Bur Oak vs Green Ash - TreeTime.ca

Bur Oak vs Green Ash

Fraxinus pennsylvanica

Quercus macrocarpa

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(new stock expected: fall of 2026)

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Green Ash
Bur Oak

Green ash is a fast growing tree with incredible golden yellow leaves in fall. This tree is native to the prairies and is well suited for drought and cold. Green ash can also tolerate soil compaction, periods of flooding and a wide variety of soils including alkaline. This makes green ash ideally suited for use in urban environments.

Bur Oak has a wide distribution but is one of the only oaks that will grow well on the prairies. Bur Oak produces deeply lobed, dark green leaves that turn golden yellow to brown in the fall.

Its acorns are round and half enclosed by a mossy fringed cup.

Although slower growing, this long lived tree eventually becomes a popular large ornamental tree for driveways, parks, and the front of industrial buildings. Popular as a memorial or dedication tree.

Note: Most Oak species can be considered toxic for many animals.

Green Ash Quick Facts

Bur Oak Quick Facts

Zone: 2b
Zone: 2b
Height: 18 m (60 ft)
Height: 20 m (66 ft)
Spread: 12 m (40 ft)
Spread: 8 m (28 ft)
Light: full sun
Light: full sun
Moisture: dry, normal
Moisture: dry, normal
Growth rate: fast
Growth rate: slow
Life span: long
Life span: long
Suckering: low
Suckering: low


Fall colour: bright yellow in early fall
Fall colour: yellow to golden brown
Nuts: small acorns
Seeds: seeds located within samaras
Hybrid: no
Hybrid: no
Catkins: no
Catkins: yes

In row spacing: 1.8 - 2.4 m (6 - 8 ft)

Between row spacing: 5 m (16 ft)
Native to: AB, SK, MB, ON, QC, NS, NB, PE
Native to: SK, MB, ON, QC, NB
Other Names: downy ash, red ash, swamp ash, water ash
Other Names: blue oak, burr oak, mossycup oak, scrub oak