The Yoshino cherry trees typical of Japan originated in Komagome. There were many professional gardeners in the Komagome Somei area during the Edo era, and it was known as a good location for viewing flowers throughout the seasons. Yoshino cherry trees are said to have been popularized throughout Japan by gardeners from Somei from the end of the Edo period through the early Meiji era.
The Toshima Tourism Association holds a Somei-Yoshino cherry blossom tourism ambassador contest once every two years to choose tourism ambassadors who fit the Yoshino cherry image. The cherry blossom tourism ambassadors engage in various activities and brighten up various events, not just for the Tourism Association, but also in the community and at sister cities, promoting Komagome, the birthplace of Yoshino cherry trees, throughout Japan.