Paul Aden of New York registered this cultivar in 1980. It is a cross between H. 'Wide Brim' × H. 'Royal Rainbow'. 'Snow Cap' forms a large size (19 inches high) mound of broadly ovate, moderately cupped foliage with
thick substance in the center of the leaf. Near white flowers bloom in
June and July.
The Hostapedia by Mark Zilis (2009), it is "...difficult to grow; margins often tear (not
draw stringing); smaller than 'Northern
Halo'; not recommended."
continues "...as more and more plants
matured in gardens, it became evident that its beautiful white
margin melted out by midsummer. The result is what I call the "sawtooth"
effect i.e., a jagged margin which often turns brown on the torn