30 to 40 Days to maturity. Raphanus sativus. Saisai Purple Leaf Radish Seeds. Annual, Hybrid. This red-stemmed leaf radish will stand out in any dish you make with it! Saisai Purple leaf radishes were bred as a baby leaf green. Their leaves are tender with scalloped edges, and the edible stems are distinctively bright red. Saisai radishes are slow to bolt and can be grown year-round in cooler climates. They are also great for sprouting! If you’re looking for a peppery and nutritious microgreen, this variety is a great choice. Approximately 1,300 seeds / oz.