Originated in Japan, this non-registered cultivar is a sport of H. longissima. The plant forms a small size (9 inches high by 25 inches wide) mound with narrow foliage which has a shiny on top and bottom. The dark green leaves have white marginal variegation and are narrowly elliptic (strap shaped), smooth textured without waves. It has average substance. Flowers are medium purple in color with purple anthers and are borne from mid-September to October followed by viable seeds.

Mikiko Lockwood in an article on The Hosta Library titled, A Little About Japanese Hosta Terms defines the term mizu as water, 'Mizu Gibōshi' or H. longissima and the term yama as mountain and the term fukurin as margined or edged.