Rhododendron 'Polarnacht' (Rhododendron 'Polarnacht') is an evergreen rhododendron prized for its unusually dark bloom color. In late spring, clusters of near-black buds open to frilly, deep purple flowers with red spotting, creating a dramatic look against glossy green foliage. Its dense, compact habit makes it easy to fit into foundation plantings, borders, and small shrub groupings.
Give your plant a site with partial shade, ideally morning sun and afternoon shade or bright filtered light. Plant in moist, well-drained, humus-rich, acidic soil and keep the root zone cool with a generous layer of mulch. Water regularly during establishment, then keep soil evenly moist (not soggy), especially during dry spells. Protect from harsh winter winds and avoid cultivating deeply around the shallow roots.
At maturity it typically reaches about 24-36 inches tall and spreads roughly 60-72 inches wide. After flowering, you can lightly prune or deadhead to shape the plant and encourage strong growth for next year's buds. Feed with an acid-forming fertilizer after bloom if needed, and enjoy year-round structure with standout spring color.