The dimensions of the ash tree are highly dependent on the growing site and soil conditions. The height of the European ash varies from 20-30 m, maximum 40 m. The branchless log has a length of 15-20 m and a diameter of 0.4-0.9 m.

The wood we mainly use from ash is the very broad sapwood whose color varies from white to yellowish or light yellow-brown. Freshly sawn wood may additionally exhibit a pinkish hue. Exposed to light, bare ash becomes more yellowish in color over time.

Due to the erratic course of the core, brown/white striped or flamed (in crowns or on quarter) wood occurs, which is referred to as olive ash. Ash is known for its toughness. Growth ring width greatly affects the toughness of this wood species. Ash with wide growth rings is therefore much stronger and tougher than ash with narrow growth rings.