This non-registered but patented (U.S. Plant
Patent 14,232) cultivar is a sport of H. sieboldiana 'Elegans'.
It was introduced by
Allen Crowder of North Carolina in 2002. The mound reaches large size (27 inches high
by 63 inches wide) with leaves that are heavily corrugated, wavy and somewhat unruly but
with thick substance. Near white flowers bloom from mid-June into July.
The Hostapedia by Mark Zilis (2009), "Information published by the U.S. Plant and
Trademark Office lists 'Thunderbolt' as differing from the similar 'Dream Weaver' by having a wider margin and more "deeply furrowed"
leaves...Unfortunately, try as I might, I cannot see any difference between the
two and do not agree that 'Thunderbolt' has a wider margin. I'll keep studying!"
Similar cultivars include H. 'Dream
Queen', H. 'Dream
Weaver' and H. 'Great