Height: 6′-9′ Spread: 5′-8′. Broad rounded to upright shrub with numerous dense racemes of 1″ to 1 1/4″ pure white, sweetly fragrant flowers appearing in early summer. This is the only mock orange at the USDA Experimental Station in Cheyenne that is still blooming and doing well after many years of neglect. This native to the western U.S. was discovered by Meriwether Lewis and named in his honor. Full sun. Plant Select® 2001. Zone 3.