04/30/2026
Introducing the tree of the week, Tree of Heaven (Alianthus altissima) in the Simaroubaceae or Quassia family. Tree of Heaven is native to Central China and was brought to Europe and the US in the 18th century as a garden specimen. Despite its pleasant-sounding name, this species is one of the most prolific invasives in the United States and is banned from transport, sale, and planting in many states. The tree produces large amounts of seeds that utilize wind dispersal, allowing their aggressive spread and growth. Tree of Heaven also clones through root sprouting, contributing to their invasive status. If it isn’t removed, the Tree of Heaven can reach between 60 and 90 feet in height. The tree contains even or oddly pinnate compound leaves that resemble several Central Wisconsin natives like sumac and mountain ash. The leaves can be differentiated by the rounded serrations occurring at the bottom base of each leaflet. While the tree is the bane of many North American and European forests, it has a variety of uses in Chinese traditional medicine.