Caltha palustris
The garden was established in 1958. It now includes more than 800 species, with a particular focus on willows and alpine plants, as well as collections of Cactaceae and other succulents, Iris, Lilium, Paeonia, Rosa, Syringa, and conifers such as Podocarpus. Specific species include Belamcanda chinensis, Caltha palustris var. nipponica, Carex podogyna, Lysichiton camtschatcense, Menyanthes trifoliata, Myrica gale var. tomentosa, Potamogeton distinctus, and Primula japonica.