A hybrid of H. 'Neat Splash' × an unnamed seedling, this cultivar was registered by Mildred Seaver of Massachusetts as part of her Sea Series in 1984. The foliage turns more green as the season progresses. It forms a large size (24 inches high by 49 inches wide) mound with wavy, slightly corrugated leaves. The medium lavender flowers open from mid-July into August.

According to The Hostapedia by Mark Zilis (2009), "In addition to forming a fairly dense mound of attractively variegated, wavy foliage, 'Sea Dream' possesses a fast growth rate, making it an excellent choice as a specimen plant or large ground cover."

The New Encyclopedia of Hostas by Diana Grenfell (2009) states: "Protect the thinnish leaves from strong wind. Increases rapidly."