Alder buckthorn (Frangula alnus) is a deciduous shrub native to Europe, Africa, and Asia. Alder buckthorn grows in wet soils in open woodlands and bogs. Commercially, it has been used in the manufacture of gunpowder. Alder buckthorn is considered an invasive species in the United States. I. Appearance and Characteristics Frangula alnus, commonly known as […]