09/03/2026
The next time you hike our Von Ahn trail you may notice small trees along the field that have bright blue slashes in their trunks. These are invasive Amur cork trees, which have been spreading rapidly on Von Ahn, outcompeting native trees and providing little to no ecological benefit. Our stewardship staff headed out yesterday to implement the recommended management strategy for Amur cork trees: a method called hack-and-squirt where we apply herbicide to slashes in the tree, killing the tree and preventing root suckering. We use bright blue dye to indicate which trees have been treated. We plan to replace those invasive trees with natives to provide shade over the trail and habitat and nutrition for wildlife!
If you have any questions, feel free to reach out to our office or check out the Native & Invasive Plants resource page on our website.