slow growing giant size (32 inches high by 74 inches wide) cultivar
was introduced in 1986 by
Lucille Simpers of Indiana.
The foliage has 18 veins and is medium green in color
with no variegation. It has fertile, very pale lavender flowers in
July. H. 'Big
Boy' is a H. montana
The Hostapedia by Mark Zilis (2009), "It belongs to the group of
macrophylla look-alikes - all great, centerpiece plants
for the shade garden."