Cotinus

Description

Cotinus is a genus of flowering plants in the family Anacardiaceae. These deciduous shrubs or small trees are commonly known as smoke trees due to the cloud-like, billowy plumes of pink, purple, or yellow flowers that appear in spring or summer. The name “smoke tree” also refers to the smoky-grey appearance of the leaves and bark, which contrast beautifully with the colorful flowers. Cotinus is native to North America, Europe, and Asia, and there are around 6 species in the genus.

Taxonomic Information

Domain	Eukarya
Kingdom	Plantae
Phylum	Tracheophyta
Class	Magnoliopsida
Order	Sapindales
Family	Anacardiaceae
Genus	Cotinus

Appearance

The smoke tree is a unique plant with a striking appearance. It typically grows to a height of 10-15 feet with a spread of 10-12 feet. The leaves are ovate or elliptic, and range in color from green to blue-green. When the leaves first emerge in spring, they have a reddish tint. In fall, they turn shades of yellow, orange, and red. The flowers appear in dense, airy clusters that resemble puffs of smoke. The flowers are followed by small, spherical fruits that turn brown and persist into winter.

Care Guide

Cotinus is a relatively easy plant to care for, but it does require some attention to thrive. Here are some tips for keeping your smoke tree healthy:Water: Cotinus prefers well-drained soil that is kept consistently moist. Water deeply once a week during the growing season, and reduce watering in fall and winter.Fertilization: Feed your smoke tree with a balanced fertilizer in early spring, before new growth appears.Soil: Cotinus grows best in well-drained soil that is slightly acidic. Avoid heavy clay soils, which can cause root rot.Sunlight: Cotinus prefers full sun to partial shade. It will tolerate some shade, but flowering may be reduced.Hardiness Zones: Cotinus is hardy in zones 5-9.

Common Pests & Diseases

Cotinus is relatively pest and disease-resistant, but it can be susceptible to a few problems. Here are some common issues to watch out for:Canker: This fungal disease can cause dieback and cankers on the branches. Prune affected branches and dispose of them properly.Verticillium wilt: This soil-borne fungus can cause yellowing, wilting, and dieback of branches. There is no cure, so infected plants should be removed and destroyed.Aphids: These small insects can suck the sap from the leaves, causing them to curl and distort. Spray affected leaves with a strong stream of water, or use insecticidal soap if the infestation is severe.

Habitat

Cotinus is native to North America, Europe, and Asia. It grows in a variety of habitats, including woodland edges, rocky slopes, and open meadows. Cotinus prefers well-drained soil and full sun to partial shade.

Question and Answer

Q: Can I grow Cotinus in a container?A: Yes, Cotinus can be grown in a container as long as the container is large enough to accommodate the root system. Use a well-draining potting mix and water regularly.Q: When should I prune my smoke tree?A: Prune your smoke tree in late winter or early spring, before new growth appears. Remove any dead or diseased wood, and shape the plant as desired.Q: Do smoke trees attract pollinators?A: Yes, smoke trees are attractive to bees, butterflies, and other pollinators.Q: Can I propagate Cotinus from cuttings?A: Yes, Cotinus can be propagated from softwood or hardwood cuttings taken in spring or summer. Dip the cuttings in rooting hormone and plant them in well-draining soil.

Related Plants

Here are some related plants to Cotinus:

• Anacardium occidentale (cashew tree)
• Mangifera indica (mango tree)
• Pistacia vera (pistachio tree)
• Rhus typhina (staghorn sumac)

References

• “Cotinus.” Missouri Botanical Garden, www.missouribotanicalgarden.org/PlantFinder/PlantFinderDetails.aspx?kempercode=g930.
• “Smoke Tree.” The Spruce, 19 Feb. 2021, www.thespruce.com/smoke-tree-growing-profile-3269285.
• “Cotinus.” Plant Care Today, 9 Mar. 2020, plantcaretoday.com/cotinus-smoke-tree-growing-care.