FORT WAYNE, Ind. (WOWO): An environmental group is objecting to a tree planted in Fort Wayne as a tribute to the victims of 9/11.

A Callery Pear tree was planted last year, on the 17th anniversary of the terror attacks, at the Fort Wayne Law Enforcement and Firefighters Memorial on Wells Street. The tree is a descendant of one rescued from the wreckage in New York City.

The Sierra Club, however, calls the tree an “invasive species with potential to harm Fort Wayne’s ecosystem,” according to our Partners in News at ABC 21.

The Club sent a letter to city officials asking them to either move the tree indoors where its seeds can’t spread or to spray it every year with an agent that inhibits seed growth.