Rhododendron 'Dark Lord' brings dramatic, near-black buds that open to rich burgundy-red flower trusses in late spring. You will also appreciate the year-round structure of its glossy, dark green, evergreen foliage, which makes it a strong foundation or woodland-edge shrub even when not in bloom.
Give it a spot with filtered sun or partial shade, ideally with protection from harsh afternoon sun and drying winter winds. If you garden in a colder part of its range, sheltering it from winter exposure can improve leaf quality and reduce bud damage. Planting near taller trees or on the north or east side of a building often provides the steady light and wind buffering it prefers.
For best results, plant in organically rich, moist-but-well-drained soil on the acidic side. Work in pine bark fines, leaf mold, or compost to improve drainage and help roots establish. Keep mulch a few inches away from the main stems, and maintain even moisture during the first growing season; deep, regular watering encourages a strong root system. Once established, avoid letting the root zone dry out completely, especially in summer heat.
Expect a mature size of roughly 5-8 feet tall and wide, with the potential to become larger over many years in favorable conditions. Space plants with their future width in mind to allow airflow and reduce stress. Prune only as needed right after flowering to shape or to remove dead or crossing branches. Feed lightly with an acid-forming fertilizer after bloom if your soil is low in organic matter or your plant shows signs of nutrient stress.