Nanohana or Na No Hana (Brassica campestris) is the Japanese name for rape blossom; are rapeseed plants which are widely eaten as spring greens in Japan. Boiled Nanohana plants are dressed with Karashi mustard dressing. Use tender nanohana plants with flower buds. The nanohana plant is entirely edible, and the plant it is also the source of healthy Canola oil. Nanohana is a springtime flower, and in some areas of Japan you can find fields of the flower formed into mazes so visitors can wander through the blossoms and enjoy their beauty. Nanohana bloom just before sakura here in Japan, so they are kind of a prelude to spring, even though they are beautiful in their own right. Nanohana, in Japanese literally translates into 'Vegetable Flower' but it also can be read to mean wild flower, or flower of the field. the plant is completely edible. March, is the Nanohana season for most of Japan.Nanohana in Japan are also celebrated in the art and culture of Japan, such as in clothing patterns, souvenir books, toys, gift arrangements, candles, and a Nano Hana sweet traditionally made with azuki beans available in the early spring at many Japanese markets which look like Nanohana flowers. Nanohana is called Hanana in Kyoto.