavor. It is a cut and come again cabbage providing multiple harvests from just one plant. Harvest from baby leaves for salads up to full maturity. ~ 5,600 seeds per oz.