55-75 Days to maturity. Cucumis sativus var. yamato sanjaku Yamato Sanjaku Cucumber Heirloom Seeds. Warm-season annual heirloom. Non-GMO. This traditional variety is from the historic Yamato Province now known as Nara Prefecture in Japan. “Sanjaku” means three feet in Japanese. This cucumber variety produces a generous crop of remarkably long, narrow fruit that are best when they reach about 2 feet long. The fruits have white flesh and a relatively small seed cavity. Approximately 1,100 seeds per oz.