A hybrid of two unnamed seedlings, this
cultivar was registered by
Paul Aden of New York in
1986. It forms a large size (24 inches high) mound with leaves that
have a deeply lobed base, are moderately corrugated and wavy.
Lavender flowers bloom in July producing many red colored pods.
The Hostapedia by Mark Zilis (2009), this cultivar "...rates as an excellent choice for
general landscaping purposes in the shade. It can be used as a
large ground cover, in small groups, or as a specimen plant. It
is, however, difficult to distinguish from 'Christmas
Tree', so grow one or the other."
Field Guide to Hostas by Mark Zilis (2014), "Recently, The
American Hosta Society
Cultivar Origination Commission determined that 'Christmas
Tree' and 'Grand Master' are the same plant."
An article by Warren I. Pollock in
Hosta Journal (1992 Vol. 23 No. 1) states that, "Can
anyone tell me how to distinguish between 'Grand Master' and 'Resonance'?...I've
kept only two plants and they are now good-size mature clumps. But the labels
got mixed up,...I've spent considerable time examining them. My conclusion is
that they look identical...Sandra
Bond says that 'Ground Master' flowers are
darker than 'Resonance'."