The Sourwood is a native tree in East Tennessee. The one that you are viewing at the arboretum was planted in 2017 and is quite small but should grow to 20 ft. or more with a canopy of about the same.!
In East Tennessee and the Smoky Mountains it is well known and held in high regard for the honey that is produced. The honey has is light amber with a caramel spice flavor and finishes with a slight twang.
The tree grows well in acidic soil and makes a great companion tree to its cousins the Azalea and Rhododendron.
Courtesy of USDA-NRCS PLANTS Database / Britton, N.L., and A. Brown. 1913. An illustrated flora of the northern United States, Canada and the British Possessions. 3 vols. Charles Scribner's Sons, New York. Vol. 2: 692.