Oemleria Cerasiformis

Description

Oemleria cerasiformis, also known as Osoberry, Indian Plum, or Pacific Plum, is a deciduous shrub native to western North America. This plant belongs to the Rosaceae family and produces fragrant, small white flowers in early spring, followed by edible fruit that resembles a plum. The fruit is an important food source for many wildlife species, including birds, bears, and deer.

Taxonomic Information

Appearance

The Osoberry shrub can grow up to 20 feet tall and wide, but typically reaches around 10 feet. The leaves are oval-shaped, dark green, and have a glossy appearance. In fall, the leaves turn yellow and red before falling off. The flowers are small, white, and have a sweet fragrance that attracts pollinators such as bees and butterflies. The fruit is a round drupe that is green when young and turns red-purple when mature.

Care Guide

Osoberry is a low-maintenance plant that is easy to care for. Here are some tips:

• Water: Water regularly during the growing season, but avoid overwatering. Osoberry can tolerate drought once established.
• Fertilization: Fertilize lightly in early spring with a balanced fertilizer.
• Soil: Osoberry prefers well-draining, loamy soil. Amend heavy clay soil with organic matter to improve drainage.
• Sunlight: Osoberry prefers partial shade but can tolerate full sun in cooler climates.
• Hardiness Zones: Osoberry is hardy in USDA zones 5-9.

Common Pests & Diseases

Osoberry is generally free of serious pests and diseases. However, it may be susceptible to the following:

• Aphids: These small insects feed on the leaves and can cause curling and distortion. Use insecticidal soap to control them.
• Powdery mildew: This fungal disease appears as a white, powdery coating on the leaves. Improve air circulation and avoid overhead watering to prevent it.
• Fire blight: This bacterial disease causes wilted, blackened leaves and shoots. Prune infected branches and sterilize pruning tools to prevent its spread.

Habitat

Osoberry is found in a variety of habitats, including woodlands, meadows, and stream banks. It prefers moist, well-drained soils and can tolerate both sun and shade. This plant is commonly found in the western United States and Canada.

Question and Answer

Q: Is Osoberry an invasive species?

A: No, Osoberry is not considered an invasive species. It is a native plant that provides important habitat and food for wildlife.

Q: Can Osoberry be grown in containers?

A: Yes, Osoberry can be grown in containers, but it may not reach its full size potential.

Q: How often should I prune Osoberry?

A: Prune Osoberry in late winter or early spring before new growth appears. Remove dead, damaged, or crossing branches, and shape the shrub as desired.

Q: Can Osoberry fruit be eaten by humans?

A: Yes, Osoberry fruit is edible and has a sweet, juicy flavor. However, the fruit is small and may not be as palatable as cultivated fruit species.

Related Plants

• Prunus serotina (Black cherry)
• Prunus virginiana (Chokecherry)
• Prunus emarginata (Bitter cherry)
• Prunus subcordata (Klamath plum)

References

• Arno, S. F., & Hammerly, R. P. (2007). Northwest Trees: Identifying and Understanding the Region’s Native Trees. Mountaineers Books.
• Dirr, M. A. (2011). Dirr’s Encyclopedia of Trees and Shrubs. Timber Press.
• USDA Plants Database. (n.d.). Oemleria cerasiformis. Retrieved from https://plants.usda.gov/home/plantProfile?symbol=OEMLE