This cultivar is a sport of
rectifolia from Japan which was first named by
Dr. Fumio Maekawa around 1940. It is a large size plant about 19 inches
high by 32 inches wide with shiny, medium green colored
foliage. The leaves are moderately corrugated, wavy and
have good substance. Medium purple flowers bloom from
late July into August.
Field Guide to Hostas by Mark Zilis (2014), "It can be found amongst grasses and other perennials in
full sun within a few hundred meters of the Japan Sea...has been marketing this plant under the cultivar
name 'Tonoko Tachi for a few years, though this
contradicts a statement I made on page 957 of
The Hostapedia. I stated that Tonoko Tachi "is
not a cultivar but a Japanese
common name for H.
rectifolia pruinosa..." Obviously, I changed my
thinking a bit on the subject and now consider 'Tonoko
Tachi' an acceptable name for marketing purposes."
Mikiko Lockwood in an article on The Hosta Library titled,
A Little About Japanese Hosta Terms defines the term tachi as upright, 'Tachi Gibōshi' or