With the establishment of the arboretum, tree species and varieties have been added to not only improve the campus aesthetically but also to provide an educational opportunity to its students. Several generations of students have learned to identify tree species and studied plant biology through the use of arboretum specimens. Consequently, the arboretum has become a valuable teaching tool and an educational asset to the university on par with many of its other state-of-the-art facilities.
The arboretum is formally bound to the north by Dearborn Street, to the east by Sixth Street, to the west by Eighth Street, and on the south by Grove Street. It includes over 100 varieties of trees. Today the largest and probably oldest trees on campus are the northern catalpas. One of these grand old trees, which had to be removed recently, was more than 120 years old and was most likely planted sometime around 1882, the year Centenary Hall was built. Centenary Hall is no longer standing, but there are still 14 of these trees with diameters of more than 30 inches