Fraxinus quadrangulata
Blue Ash

The Blue Ash earned its common name from the blue dye made by early Americans from the inner bark, which contains a substance that turns blue with exposure to air. This tree is naturally found upland in dry, rocky limestone areas and is very drought tolerant. As with all ashes, Fraxinus quadrangulata is extremely susceptible to the Emerald Ash Borer. Damage from this pest can be prevented with the soil drench method imidacloprid, but the annual treatment cost will eventually exceed replacement costs. The Blue Ash is also susceptible to several other pests and diseases and branch breakage can also be a problem in high wind, ice, an snow situations.