cultivar is a sport of
H. longissima from Japan
of unidentified origin . It is a small size
plant with green, strap-like foliage which has a white
marginal variegation. Flowers are medium purple in color
with purple anthers and are borne from mid-September to
Mizu Gibōshi, the "margined swamp hosta" is a
white-margined sport of the species (H. longissima)
found growing in the wild in Shimoyama."
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 fukurin as margined or edged.