Prunus × yedoensis is a hybrid cherry tree between Prunus speciosa as father plant and Prunus pendula f. ascendens as mother. It is a hybrid born in Japan and one of its cultivars, Prunus × yedoensis 'Somei-yoshino' or Yoshino cherry, is one of the most popular and widely planted cherry cultivars in temperate regions around the world today. 'Somei-yoshino' is a clone from a single tree, and has been propagated by grafting all over the world. 'Somei-yoshino' inherits Edo higan's quality of blooming before the leaves unfold and it growing into a large-sized tree. It also inherits the characteristics of the Oshima cherry, which grows rapidly and has white flowers. These characteristics are favored and have become one of the most popular cultivars of cherry trees.

Toshima is a special ward in the Tokyo Metropolis in Japan. It is one of the eight central wards of the Tokyo Metropolitan area. Located in the northern area of Tokyo, Toshima is bordered by the wards of Nerima, Itabashi, and Kita in the north and Nakano, Shinjuku, and Bunkyo in the south.