Pacific Rhododendron

(Rhododendron macrophyllum)

Pacific Rhododendron (Rhododendron macrophyllum)

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Estimated Native Range
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Summary

Rhododendron macrophyllum, commonly known as Pacific Rhododendron, is an evergreen shrub native to the coastal forests, woodland margins, and mountainous regions of the Pacific Coast of North America, from British Columbia to central California. It typically grows to a height of 2–9 m (7–30 ft) and is recognized as the state flower of Washington. The Pacific Rhododendron has large, leathery leaves and produces clusters of showy flowers that are 2.8–4 cm (1.1–1.6 in) long, with five lobes on the corolla. The blooms are predominantly pink, but color variants can range from white to dark rose.

This species is valued for its large, attractive foliage and beautiful clusters of flowers that bloom from late spring to early summer. It is often used in woodland gardens, as a foundation plant, or in naturalized areas. The Pacific Rhododendron requires acidic, well-drained soils and benefits from a layer of mulch to maintain soil moisture. While it can tolerate full sun in cooler climates, it prefers part shade, especially in hotter areas. It is important to avoid planting in areas with poor drainage or heavy clay soils to prevent root rot. Regular watering is essential, particularly during dry periods. Potential problems include pests such as vine weevils and diseases like powdery mildew and root rot.CC BY-SA 4.0

Plant Description

  • Plant Type: Shrub
  • Height: 6-25 feet
  • Width: 6-15 feet
  • Growth Rate: Moderate
  • Flower Color: Pink
  • Flowering Season: Spring
  • Leaf Retention: Evergreen

Growth Requirements

  • Sun: Part Shade
  • Water: Medium
  • Drainage: Medium, Slow

Common Uses

Bee Garden, Bird Garden, Border Plant, Butterfly Garden, Fragrant, Hummingbird Garden, Rabbit Resistant, Showy Flowers

Natural Habitat

Native to coastal forests, woodland margins, and mountainous regions of the Pacific Coast of North America

Other Names

Common Names: California Rose Bay, California Rhododendron, California Rosebay, Coast Rhododendron, Western Rhododendron, Big Leaf Rhododendron, Rhododendron À Grandes Feuilles

Scientific Names: , Rhododendron macrophyllum, Rhododendron macrophyllum f. album, Azalea macrophylla, Hymenanthes macrophylla, Hymenanthes macrophylla f. alba, Rhododendron californicum var. washingtonianum, Rhododendron washingtonianum,

GBIF Accepted Name: Rhododendron macrophyllum D.Don ex G.Don