Heinz Klose from Germany originated and Peter Ruh of Ohio registered this hybrid of H. 'Tardiflora' × H. 'Elegans' in 1987. It grows into a medium size hosta about 18 inches in height with a spread of 32 inches. The deep blue leaves are slightly wavy and have thick substance. Pale lavender flowers bloom in July.

According to The Hostapedia by Mark Zilis (2009), "...translates to "Irish Sea" which is sometimes the listed cultivar name. It is a Tardiana-type cultivar with rich blue foliage."

Nomenclature changes recommended in the 1991 book The Genus Hosta by W. George Schmid and accepted by The American Hosta Society would update names as follows: H. x tardiana is now Tardiana Group.

An article by W. George Schmid in The Hosta Journal (1985 Vol. 16) states that, "In England, Heinz Klose obtained a number of H. x tardiana plants after Eric Smith left Hadspen House nursery. He is also actively selecting and propagating H. 'Semperaurea' seedlings...Named by him are several hybrid seedlings: H. 'Goldpfeil' ('Gold Arrow'), H. 'Weisse Glocke' ('White Bell'), and H. 'Zitronenfalter' ('Lemon Butterfly')...special cultivars with H. 'Sieboldiana' lines are: H. 'Blauglut' ('Blue Glow') and H. 'Blaue Wolke' ('Blue Cloud') which reminds one of H. 'Blue Heaven'...with his H. x tardiana...has named one H. 'Irische See' ('Irish Sea')...H. 'Nordatlantic' ('North Atlantic')..."