30-40 Days to maturity. Brassica rapa var Pekinensis 'Maruba santoh round'. Maruba Santoh Round Chinese Cabbage Seeds. Annual. Maruba Santoh Round has an acknowledgeable heat tolerance that is greater than most Chinese cabbages. If you live in an area with warm summers you may want to try this variety for a longer harvest before your plant's bolt. Enjoy these large rounded leaves and juicy white stems in your upcoming summer salads, stir-fries, soups, and more. ~ 7,625 seeds per oz.