This sport of H. 'Fortunei
Hyacinthina' has chartreuse margins briefly in the spring
which turn to green for the remainder of the season. It is a
large size (24 inches high) plant that bears lavender flowers
from late July into August.
The Hostapedia by Mark Zilis (2009), this cultivar "...which appears to
be the same as 'Joker', is not a particularly exciting plant."