If only they had checked first. The same tax dollars that worked to plant trees along 4th Street during the Reconstruction Project a few years back will now be spent to remove them due to their classification as "invasive". The work will begin soon and last for a few weeks. According to information released by the City of Duluth, the 18 Amur Cork trees that they originally spent tax dollars on to plant in the boulevard along the street have now been identified as "invasive". City of Duluth Forrester Clark Christensen explains: "Based on the evidence provided by the Department of Agriculture, the City sees the potential for the male Amur Cork trees to become female which would make them invasive. The City will be removing the Cork trees and replanting a noninvasive tree in its place to remediate this risk".