small size, green colored hosta is a non-registered cultivar
which is a form of H. longissima found in
Japan. Flowers are medium purple in color and are borne from
mid-September to October.
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 shirobana as white flower.