Cotinus coggygria ‘Royal Purple’ Purple Smokebush Description 'Royal Purple' has the darkest foliage of the smokebush cultivars. The new foliage emerges rich maroon-red and retains its color very well through the summer. Spent flower heads resemble puffs of smoke. Can be pruned heavily or left to grow large. Characteristics Hardiness Zone: 4 Light requirements: Sun Height: 10-15' Spread: 10-12' Native: No Sizes & Prices Size: 24'' Ht $44.98 Other Information All Smokebush Purple Smokebush Cotinus coggygria 'Royal Purple' Zone: 4 Sun HT: 10-15'