Rhododendron austrinum ‘Millie Mac’

'Millie Mac' is a wild-selected native azalea from the damp hollows of Escambia County, Alabama, where Floyd McConnell found this plant as a distinctive limb sport on a wild shrub and propagated it for a beauty all its own. Related to the Florida azalea, Rhododendron austrinum, the selection shows white-margined flowers that hint at a touch of R. canescens in the background, and the lineage remains a matter of pleasant debate among native-azalea growers.

The flowers are the marvel. Deep orange-red buds open in early spring, before the leaves, into clear yellow blooms crisply trimmed in white, as if a quiet halo had been drawn around each petal's edge. Held in clusters on bare branches like small lanterns in the cooling woods, the blossoms carry a sweet, honeysuckle fragrance that drifts through the early garden. Few native azaleas offer so unusual a two-toned, white-edged flower.

Behind the novelty stands the deep heritage of the Southern wild azaleas, the bush honeysuckles grown for generations for scent and spring color rather than any use in the kitchen. The genus name Rhododendron means rose tree in Greek, and azalea comes from azaleos, meaning dry. As with every azalea, the shrub is for the eye and the nose alone: all Rhododendron carry grayanotoxins in leaf and nectar and should not be eaten by people or pets.

Hardy from the mid-Atlantic through the Deep South, roughly USDA zones 5 to 9, 'Millie Mac' takes both northern cold and southern heat, settling happily into dappled shade and well-drained, humus-rich soil. Medium-green summer leaves turn a rich red in autumn, adding a late chapter after most native azaleas have faded. Reaching six to ten feet, the shrub belongs in a woodland or native garden where the white-edged spring flowers and fall color can be admired up close. Pair with ferns, native phlox, and other native azaleas. Photos courtesy of In Defense of Plants.