This cultivar is a hybrid of H. 'Invincible' × H. 'Northern Halo' which was registered by Greg Johnson 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.

According to The Hostapedia by Mark Zilis (2009), "It is widely considered to be the earliest blooming, fragrant-flowered hosta."

The Hosta Journal, (2000 Vol. 31, No. 1) states that H. 'Moonlight Sonata' is the earliest blooming of the fragrant hostas.

In an article in The Hosta Journal (2016 Vol. 47 No 2), the author described this plant's flowers as having a "Very Weak" fragrance compared to other hostas.