Mountain Laurel

Mountain laurel is a slow-growing broadleaf evergreen shrub that typically reaches 4 to 7 feet tall, though older plants can become loose and open-branched, reaching 15 feet. You will find it valued for its distinctive spring flower clusters: five-sided, cup-shaped flowers with ten stamens held under tension that release pollen when insects land on the flower. Flower colors range from pure white to pink and red depending on the cultivar. The foliage is leathery, glossy dark green above and yellowish below, with elliptic leaves held alternately but appearing somewhat whorled. Plants are native to rocky, sandy woodlands from Quebec to Florida and across the Appalachian region, favoring acidic, well-drained soils in partial shade.

Mountain laurel demands acidic soil (pH 4.5 to 5.5) with excellent drainage and does not tolerate heavy clay or wet soils; mulching keeps roots cool and moist. It blooms on old wood, so prune immediately after flowering through early summer to shape without removing next season's flower buds. Watch for physiological shothole and carnation tortrix in the PNW, though documented problems are minimal. All parts of the plant contain andromedotoxin and arbutin and are highly toxic if ingested by people or livestock, particularly concerning for pastoral settings. Cultivars like 'Minuet' and 'Nipmuck' offer refined flower colors and controlled habit within regional trade.