Japanese Long Cucumber Seeds (Aimers International). Variety originated in Japan. This burpless cucumber produces crisp, easy to digest, non-bitter fruit to 40 cm (16”) or longer. Fruit is slightly curved with few seeds. Best harvested at 30 cm (12”) long. For straighter fruit, vigorous growing vines should be grown on a trellis. With its small seed, this cucumber makes a great pickler when harvested young.