Cotinus coggygria ‘Royal Purple’

Cotinus coggygria ‘Royal Purple’: A Majestic Smoke Tree with Striking Foliage and Smoky Blooms

Cotinus coggygria ‘Royal Purple’, commonly known as the Royal Purple Smoke Tree or Smokebush, is a deciduous shrub or small tree. It is popular for its striking foliage and unique, smoke-like flower clusters. This shrub is native to regions spanning from southern Europe to central China. The Smoke Tree is a popular choice in gardens worldwide. They introduced ‘Royal Purple’ into the United States in 1953, however, they developed it at Lombarts Nursery in Boskoop, Holland. This cultivar is popular for its compact growth habit and the deep, rich purple hue of its leaves.

Plant Family

Cotinus coggygria belongs to the Anacardiaceae family, which includes other notable plants such as sumacs (Rhus) and poison ivy. The genus name, Cotinus, derives from the Greek word “kotinus,” meaning olive, while the specific epithet “coggygria” comes from “kokkugia,” meaning smoke tree in Greek.

Description

Cotinus coggygria ‘Royal Purple’ is an upright, loose-spreading, multi-stemmed shrub that typically reaches heights of 10-15 feet (3-4.5 meters) and spreads 15-20 feet (4.5-6 meters) wide. Its foliage is the plant’s standout feature, with ovate to obovate leaves that emerge a rich maroon-red in spring and mature to a dark purplish-red to purplish-black as the season progresses. These leaves, about 3 inches (7.6 cm) long, retain their vibrant color throughout the growing season without much fading.

In late spring to early summer, ‘Royal Purple’ produces small, insignificant yellowish flowers in branching terminal panicles, each 6-8 inches (15-20 cm) long. These flowers turn into billowy hairs attached to elongated stalks of the spent flower clusters, turning a smoky pink to purplish pink, giving the shrub its characteristic “smoky” appearance.

Care Instructions Cotinus coggygria ‘Royal Purple’:

• Light: Full sun is essential for the best leaf coloration and overall plant health.
• Soil: Cotinus coggygria ‘Royal Purple’ prefers average, medium moisture, well-drained soils. It is adaptable to various soil types, including poor, rocky, and infertile soils, but it does not tolerate wet, poorly-drained conditions. Sharp drainage is essential.
• Watering: Water deeply and regularly during the first growing season to establish an extensive root system. Once established, the shrub is drought-tolerant and requires less frequent watering.
• Fertilization: Apply a balanced fertilizer in early spring to support new growth.
• Pruning: Prune lightly in early spring if flowering is desired. For better foliage and larger leaves, cut back hard every few years in late winter to early spring to promote the growth of vigorous new shoots, but note that this will sacrifice the blooms.

Propagation

Propagation of Cotinus coggygria ‘Royal Purple’ is typically done through stem cuttings:

1. Timing: Take semi-hardwood cuttings in late summer.
2. Cuttings: Select healthy, non-flowering shoots and cut 4-6 inches (10-15 cm) long segments.
3. Preparation: Remove the lower leaves, leaving only the top pair.
4. Rooting Medium: Place the cuttings in a well-draining mix of sand and peat or a similar rooting medium.
5. Environment: Keep the cuttings in a warm, humid environment with indirect light. A greenhouse or a covered propagation tray can provide ideal conditions.
6. Transplanting: Once the cuttings develop a strong root system, typically in a few months, they can be transplanted into individual pots or directly into the garden the following spring.

Ornamental Features and Landscape Use

‘Royal Purple’ Smoketree’s dramatic foliage and smoke-like flower clusters make it an excellent addition to any landscape. The foliage maintains its color throughout the summer and transforms into stunning shades of scarlet red in the fall. This shrub is ideal for use as a specimen plant, in borders, or as part of a hedge. It can also be planted in groups to create a striking visual impact. Its tolerance to deer, drought, and various soil types, coupled with its unique aesthetic appeal, makes it a versatile and resilient choice for gardeners.

Insects, Diseases, and Other Plant Problems

Cotinus coggygria ‘Royal Purple’ is relatively pest and disease-free. However, it can occasionally be susceptible to leaf spot, rust, and verticillium wilt. The plant’s sap can cause contact dermatitis in sensitive individuals, as it contains urushiol, the same irritant found in poison ivy.

In summary, Cotinus coggygria ‘Royal Purple’ is a visually stunning and versatile shrub that brings unique texture and color to the garden. With its ease of care, adaptability, and striking appearance, it is a valuable addition to any landscape design.