This rapidly growing tree can reach a height of 80 feet, with up to a six-foot diameter trunk. Leaves are pinnately compound with 10 to 41 leaflets with smooth leaf margins. When crushed, the leaves and other plant parts have a rancid smell like cat urine or burnt peanut butter.
Foliage is one of the best identifying characteristics for this species. The leaves are pinnately compound and 1-4 feet in length with 10-41 leaflets. Ailanthus altissima resembles native sumac and hickory species, but it is easily distinguished by the glandular, notched base on each leaflet.
Species is dioecious and flowering occurs in early summer when large clusters of yellow flowers develop above the foliage.
Fruit produced on female plants are tan to reddish, single winged and can be wind or water-dispersed.
Ailanthus altissima forms dense, clonal thickets which displace native species and can rapidly invade fields, meadows, and harvested forests. This invasive tree species is extremely tolerant of poor soil conditions and can even grow in cement cracks. Ailanthus altissima is not shade tolerant, but easily invades disturbed forests or forest edges causing habitat damage. Introduced as an ornamental, it was widely planted in cities because of its ability to grow in poor conditions. Management and control efforts for this species continue across the United States at great economic cost.
Although this majestic tall tree is called tree-of-heaven, it is regarded as an invasive species that is capable of displacing native trees, poisoning root systems, damaging sewer lines with its roots, and producing a sap that can cause heart imflammation.
First introduced from its native China into the U. S. in 1751, it has since been planted throughout American cities because it is fast-growing, resistant to pollution, and provides ample shade. However, it is now considered quite invasive.
Forest, forest edges, shrublands, thickets, disturbed areas
Flowering occurs in early summer, when large clusters of yellowish flowers develop above the leaves, Fruit produced on the female trees are tan to reddish, single winged, papery seeds, called samaras. They may remain on the tree throughout late fall.
How You Can Help
Native sumacs and native maples
This species is the preferred host of spotted lanterfly, an invasive insect not yet found in Vermont. Controlling tree-of-heaven could play a role in slowing the lanternfly's advance. Therefore, learning to identify tree-of-heaven is the first step in managing the pest's spread.