Photo by Melody

PlantFiles: Blue Ash
Fraxinus quadrangulata

Family: Oleaceae (oh-lee-AY-see-ee) (Info)
Genus: Fraxinus (FRAK-si-nus) (Info)
Species: quadrangulata (kwad-ran-gew-LAY-tuh) (Info)

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One member has or wants this plant for trade.


over 40 ft. (12 m)

30-40 ft. (9-12 m)
over 40 ft. (12 m)

USDA Zone 4a: to -34.4 C (-30 F)
USDA Zone 4b: to -31.6 C (-25 F)
USDA Zone 5a: to -28.8 C (-20 F)
USDA Zone 5b: to -26.1 C (-15 F)
USDA Zone 6a: to -23.3 C (-10 F)
USDA Zone 6b: to -20.5 C (-5 F)
USDA Zone 7a: to -17.7 C (0 F)
USDA Zone 7b: to -14.9 C (5 F)

Sun Exposure:
Full Sun


Bloom Color:

Bloom Time:
Late Spring/Early Summer


Other details:
Average Water Needs; Water regularly; do not overwater

Soil pH requirements:
5.6 to 6.0 (acidic)
6.1 to 6.5 (mildly acidic)
6.6 to 7.5 (neutral)
7.6 to 7.8 (mildly alkaline)

Patent Information:

Propagation Methods:
From seed; direct sow outdoors in fall
Direct sow as soon as the ground can be worked
By grafting
By budding

Seed Collecting:
Allow seedheads to dry on plants; remove and collect seeds
Properly cleaned, seed can be successfully stored

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By ViburnumValley
Thumbnail #1 of Fraxinus quadrangulata by ViburnumValley

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By Rickwebb
Thumbnail #5 of Fraxinus quadrangulata by Rickwebb

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Thumbnail #7 of Fraxinus quadrangulata by Rickwebb

There are a total of 15 photos.
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5 positives
No neutrals
No negatives

Gardeners' Notes:

Positive Rickwebb On Dec 12, 2013, Rickwebb from Downingtown, PA wrote:

A few large nurseries northwest and west of Chicago did grow this species in the 1990's. I planted three in Hinsdale, IL on the hospital grounds about 1995. One died from transplant shock. The other two did well until the hospital put a huge utility unit in that area, taking out everything. It makes a good shade tree. I like its texture better than the abundant Green Ash. There is a wonderful grove of them growing the the very alkaline dolomitic limestome soil of Glenwood Park on the east bank of the Fox River, off Rt #25, in Batavia, IL , where I took most of my photos. Someone in Bolingbrook, Il, reported some wild ones in that growing town.

Positive BruceStationGar On Aug 19, 2013, BruceStationGar from Bruce Station
Canada wrote:

Deb McCullough of Michigan State did a study on this tree under pressure from emerald ash borer (that is killing ash at a rate of 100%) the blue ash, one of our native ash trees is surviving!! We have to plant more of these trees.

Positive ViburnumValley On Oct 15, 2006, ViburnumValley from Scott County, KY (Zone 5b) wrote:

Blue ash is one of the longest lived trees for central KY, partnering well with the bur oak and chinkapin oak in the agricultural landscapes around the Bluegrass. This tree ranges far into the upper midwest as well, especially on limestone-based soils.

I agree with the other posts here, and also encourage more planting of this tough tree. It is easy to sprout from seed, and more native plant growers are starting to offer small plants.

Positive melody On Nov 12, 2004, melody from Benton, KY (Zone 7a) wrote:

Mainly a Midwestern tree seen in upland, dryish conditions.

Trunk bark whitish and somewhat scaly.Compound leaves 8" to 12" with 7 to 11 leaflets. A tall tree that flowers April/May, fruits are not plump and the wing extends to the seed base.

A nice hardwood tree with many uses, among which is the blue dye that the inner bark produces.

Positive Glowclubbr On Sep 7, 2003, Glowclubbr from Silver Spring, MD wrote:

Endangered in wild in Southern Ontario due to near complete destruction of native forest. It grows very well in cultivation, tolorates limestone soils VERY WELL, and is drought-tolerant.

It can grow fast, usually grows to 60 feet, but can exceed 120 feet. It is an excellent, hardy, extreme heat-tolerant, and sturdy street tree. My own turned a very attractive butter yellow in fall, superior to nearby Green Ashes. I do not understand why there are so many Green Ash hybrids, while the Blue Ash is superior in every way. It also has better foliage. Interestingly, the Blue Ash is the only Ash with square twigs just like the Euonymus alatus.


This plant has been said to grow in the following regions:

Wildomar, California
Batavia, Illinois
Lemont, Illinois
Poplar Grove, Illinois
Clermont, Kentucky
Frankfort, Kentucky
Georgetown, Kentucky
Lexington, Kentucky
Louisville, Kentucky
Nicholasville, Kentucky
Paris, Kentucky
Versailles, Kentucky
Osseo, Minnesota
Cary, North Carolina
Raleigh, North Carolina

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