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PlantSnap
Plant Care
Pacific rhododendron
(Rhododendron macrophyllum)
Also Known As
Pacific rhododendron, Giant rhododendron, Widely leafed rhododendron
About This Plant
Rhododendron macrophyllum is an evergreen shrub that typically grows up to 15 feet (4.5 meters) tall and 10 feet (3 meters) wide. It has large, dark green leaves and produces clusters of pink to purple flowers in the spring.
Plant Care Instructions
Outdoor Size Range
Up to 15 feet (4.5 meters) tall and 10 feet (3 meters) wide.
Light Requirements
Rhododendron macrophyllum prefers partial shade to full sun, but in hotter climates, it should be planted in a location with afternoon shade.
Humidity Needs
It prefers high humidity levels, so it should be planted in a location with good air circulation and misted regularly.
Fertilizing Schedule
It requires regular fertilization with a balanced fertilizer, especially during the growing season.
Pruning Guidelines
Pruning should be done after flowering, and only to shape the plant or remove dead wood.
Common Pests and Diseases
Common pests include aphids, spider mites, and lace bugs. Diseases include powdery mildew and bud blast.
Indoor Size Range
Not suitable for indoor growing.
Watering Schedule
It requires regular watering, especially during hot and dry periods. The soil should be kept moist but not waterlogged.
Temperature Range
It prefers cool temperatures and can tolerate temperatures down to 0°F (-18°C).
Growing Season
The growing season for Rhododendron macrophyllum is from spring to early fall.
Growing Difficulty Level
Rhododendron macrophyllum is moderately difficult to grow, as it requires specific growing conditions and regular maintenance.
USDA Hardiness Zones
Rhododendron macrophyllum is hardy in USDA zones 6 to 9.
Did You Know?
Rhododendron macrophyllum is the state flower of Washington, USA.
