a facility where trees and shrubs are cultivated for exhibition
"The visitors spent their afternoon wandering through the arboretum, admiring the rare species of oaks that were specifically planted there for public exhibition."
A place where many varieties of tree are grown for research, educational, and ornamental purposes.
"The family spent their afternoon exploring the arboretum, admiring the diverse collection of rare trees cultivated both for scientific study and its beautiful scenery."