What cultivar is noted for its vibrant purple leaves called Royal Purple?

The cultivar known for its vibrant purple leaves is Cotinus coggygria 'Royal Purple', commonly referred to as the Royal Purple smokebush. This plant is prized for its striking foliage that exhibits a deep, rich purple color, especially during the growing season. The leaves can sometimes take on a reddish hue in the fall, enhancing its ornamental value.

Cotinus coggygria is a deciduous shrub or small tree that not only offers beautiful foliage but also features fluffy, smoke-like flower clusters in late spring to early summer. This characteristic gives rise to its common name, "smokebush." The intense coloration of 'Royal Purple' makes it a preferred choice for landscape design, functioning well as a focal point or as part of a colorful hedge.

Other options do not share the same vibrant purple leaf characteristic. Corylus avellana 'Contorta', known as the Harry Lauder's Walking Stick, features twisted branches rather than colorful foliage. Berberis thunbergii 'Crimson Pygmy' has dark red leaves but is distinct from the deep purple of the Cotinus variety. Rockspray Cotoneaster is more recognized for its ornamental berries and ground cover properties rather than for foliage color.