in Japan, this
cultivar is a seedling of
rectifolia × H. 'Tokudama'.
It is a large size hosta with rich blue-green foliage
and an upright growth habit. The leaves are ovate,
slightly wavy and have smooth texture. It bears lavender
flowers on very tall scapes.
The Hostapedia by Mark Zilis (2009), "...known as 'Krossa Regal' in the U.S."
Mikiko Lockwood in an article on The Hosta Library titled,
A Little About Japanese Hosta Terms defines the term ginba as silver (white) leaf.