70 days to maturity. Perilla frutescens var. frutescens. Korean Shiso Herb Seeds (Perilla). Warm season annual. Perilla is a lovely Korean herb that is a vivid green on the top and a soft purple on the underside of the leaves. Both the flowers and the leaves are edible and delicious. Widely used in various types of Asian cooking, perilla has a fresh flavor that has hints of basil, citrus, and mint. This annual herb is beautiful, tasty, and all-around a versatile choice. You can even grow it as a microgreen! ~ 23,300 seeds / oz.