Green Ash
Green ash once seemed almost indestructible across northern towns and river bottoms; emerald ash borer has changed that assumption permanently.
Artwork inspired by Paul Barr
The tree tolerates flooding, drought, wind, and alkaline soil better than many hardwoods, explaining its widespread use in shelterbelts. Female trees produce winged samaras that feed birds, while dead and declining ash now reshape woodland structure as the invasive borer spreads.
Report suspected new infestations through state forestry channels and never move firewood long distances. Stay long enough to see normal behavior, but not so close that Green Ash retreats or stops feeding. Leafy May–October; seeds persist into winter.
- Best clue
- Opposite compound leaves, diamond-ridged bark, and clusters of paddle-shaped samaras
- Habitat
- floodplains, coulees, shelterbelts, and moist woodland
- Regional status
- Native tree under invasive-pest pressure
Quick guide
- First read
- Opposite branching
- Second evidence
- Emerald ash borer risk
Recognize Green Ash in its plant community
- Recognition
- Opposite compound leaves, diamond-ridged bark, and clusters of paddle-shaped samaras
- Habitat
- Concentrate on floodplains, coulees, shelterbelts, and moist woodland.
- Seasonal context
- A useful record of Green Ash pairs diagnostic detail with a wider view of floodplains, coulees, shelterbelts, and moist woodland. Add time and weather while they are still fresh.
- Evidence to record
- Photograph the opposite buds, compound leaves, bark, and samaras together. Record floodplain conditions and nearby trees; never infer identity from a damaged street tree alone.
Good to know
Green ash became a shelterbelt staple because it tolerates wind, drought, flooding, and alkaline soil—traits now complicated by the spread of emerald ash borer.
Notice these
- Opposite branching
- Five to nine leaflets
- Paddle-shaped samaras
- Emerald ash borer risk