This fast growing hybrid of H. 'Potomac Pride' × H. 'Neat Splash Rim' was
Beverly and Dave Stegeman of Indiana in 2004. It is a medium size
(16 inches high by 40 inches wide)
plant with very shiny dark green foliage. The leaves are
heavily corrugated, cupped with thick substance. Medium purple
flowers bloom in July.
The Hostapedia by Mark Zilis (2009), "Its combination of shininess, dark green color, and large
puckers of corrugation gives 'Midnight Oil' a high level of
Field Guide to Hostas by Mark Zilis (2014), "The leaves...are so shiny that a first time view might think, 'Did someone
spray vegetable oil on that plant?' Its shininess is likely the greatest found
in any hosta."