But in 1980, another expedition to China resulted in the collection of viable seeds of this rare genus. Seeds and cuttings were then distributed by the Arnold Arboretum and the U.S. National Aboretum to several botanical institutions and nurseries. Since that time, the genus has gradually gained popularity. Heptacodium is an outstanding specimen plant. Grown as a small tree or large shrub, its multistemmed habit reaches 15 to 25 feet with a spread of up to 12 feet.
Plants thrive in full sun but have been known to flower and remain healthy in partial shade.
However, in shadier conditions, plants tend to develop a loose, irregular habit. During early May, the glossy leaves emerge and remain attractive throughout the season. In late summer, at a time when few other woody plants are in bloom, creamy white, jasminelike blossoms emerge from the tips of the branches. The blooms are sweetly fragrant and persist for several weeks. To maintain this late-bloomer's attractive shape, Heptacodium must be pruned judiciously during the winter before flower buds have formed.