This cultivar is a hybrid of H. 'Invincible'
and H. 'Northern Halo' which was registered by
of Iowa in
2004. It forms a large size (20 inches high by 48 inches wide) mound of blue-green foliage
which changes to green as the season progresses.
Near white flowers bloom from mid-July into August.
The Hostapedia by
(2009), "It is widely considered to be the earliest
blooming, fragrant-flowered hosta."
The Hosta Journal, Vol. 31, No 1, page 91, states that H. 'Moonlight
Sonata' is the earliest blooming of the fragrant hostas.