This botanical garden in Hakone Sengokuhara was the first one in Japan to be dedicated to wetland plants. The garden contains some 1700 plants, including about 200 types of woody and herbaceous wetland plants from Japan, and 1100 varieties of alpine, grassland, and forest plants, as well as some rare foreign plants. The tour route in the garden is organized according to a progression from lowland to highland, and from early- to later- stage wetlands to illustrate the development of wetlands. The exhibition room introduces animals and plants in the Sengokuhara wetlands with photos, panels, videos, and a large tank. The botanical garden also hosts some events to exhibit seasonal flowers.