On a beautiful fall afternoon in 2009 the students of the Environmental Residential College, led by professors Ned Ladd and Mark Spiro, and together with facilities staff, removed three large Norway maples (Acer platanoides) and planted 20 native trees - 10 eastern redbud (Cercis canadensis) and 10 flowering dogwood (Cornus florida).  Norway maple is an aggressive invasive species that competes for moisture and nutrients in the soil damaging the native flora.  Norway maples quickly re-sprout from the cut stump so the site will need to be continuously monitored for regrowth of these trees.