Green ash (Fraxinus pennsylvanica)

White ash (Fraxinus americana)

Ash trees make up a large part of our urban forest.  They are not native to Colorado and are not well adapted to our dry climate.  These trees are susceptible to invasive pests such as Emerald Ash Borer.

Ash_Thumbnail_5500347-PPTThe twigs have a bud at their end.  
The leaves form a 'D' shaped scar.

Photo:  T. Davis Sydnor, The Ohio State University,
Ash_Seed_5561574-ThumbnailSingle seeds form in a 1to 2 inch long winged pod (samara).

Photo: Whitney Cranshaw, Colorado State University,
Ash_leaf_Thumbnail_Boor_2017Leaves are compound with 5 to 9 leaflets arranged opposite. Each compound leaf has a terminal leaflet.
Leaf edges are smooth.

Photo: JCISM
Ash_twig_Thumbnail_Boor_2017Branches are arranged opposite each other.

Photo: JCISM
Ash_bark_Thumbnail_Boor_2017Trunk to 2 feet in diameter.  
Mature bark is greyish with fissures in a diamond pattern.

Photo: JCISM
Ash_trees_Thumbnail_Boor_2017Trees are medium sized and can reach 40+ feet tall

Photo: JCISM


Colorado State Forest Service - Ash ID

Minnesota Department of Natural Resources

Clemson University - ASH ID YouTube video

Wisconsin Department of Agriculture ASH ID YouTube video