H. nigrescens in
its background this cultivar has been around for a long time in
Japan. It was registered by
Peter Ruh of Ohio in 2002. A semi-upright mound, it grows to
28 inches high and 5 feet wide. The foliage is cupped,
moderately corrugated and has thick substance. It bears lavender
The Hostapedia by Mark Zilis (2009), this cultivar is "...named for the Tenryu River
Japan) that is the same as or a seedling of
H. nigrescens. "
Seedlings include H. 'Allegheny
River', H. 'Presence of Mind' and H. 'Tenny Up'.