A few species were deliberately introduced to the property over the past century. Some plants are exotics which have escaped cultivation and spread with the help of wild animals and birds and through their own aggressiveness. The Gardens fosters many natural areas on the property. Consequently, as time passes, changes occur. The succession of habitats and representative plants is normal.
Old plants die, and other plants take their place.
Diseases wipe out once established vegetation. Floods periodically change the way the trails look.