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Oze NP, Fukushima
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In early to mid-July, Hirozawa’s white Watasuge puffs are at their showiest—but they aren’t flowers. They’re seed-bearing tufts that catch the wind and help this wetland plant spread.
Another summer show paints Hirozawa gold: Kinkōka flowers can make the wetland look carpeted in yellow. An Oze visitor-center field report recorded this bright display at Hirozawa.
A national vegetation survey listed Hirozawa’s wetland plant community at 9 hectares—compared with 3.5 hectares for neighboring Kumazawa Tashiro. They’re distinct marshes on the same mountain route.
At about 1,740 m, Hirozawa is the first wetland “landing” on Mt. Hiuchi’s north route. After crossing it, hikers climb again to Kumazawa Tashiro, around 1,940 m—a pair of marshy steps on the mountainside.
A yellow flower field can hide hard-to-see wear: 2024 Environment Ministry surveys found many deer trails through Hirozawa and Kumazawa, with some ground becoming bare from repeated trampling. Monitoring helps track the marshes’ condition.
