70-90 day maturity. Vigna unguiculata subsp sesquipedalis. Kurosanjaku Yard Long Bean Seeds. Non-GMO, Heirloom. Warm-season annual. This fast growing, high-yield bean thrives in the heat. It is a black seeded variety and is one of the most popular types grown. These extra long dark green stringless beans are highly prized for their sweet and crunchy pods. Traditionally interplanted with arugula and bitter melon vines for increased pest resistance, faster growth, and efficient use of space. Approx. 180 seeds per oz.