Rhododendron arborescens 'Early'

This is a remarkable early-blooming form of the sweet azalea, Rhododendron arborescens, the tall, hairless-twigged native prized for white summer flowers and an intense heliotrope perfume. Where the species is famous as one of the last azaleas to bloom, carrying fragrant white flowers with showy red stamens well into summer, this selection turns that timing on its head.

The plant comes from a disjunct population that Woodlanders discovered in Aiken County, South Carolina, far from the shrub's mountain and piedmont strongholds. Blooming in April, this form flowers weeks, and sometimes months, ahead of sweet azaleas in the North Carolina piedmont, the southern Appalachians, and western Georgia. That head start makes the selection a botanical curiosity and a genuinely useful garden plant, bringing the sweet azalea's white, red-stamened, heliotrope-scented flowers to the front of the spring season rather than the tail.

In every other respect the shrub is true to the species: a tall, loosely branched deciduous azalea that can rise to eight or ten feet, with smooth, glossy leaves that flush burgundy in autumn and flowers whose slender red stamens arch far beyond the white petals. The genus name Rhododendron means rose tree in Greek, and arborescens is Latin for becoming tree-like. As with all wild azaleas, the plant is grown for beauty and fragrance rather than any edible use; like every Rhododendron, the leaves and nectar contain grayanotoxins and should not be eaten.

Give this early sweet azalea the classic woodland treatment: moist, acidic, well-drained soil that stays cool, shade or semi-shade, and supplemental water through dry spells. Set the shrub toward the back of a shaded border or among high-limbed trees where the April fragrance can drift to a path or a doorway, and pair with ferns, native phlox, and later-blooming azaleas so that one plant opens the season and the next carries it forward. For a collector of native azaleas, an April-flowering sweet azalea is a quiet prize.