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Oze NP, Gunma
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A pull-tab can found beside Yamanohana’s boardwalk in 2021 recalled Oze’s litter crisis: it once had about 1,400 bins. In 1972, local hut operators launched a take-your-trash-home campaign that spread nationwide.
Oze’s forest green tree frogs face an unusual nursery problem: open wetland ponds have few trees. Around Ozegahara, they often attach their white, foamy egg masses directly to pond banks instead.
One local theory says Yamanohana means “mountain’s nose”: from here, Mt. Shibutsu’s foothill appears to jut into the marsh like a nose. A visitor-center ranger shares it as a place-name explanation.
Despite its name, the Botanical Research Model Garden isn’t an ornamental display; it is a slice of Oze’s natural wetland. A short loop passes ponds, uneven bog, and even floating islands.
Fresh food for Yamanohana’s remote huts arrives on porters’ backs or by helicopter—there’s no road. In a 2015 interview, the fourth-generation keeper said his hut served warm meals made with local ingredients.
A small, still pool near the research garden’s entrance stays warmer than snowmelt flowing in from Mt. Shibutsu. Mountain brown frogs lay clear egg masses there each year—a tiny nursery in the highland.
Look closely at the garden’s wetland floor for sundews: their sticky leaves trap insects, which the plants use for nutrients. These tiny hunters are easy to miss among the bog’s larger flowers.
In 2024, rangers recorded Oze-kohone and Hitsuji-gusa flowering together in one garden pond—a rare pairing. Their roots occupy different depths: about 1.5 m and 1 m, respectively.
In 1966, Gunma used this research garden in experimental wetland-recovery work, sowing native seeds in damaged areas. Its guide map still invites visitors to compare sparse ground with surrounding vegetation.
Yamanohana Hut began in 1929 as Katashina Hut, a refuge built by Katashina Village. It stood farther toward Ozegahara than the present site—an origin story rooted in shelter, not tourism.
A 1952 winter ski trip brought then-Crown Prince Akihito, later Emperor Emeritus, to Yamanohana Hut when Oze had more than 3 m of snow. The hut’s keeper showed the Foundation dishes said to be from that stay.
Spot a Japanese stoat, called okojo, or a dormouse, and Yamanohana’s Visitor Center has awarded a discovery certificate. It’s a charming little prize for a fleeting encounter with Oze wildlife.
The trail from Yamanohana up Mt. Shibutsu is uphill-only. Its east-face serpentinite is slippery, and descending risks damaging fragile plants beside the path, so the rule protects visitors and vegetation alike.
Ozegahara’s uppermost wetland, stretching from Yamanohana, is 上田代, read “Kami-tashiro.” The same kanji elsewhere on Oze’s Hiuchi-backside trail is read “Uwatashiro”—one map label, two local readings.
