shrubN. America Native

Pacific Rhododendron

The Story

Plant Bio

Rhododendron macrophyllum is a large, upright, evergreen shrub native to the Pacific Coast understories, characterized by leathery, dark green leaves up to eight inches long with rolled margins. In spring and early summer, it produces dense terminal trusses of fifteen to thirty funnel-shaped flowers ranging from pale pink to deep rose-purple.

The upper petal lobes feature distinctive greenish-brown or yellowish flecks that contrast against the pink blooms. New foliage emerges in a bright light green to yellowish-green shade, providing a seasonal contrast against the dark, coarse-textured mature canopy.

Uses & Benefits:

Produces large, showy trusses of pink to rose-purple flowers against leathery, evergreen foliage.

Serves as an effective evergreen screen or understory filler in acidic, shady woodland gardens.

Attracts native bumble bees, beneficial insects, and hummingbirds seeking nectar.

Essentials

At a Glance

Plant Type

Shrub

Height

295"

Width

157"

Light

Partial Sun, Shade

Zones

8, 9, 10

Water

Moderate

Humidity

Moderate to high

Lifespan

Long-lived

Native To

North America

Toxicity

Toxic if ingested

Bloom period

Spring – Early summer

In flower about 4 months of the year

Planting

How to Grow

Select a planting site with dappled canopy shade and protection from hot afternoon sun.
Incorporate organic matter such as leaf mold or decomposed forest humus into sandy loam or loamy sand to achieve an acidic pH between 4.0 and 6.2.
Ensure the planting spot has excellent drainage, as waterlogged soils or compacted clay will cause root rot.
Apply a thick layer of organic mulch annually to retain soil moisture and protect the shallow root system.

Pro Tip

Plant in highly drained, acidic soil with dappled shade; planting in heavy clay or full afternoon sun leads rapidly to root rot or leaf scorch.

Keep It Thriving

Care Guide

Do

Mulch annually with an acidifying organic material like leaf mold or aged compost.
Provide regular irrigation during dry summer periods to maintain consistent soil moisture.
Deadhead spent flower trusses immediately after blooming to maintain a clean appearance.

Don't

Do not plant in heavy clay soils or areas prone to standing water.
Do not prune hard into old, leafless wood, as it frequently fails to resprout.
Do not apply heavy synthetic fertilizers high in nitrogen or phosphorus.

Seasonal Care Calendar

Task	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Mulch
Pest Check
Propagate
Prune

Watch Out For

Pests & Diseases

Common Pests

Common Diseases

In the Garden

Landscape Uses & Companions

Landscape Uses

Woodland GardenNative UnderstoryShade BorderCoastal Garden

Companion Plants

Polystichum munitum Vaccinium ovatum Acer circinatum Gaultheria shallon

Multiply

Propagation Methods

Good to Know

Common Questions

Pacific Rhododendron questions

What zones can Pacific Rhododendron grow in?

Pacific Rhododendron is hardy in USDA Zones 8–10. Inside that range it survives winter in the ground; outside it, grow it as an annual or a container plant you protect.

Is Pacific Rhododendron deer resistant?

Not reliably. Deer may browse Pacific Rhododendron, especially tender spring growth — plan on repellents or fencing where pressure is high.

When does Pacific Rhododendron bloom?

Pacific Rhododendron typically blooms in spring through early summer. Exact timing shifts a week or two with your zone — Sow's bloom calendar maps it to your garden.

Does Pacific Rhododendron need full sun?

Pacific Rhododendron does best in part shade.