Paul Aden 1978. ‘Chartreuse Wedge’ x (nigrescens x ‘Blue Vision’). Blue-green leaves, heavily textured, holds color well into summer. Fertile lavender flowers. Good grower. George planted the one in the picture 5 feet away from a Blue Angel (to right of True Blue in picture) so there would be a nice walking path between the two. Now 10 years later the path is overgrown.