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Ailanthus is a genus of trees, but the species most often discussed in North American invasive-plant guidance is Ailanthus altissima, commonly called tree-of-heaven. It is a fast-spreading deciduous tree that can form dense stands, damage infrastructure with its roots, and resprout after cutting. Identification and control advice below concerns this species; local rules and product labels govern any treatment.
What is Ailanthus?
Ailanthus is the botanical genus; not every species in it has the same traits or invasive status. This article focuses on Ailanthus altissima, tree-of-heaven. The California Department of Fish and Wildlife describes it as native to northeast and central China and Taiwan. The agency reports its introduction to North America in Philadelphia in 1784, followed by use as an ornamental tree.
California’s agency says tree-of-heaven is now found throughout the continental United States and Hawaii and is reported invasive in more than 30 U.S. states. That is an agency-reported range, not a dated, state-by-state count. The USDA Forest Service describes the species as especially associated with urban and disturbed places and as an early-successional tree.
How to identify tree-of-heaven
Use several traits together rather than relying on a single clue. Tree-of-heaven has large, compound leaves: each leaf is made up of multiple leaflets arranged along a central stem. California’s Department of Fish and Wildlife gives a range of 10–41 leaflets per compound leaf.
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- Leaflet edges and bases: Leaflets are generally smooth-edged, with one or two teeth near the base. UConn Extension describes basal glandular teeth.
- Odor: California’s agency calls the smell “nutty”; UConn Extension notes a strong, offensive odor from crushed plant parts. Because odor descriptions vary, treat it as a supporting clue, not a definitive test.
- Seed production: A female tree may produce up to 325,000 seeds in one year, according to California’s Department of Fish and Wildlife. This is a possible maximum, not a typical yield for every tree.
Tree-of-heaven may be mistaken for sumacs, ash, hickory, black walnut, butternut, or pecan. California’s agency distinguishes those look-alikes by their fully serrated leaflets, unlike the mostly smooth edges and basal teeth of tree-of-heaven. When identification is uncertain, consult a reliable regional guide or local plant expert before removing a tree.
Why tree-of-heaven can be a problem
The species spreads both by seed and by shoots from its roots. Cutting an established tree may therefore leave a root system capable of sending up new stems; seedlings and root shoots can turn a single tree into a persistent patch.
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In riparian areas, California’s Department of Fish and Wildlife reports that dense thickets can crowd native plants and alter physical habitat. The agency also reports that tree-of-heaven releases chemicals that inhibit other plants. Its extensive roots can damage sewer systems and foundations, making the tree a potential concern near built structures as well as natural areas.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.How to manage or remove it
There is no reliable one-cut solution for an established tree. The appropriate method depends on plant size, the site, nearby desirable vegetation, local rules, and whether you can monitor and treat regrowth over time.
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- YEAR-ROUND APPLICATION FLEXIBILITY: With flexible application options throughout the year, this broadleaf herbicide offers versatility for a wide range of conditions. Its ester formulation allows for effective absorption through leaves and roots
- CUSTOM MIX SOLUTION: When used as directed, broadleaf weed killer is tank-mix compatible and works seamlessly with other herbicides, allowing you to customize your treatment plan and tackle even the most stubborn vegetation across diverse landscapes
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Small seedlings and young plants
Minnesota’s Department of Natural Resources says small plants can be dug or pulled. California’s Department of Fish and Wildlife likewise says manual and mechanical removal is effective only for new, small trees and usually must be repeated for several seasons. Remove small plants before they become established, and revisit the area for seedlings or shoots.
Established trees
Established trees are difficult to eradicate. California’s Department of Fish and Wildlife states: “The most effective strategy to remove established plants is with application of herbicide, and even this is not completely successful.” That is an agency assessment, not a guarantee that an herbicide treatment will work at every site.
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Minnesota DNR describes cut-stump approaches using triclopyr-containing products or glyphosate, and basal-stem application using triclopyr ester products. These are examples from Minnesota guidance, not universal directions. UConn Extension also warns that cutting or stump treatment can be followed by root suckering. Follow the current product label and local requirements for the exact product and site; do not infer a mixing rate or treatment schedule from a general article. Herbicides can injure non-target plants.
Plan for follow-up and protect the site
Management is a process, not just the removal of visible stems. The USDA Forest Service describes integrated management as including desirable vegetation and long-term prevention. A practical plan should include monitoring for regrowth and seedlings and consideration of what desirable plants can occupy the cleared area. For an established tree near a foundation, sewer line, sensitive habitat, or valuable landscaping, consider advice from a qualified local arborist or invasive-plant professional before choosing a method.
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Sources and regional guidance
- California Department of Fish and Wildlife: Invasive to Avoid—Tree-of-Heaven
- Minnesota Department of Natural Resources: Tree-of-heaven
- UConn Extension: Tree-of-Heaven
- USDA Forest Service: Tree-of-Heaven review
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