shrub

Alpenrose

The Story

Plant Bio

Rhododendron ferrugineum, the alpenrose, is a slow-growing, compact evergreen shrub native to the high-altitude, acidic soils of the European mountains. It forms a dense, twiggy mound reaching twenty to sixty inches in height, with dark glossy green leaves that feature distinctive rust-brown scales on their undersides.

Terminal clusters of six to twelve bell-shaped, rose-pink to crimson flowers emerge in summer above the revolute-margined foliage. The young shoots are also covered in the same golden-brown scales that characterize the mature leaf undersides.

Uses & Benefits:

Produces dense terminal clusters of rose-pink to crimson bell-shaped flowers set against glossy evergreen foliage with rusty-scaled undersides.

Serves as an effective, slow-growing ground cover or structural element in specialized acidic rock gardens.

Provides a nectar source for native insects and bees in cool-climate gardens.

Essentials

At a Glance

Plant Type

Shrub

Height

60"

Width

60"

Light

Full Sun, Partial Sun

Zones

4, 5, 6, 7, 8

Water

High moisture, low drought tolerance

Humidity

Prefers cool, moist mountain air

Lifespan

Perennial shrub

Native To

Europe (Alps, Pyrenees, Jura, northern Apennines)

Toxicity

Moderately toxic if ingested

Bloom period

Summer

In flower about 3 months of the year

Planting

How to Grow

Select a site with full sun to partial shade, ensuring protection from intense afternoon heat in warmer regions.
Prepare a highly organic, rich, and strictly acidic soil mix, avoiding any limestone or calcareous materials.
Plant in a location with exceptional drainage to prevent root rot while maintaining consistent moisture.
Apply a thick layer of organic mulch, such as pine bark, to keep the shallow root system cool and damp.

Pro Tip

Prune lightly only immediately after flowering; cutting back hard into old, leafless wood prevents regeneration.

Keep It Thriving

Care Guide

Do

Maintain a cool, organic mulch layer over the roots.
Water regularly to ensure the soil remains evenly moist.
Feed sparingly in early spring with an acidic organic fertilizer.

Don't

Do not cultivate the soil around the shallow root zone.
Do not use heavy chemical salt fertilizers.
Do not plant in alkaline or limestone-heavy soils.
Do not cut back into old, leafless wood.

Seasonal Care Calendar

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

Watch Out For

Pests & Diseases

Common Pests

Common Diseases

In the Garden

Landscape Uses & Companions

Landscape Uses

Rock GardensAlpine GardensAcid-Soil BordersUnderstory Planting

Companion Plants

Kalmia latifolia

Multiply

Propagation Methods

Good to Know

Common Questions

Alpenrose questions

What zones can Alpenrose grow in?

Alpenrose is hardy in USDA Zones 4–8. Inside that range it survives winter in the ground; outside it, grow it as an annual or a container plant you protect.

Is Alpenrose deer resistant?

Yes — Alpenrose is rated deer-resistant. Deer typically pass it over, though extreme hunger can override any plant's defenses.

When does Alpenrose bloom?

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

Does Alpenrose need full sun?

Alpenrose does best in full sun to part shade. In hot climates, afternoon shade keeps blooms fresher longer.