About 70 species of ash grow in the world, and about 16 are native to North America. Only one, Oregon ash, Fraxinus latifolia, is native to the Northwest. Many others are common landscape and roadside plantings, notable for their bright yellow to red fall foliage. All ash trees are susceptible to emerald ash borer, an invasive pest first sighted in Oregon in June 2022. The insect was introduced to Michigan in about 2002 and has spread rapidly, causing extensive mortality of all native ash species.
Browse the galleries below to learn about:
- Ashes in general
- Our only native ash, Oregon ash
- Several of the predominant non-native ash and ash cultivars (a cultivar is a plant that people have bred for desired traits)
- Trees that might be confused with ashes
- Common riparian trees in Oregon that grow in association with Oregon ash