This non-registered cultivar is a seedling of H. longipes originated by Kenji Watanabe of the Gotemba Nursery in Japan. It is a miniature size plant with green foliage that has a white, glaucous bottom.

Mikiko Lockwood in an article on The Hosta Library titled, A Little About Japanese Hosta Terms defines the term iwa as rock, Iwa Gibōshi or H. longipes and the term urajiro as white-backed or white underside.