Autumn Purple Ash Tree

Autumn Purple ash is a male, seedless selection of white ash valued for its dense crown and rich fall foliage. Its leaves may turn deep purple, mahogany, or orange-yellow, making a large open site the best place to appreciate the seasonal display. [Oregon State University's Landscape Plants database](https://landscapeplants.oregonstate.edu/plants/fraxinus-americana-autumn-purple) describes the cultivar's form, foliage, seedless habit, and USDA Zone 4 hardiness; a [nursery profile](https://nursery.supertrees.com/products/autumn-purple-ash) gives a broader mature-size range. ## Form and seasonal color The crown starts pyramidal and rounds with age. Glossy dark-green compound leaves provide summer shade before the fall display develops. Published dimensions vary: Oregon State reports about 40 feet tall by 25 feet wide, while the nursery profile lists 40 to 60 feet tall and 30 feet or more wide. Leave generous room and confirm local mature-size expectations before placing it near structures or pavement. ## Site Deep, moist, well-drained soil supports growth, and full sun produces the best fall color. Oregon State describes the cultivar as rapid growing and hardy to USDA Zone 4. Autumn Purple is a white ash selection discovered at the University of Wisconsin and introduced through nursery production; its cultivar identity is sometimes associated with the synonym ‘Junginger’. ## Maintenance Establish a strong central structure early and remove damaged or crossing branches with selective pruning. Check local guidance on ash pests and diseases, and monitor the tree after planting for stress or dieback.