In 1920, Washington planted 507 Norway maples along 16th Street to honor its war dead; the invasive species later spread into Rock Creek Park

In 1920, Washington planted 507 Norway maples along 16th Street to honor its war dead; the invasive species later spread into Rock Creek…

Washington, DC's Norway maple trees, originally planted as a WWI memorial, have become a significant ecological threat, overtaking native species in Rock Creek Park.

Washington planted 507 Norway maples to honour WWI soldiers in 1920, but the trees later spread into Rock Creek Park