Photo: Cephas, CC BY-SA 4.0 · Wikimedia Commons

Pinkshell Azalea

Rhododendron vaseyi

Also called pink-shell azalea, Azalea vaseyi, Biltia vaseyi.

Wide-open pink flowers on bare spring twigs, from a rare azalea that grows wild only in the mountains of North Carolina.

RareShowy flowersFall colorWildlife value

Type: Shrub
Mature height: 5–15 ft
USDA zones: 4–7
Growth rate: Slow
Sun: Full, Part
Soil moisture: Average
Grows wild in: The Appalachians, rich moist slopes, stream banks and rocky ground
Native range: North Carolina Also recorded in 1 other state, outside its native range. See what is native in your state

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Pinkshell azalea is a rare wild azalea named for G. R. Vasey, who found it on Balsam Mountain in North Carolina in 1878. Its flowers lack the long tube of most azaleas, so the petals look almost separate. Most flowers carry seven stamens rather than five. It does not cross with other rhododendrons. NatureServe ranks it vulnerable, and North Carolina lists it as significantly rare. Digging by nurseries and gardeners is among the threats to it. Plant it at a woodland edge or beside a path, where its flowers on bare twigs catch the eye in early spring.

Size, growth and what to expect

Pinkshell azalea grows slowly, and our growth estimator treats it as slow, about a foot a year. It grows 5 to 15 feet tall and 5 to 10 feet wide, with an open, irregular habit.

Clusters of 5 to 15 flowers open in April and May, before the leaves. Each is 1.5 to 2.25 inches across, pale to deep pink or sometimes white, with orange freckles on the upper petals. The capsules ripen from August to October. In fall the leaves turn red to burgundy where they get some sun.

It grows wild only in the Blue Ridge of North Carolina, above 3,000 feet, from Ashe County south to Transylvania and Macon counties. Some 19 to 48 wild stands and at least 12,500 plants are known. It has escaped into the wild in Massachusetts, possibly from a nursery.

How to grow Pinkshell Azalea

Pinkshell azalea flowers best in part shade or full sun, in moist, acid soil rich in humus that drains well. It will not stand dense clay, so work organic matter into a clay soil before planting. Set plants 6 feet apart and keep them 5 feet from a wall. At its size it can go within 15 feet of overhead wires.

Saplings ship potted. Plant dormant plants in early spring or fall, in a hole three times as wide as the root ball and no deeper. Set the top of the ball a little above grade, and put the native soil back in. Mulch with pine needles or leaves, kept off the stems. It is easy to raise from seed, which it sets freely. The seed is dust-fine and needs light, with no chilling. Sow it in winter on the surface of damp milled sphagnum, uncovered, at room temperature under lights and a clear cover. Seedlings come up in one to three weeks.

Water weekly through the first two summers, since the roots are shallow and it will not stand drought. Rabbits seldom harm it, but cage young plants where deer are common, as for our other wild azaleas. Prune, if at all, right after bloom.

Each flower carries both male and female parts, and bees and butterflies come to the flowers. Sources disagree on whether a native azalea sets seed with its own pollen, so plant two seedlings from different parents for seed. Lace bugs, aphids and mites can mark the leaves, and root rot takes plants in soil that stays wet. Every part of the plant is poisonous if eaten, and honey from its flowers can be too.

Heights and zones are typical ranges for the species in cultivation; local conditions and seed source shift them.

Sources (9)