Green ash (Not recommended)

Summer foliage of green ash.

Due to susceptibility to emerald ash borer (EAB), green ash is not recommended for planting anywhere in this region and usually requires removal and/or replacement. Green ash is a highly adaptable native tree; very cold hardy and tolerant of a wide range of soil pH and moisture levels. Currently, ash trees cannot be sold in Illinois. Check with your state for quarantine restrictions. 

"This species is native to the Chicago Region according to Swink and Wilhelm's Plants of the Chicago Region, with updates made according to current research."  

Botanical name:

Fraxinus pennsylvanica

All Common Names:

green ash, red ash

Family (English):

Olive

Family (Botanic):

Oleaceae

Tree or Plant Type:

  • Tree

Foliage:

  • Deciduous (seasonally loses leaves)

Native Locale:

  • Chicago area,
  • Illinois,
  • North America

Size Range:

  • Large tree (more than 40 feet)

Mature Height:

50-60 feet

Mature Width:

25-40 feet

Light Exposure:

  • Full sun (6 hrs direct light daily),
  • Partial sun/shade (4-6 hrs light daily)

Hardiness Zones:

  • Zone 2,
  • Zone 3,
  • Zone 4,
  • Zone 5 (Chicago),
  • Zone 6,
  • Zone 7,
  • Zone 8,
  • Zone 9

Soil Preference:

  • Moist, well-drained soil,
  • Wet soil

Acid Soils:

  • Tolerant

Alkaline Soils:

  • Tolerant

Salt Spray:

  • Tolerant

Soil Salt:

  • Tolerant

Drought Conditions:

  • Tolerant

Poor Drainage:

  • Tolerant

Planting Considerations:

  • Aggressive,
  • Weak wood and branch structure

Ornamental Interest:

  • Fall color,
  • Persistent fruit/seeds

Season of Interest:

  • Early fall,
  • Mid fall

Flower Color & Fragrance:

  • Inconspicuous

Shape or Form:

  • Oval,
  • Round,
  • Upright

Growth Rate:

  • Fast

Transplants Well:

  • Yes

Wildlife:

  • Game birds,
  • Insect pollinators,
  • Migrant birds

More Information:

Tree & Plant Care

This tree is tolerant of wet sites, dry sites, alkaline soils, poor soils and wind.

Disease, pests, and problems

Susceptibility to the emerald ash borer makes this tree unsuitable for the landscape.

Native geographic location and habitat

C-Value: 1

Commonly found in wet, lowland sites.

Bark color and texture 

The bark is light gray and loosely ridged and furrowed.

Leaf or needle arrangement, size, shape, and texture

Compound leaves are in pairs (opposite), with 5 to 9 leaflets on each leaf.
Leaves are dark green in summer, changing to yellow or yellow green in fall.

Flower arrangement, shape, and size

Male and female flowers on separate trees (dioecious).  Not ornamentally important.
Flowers appear in spring.

Fruit, cone, nut, and seed descriptions

Fruit are winged seeds borne in clusters.

 

 

Location of Fraxinus pennsylvanica (Green ash (Not recommended)) at the Arboretum