Photo- Univ. of Maryland Extension

Where are they from?

Native to northeast and central China this tree was introduced to Philadelphia in the 1700s and other parts of the United States in the 1850s.

Why are they so harmful?

Tree of Heaven is fast growing and has the ability to withstand poor soils and poor air quality. Trees can disperse up to 300,000 seeds annually and when cut the tree can send up dozens of new stems and more roots. This invasive can choke out and keep other plants from establishing. Besides the impacts to native wildlife Tree of Heaven hurts humans as well. They are a prolific pollen producer, and can also cause skin irritation when in contact with many parts of the tree. People who have contact with the tree should wear protective clothing and avoid contact with all parts of the plant.

How can I identify this tree?

Use identifying apps like Seek by iNaturalist (On both Apple and Google Play stores).

When unable to use phones, remembering what the plant looks like from pictures and descriptions is best. Bark resembles the skin of a cantaloupe and is light gray to brown. Leaves are pinnately compound and can grow up to 4 feet with up to 40 leaflets. Most parts of this plant when crushed or cut gives off a foul odor. Seeds grow up to 2 inches long are twisted clusters.

Where can I learn more?

Information Page by PSU Extension-- https://extension.psu.edu/tree-of-heaven

Accurate Identification by PSU Extension-- https://www.youtube.com/watch?v=vIhyFt2wW9U