Amur corktree invades forest edges and canopy gaps, affects tree regeneration in forests, and displaces native vegetation. Amur corktree are shade-tolerant and can persist in the understory of closed-canopy forests. They have been increasingly found invading disturbed forests across Illinois and the eastern U.S., especially near urban and suburban areas where it has been introduced as an ornamental and street tree. Birds consume the fruits and spread seeds to new areas.

Use alternative native species in landscaping that benefit native wildlife and are not invasive.

How to Control Amur Corktree

• Mechanical: Small seedlings may be hand-pulled, especially in moist soils.
• Chemical:  Always read and follow the herbicide label before initiating treatment. If seeds are present on the plant, take care not to spread them during control.
  • Leaves can be treated with a 5% v/v triclopyr amine or 2% v/v glyphosate solution while actively growing.
  • Basal Bark: For smaller plants less than 4 inches diameter, a basal bark application may be effective. Apply a triclopyr ester formulation at a 20% to 25% v/v rate, mixed with basal oil, to the lowest 15 inches of the stem.
  • Cut Stump: Resprouts vigorously if herbicide is not applied to cut stems. Apply triclopyr amine in water or ester in oil at a 20 to 25% v/v rate or glyphosate at a 50 to 100% v/v rate in water within 10 minutes of cutting.

For more information, explore Management of Invasive Plants and Pests of Illinois.