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Omaha tree guide

True ash trees

Fraxinus spp.

Nebraska Forest Service describes green ash as abundant in Nebraska and records emerald ash borer in Omaha.

Sources checked: 2026-08-02Next source review: 2027-02-02Independent professional review: not completed

What this page can tell you

How to recognize this kind of tree

This profile covers North American true ash species in the genus Fraxinus; it does not distinguish an individual ash species.

These species-level facts cannot diagnose the condition of one particular tree, prove that work is needed, or determine whether it is hazardous.

What to look for

  • Leaves, buds, and stems occur opposite one another, and leaves are compound with typically 5–11 leaflets.
  • When present, paddle-shaped seeds hang in clusters into late fall or early winter.
  • The Nebraska Street Trees guide treats ash alternatives as large-tree planning context; mature size varies by Fraxinus species.

What changes by season

Use whatever features are available now. Missing leaves, flowers, fruit, or pods often just means the timing is wrong—not that the tree cannot be a match.

When leaves are on

Compare opposite leaves or buds paired at the same point, several leaflets on one shared stem, and many small leaflets. Use more than one feature and do not force a match from leaf shape alone.

When leaves are off or hard to see

Compare diamond-patterned ridges, a rounded tree, and a narrower upright tree. Bark and overall shape can help narrow it down, but neither confirms the species by itself.

When fruit or seeds are present

paddle-shaped seeds in clusters can provide another useful clue. Not seeing them may simply reflect season, age, sex, or variety.

Typical mature size

The Nebraska Street Trees guide treats ash alternatives as large-tree planning context; mature size varies by Fraxinus species.

Similar Omaha trees

These are the closest lookalikes among the 10 common local trees in this guide. Other species can still look similar.

Honeylocust

Gleditsia triacanthos

These trees can look similar in whether the leaf is simple or compound, leaf shape, and mature size. Check how the leaves or buds attach, bark, and fruit or seeds next instead of relying on the name or one photograph.

View that tree profile

Kentucky coffeetree

Gymnocladus dioicus

These trees can look similar in whether the leaf is simple or compound, overall tree shape, and mature size. Check how the leaves or buds attach, leaf shape, and bark next instead of relying on the name or one photograph.

View that tree profile

Important Omaha-area context

Emerald ash borer attacks North American true ash, and Nebraska Forest Service documents it in Douglas County and Omaha.

This does not prove that a particular tree is infested, diseased, structurally unsound, or in need of removal.

What to consider for an individual tree

Canopy thinning, branch dieback, or D-shaped exit holes warrant confirmation because similar signs can have other causes. After an ash is killed, falling-branch potential increases quickly; species identity alone does not show that this tree is infested, dead, or hazardous.

A healthy ash in a good location does not require urgent removal solely because it is ash; treatment or removal decisions require evaluation of the individual tree.

Sources