The Hostapedia by Mark Zilis (2009), this is a sport of the streaked H.
'Sea Lightning' and is almost indistinguishable from it. Technically,
H. 'Sea Thunder' is more
stable with a wider white medial
variegation pattern. Part of the "Sea
Series" of hostas, this plant was developed by
Mildred Seaver of Massachusetts and registered on her behalf by
Kevin Walek (Hosta Registrar) in 2009.
This cultivar is of large size
(20 inches high by 48 inches wide) and has elliptic to ovate shaped leaves that
are slightly wavy, slightly rippled and moderately corrugated with average
substance. The leaves are dark green with a creamy yellow to
white medial (center) variegation. Pale purple flowers are borne on 3 foot high
scapes from late July into mid-August.
Mark Zilis (2009), says "It makes a superb
mound of variegated foliage topped by relatively tall scapes of
pale purple flowers."
An article by Akira Horinaka in
Hosta Journal (2006 Vol. 37 No. 1) says, "Other
white-centered hostas with bold green borders are 'Banana Boat', 'Warwick
Delight', 'Pandora's Box', 'Sea Thunder' and 'Fire and Ice'. Those with a narrow
green border include 'Morinji Nishiki',
'Otome-no-mai', 'Hakuba' and 'White Christmas'."