WHITE ASH(Fraxinus americana)
Deciduous broadleaf. Opposite. Pinnately compound. 20 - 30 centimetres long. Usually 7 leaflets (5-9) leaflets, 6 - 13 centimetres long. Paired. Elliptical. Finely sawed tooth; almost without teeth. Dark green above. Whitish and sometimes hairy beneath. Turn yellow to purple in fall. Flowers:
6 mm long. Purplish without corolla. Many in small clusters before leaves in early spring. Male and female flowers on separate trees.Fruit:
2.5 - 5 cm long.
Brownish key with narrow wings. Hanging in clusters. Mature in late summer and autumn.Twigs:
- Gray or brown.
- Mostly hairless.
Dark gray. Thick. Deep diamond-shaped furrows and forking ridges.Height:
24 metres. Diameter:
- 0.6 metres.
White Ash does not grow as fast as Green Ash, but it will eventually become a larger tree.
Species Requirements Distribution Range:
S. Ontario east to Cape Breton Island, south to N. Florida, west to E. Texas, and north to E. Minnesota.
Zone: 3 to 9
Moist soils of valleys and slopes, especially deep well-drained loams.
In forests, with many other hardwoods.Preferred Light:
Tolerance to Salt:
Moderately high tolerance.
Tolerance to Shade:
Moderately shade-tolerant. Preferred Soil:
Soil Type: Sandy or loam. pH Range: 3.7 to 7.0 Not tolerant of clay or poorly-drained soils.
Dieback. Witches' broom. Anthracnose. Leaf spots. Cankers. Powdery mildew. Heart rot.Common Pests:
Ash borer. Carpenter worm. Red-headed ash borer. Lilac borer. Lilac leaf miner. Fall webworm. Brown-headed ash sawfly. Ash flower gall. Oystershell scale.Problems:
- Canker and dieback may occur for no apparent reason and may occasionally cause dead wood.
- Susceptible to many problems; however, vigorous, healthy trees can avoid most problems.
- Borers and scale insects are the most common insect problems.
- Anthracnose and rust are common disease problems.
- Sensitive to ozone.
- Nice shade and street tree.
- Pruning time is not critical.
- Transplants readily.
- Select seedless varieties over standard ones.
Back to Species List