Native Plant Spotlight - Oso Berry

What is Oso Berry?

Oso berry or Oemleria cerasiformi is a deciduous shrub native to the Pacific Northwest coastal region. It is one of the earliest native plants to leaf out and flower in the late winter. It is seen as an early indicator that spring is on the way. The flowers are small and white and appear before the leaves. The plant will produce a blue/purple colored small cluster of fruit. The berry is edible to humans though many consider it to have a bitter taste with a slight cucumber-like flavor.

 

Oso Berry as a Wildlife Plant

Oso berry is a great option if you are looking for a quick growing deciduous shrub that attracts birds to your backyard. Oso berry is a simple but lush native plant that can easily be incorporated into landscaping or wildlife garden layouts. The early flowering time provides early pollen and nectar sources for both birds and insects. When the fleshy fruits develop they provide an early summer food source for passing mammals and birds. They are particularly favored by cedar waxwings (Bombycilla cedrorum) and evening grosbeaks (Coccothraustes vespertinus).

Plant Growth Habits

The mature plant can reach 4.5-6 m in height and 1.5-3 m width. The plant can be planted in part shade to sun. When planted in areas with more sun the plant will have a denser form. The plant has a tendency to develop sucker growth resulting in eventual spread. This spreading behavior makes the Oso berry a great choice for hedge row plantings. In general Oso berry is a relatively low maintenance shrub. Pruning may be necessary to maintain size and shape if a less wild appearance is desired. The plant is also relatively drought tolerate once well established. However, it is beneficial to water newly planted shrubs for the first two years while the plant is establishing roots.