
The Bunkyo Hydrangea Festival, or Ajisai Matsuri, is held annually in mid-June and stands as one of the district’s five major floral celebrations. The event is centered at Hakusan Shrine and extends into the adjacent parkland, where approximately 3,000 hydrangea bushes come into full bloom. The display features a wide variety of species, from the traditional gaku-ajisai (lacecap) to the vibrant, globe-shaped hon-ajisai. These flowers line the shrine’s ancient stone pathways and monuments, creating a lush, colorful landscape that is particularly celebrated during Tokyo’s rainy season.

A distinctive highlight of the festival is the temporary opening of the Fuji-zuka, a miniature man-made mound representing Mt. Fuji. While usually closed to the public, visitors are permitted to climb the small peak via a path flanked by blooming hydrangeas during the festival dates. For those seeking the best photographic opportunities, a weekday morning visit is advisable to bypass the significant weekend crowds. The shrine is conveniently located within a short walk of several local subway stations, making it a highly accessible destination for seasonal viewing.