One of my favorite native hydrangeas to use in the landscape is Annabelle Hydrangea (Hydrangea arborescens ‘Annabelle’). It is best grown in morning sun and afternoon shade. The white flowers bloom in late May through June on new growth. Prune it back in the late winter or early spring before the new growth emerges to encourage heavier flowering. After the white flowers fade and begin to dry, they turn a soft green color.
While the flowers and stems are still pliable, I cut and arrange the hydrangeas on a grape vine form to make a beautiful wreath. The blooms will eventually dry to a greenish-ecru color.
When the flowers are totally dry, I spray the wreath with a clear acrylic to help keep the fragile flowers from shattering. Hair spray will also work. Just be sure to spray the acrylic or hair spray out-of-doors. When the spray is completely dry, your wreath is ready hang. If using it outside, be sure to hang it in a place that is protected from the elements.
For more information on growing hydrangeas, see HGIC 1067, Hydrangea.