Since receiving 9 or 10 fans in September 2012, I've been impressed with how robust this SPEC-X is. Last year the flowers emerged with a yellow ground that changed to a luminous white by day two. The clump has multiplied well and the new foliage really draws the eye with its mixture of new golden leaves and older green leaves, a trait shared with a presumed parent, I. pseudacorus. The registered height of 18 inches may be affected by culture because in my sandy loam I've noted the clump tops 3 feet.