This
tissue culture sport of H.
'Blue Mammoth' was
registered by Mark Zilis in 2003. It grows
over 2 feet tall with a spread of 65 inches wide with oblong to
ovate leaves that are moderately corrugated and have thick
substance. The near white flowers start to bloom in late June.
According to
The Hostapedia by Mark Zilis
(2009), "...listings of this cultivar keep
showing up as 'Wooly Mammoth' (versus the correct 'Woolly
Mammoth')."
Similar cultivars include H.
'Golden Tusk'.