Silverbell (Halesia tetraptera which is also known as Halesia carolina) is a native tree of the Southeast — especially the Appalachian Mountain region. This research collection was initially planted in 1995 and consists of trees obtained with the aid of the US National Arboretum from four geographic areas (provenances) in Tennessee, North Carolina, West Virginia, and Arkansas. The objectives of the research study are to evaluate the collection for ornamental characteristics, hardiness, and growth rate under Tennessee landscape conditions.

The data being collected includes annual measurements of height and diameter; year when plant first begins flowering; and evaluations of floral characteristics such as size of flowers, color, duration of bloom, and intensity of bloom. Notes are also taken on diseases and insect problems as they occur – no pesticides are being used. Finally, the study will collect data on seed production and the amount of fruiting.

This long-term study is aimed at identifying outstanding trees with potential for landscape use. If such trees are identified, attempts will be made to propagate them.