shrub

Hairy Alpenrose

The Story

Plant Bio

Rhododendron hirsutum, the hairy alpenrose, is a compact, evergreen shrub native to the limestone cliffs and subalpine zones of the European Alps. Unlike most members of its genus, this species is a strict calcicole that thrives in alkaline, lime-rich soils rather than acidic peat.

It is distinguished by small, dark green leaves featuring conspicuously bristled margins and scaly undersides. Bright pink, tubular-campanulate flowers emerge in dense terminal clusters of ten or more from late spring through mid-summer.

Uses & Benefits:

Produces dense clusters of bright pink flowers over compact, evergreen foliage, making it ideal for rock gardens.

Thrives in alkaline and calcareous soils where other rhododendron species fail to survive.

Provides nectar for native bees, butterflies, and generalist pollinators during late spring and summer.

Essentials

At a Glance

Plant Type

Shrub

Height

40"

Width

36"

Light

Full Sun, Partial Sun

Zones

4, 5, 6, 7

Water

Moderate

Humidity

Moderate to high

Lifespan

Perennial

Native To

Europe

Toxicity

Highly toxic if ingested

Bloom period

Late spring – Mid-summer

In flower about 3 months of the year

Planting

How to Grow

Select a planting site with full sun to partial shade, ensuring afternoon protection in warmer climates.
Incorporate limestone grit and organic humus into the planting hole to ensure alkaline, free-draining conditions.
Set the plant high in the soil, keeping the root crown slightly above the surrounding grade to prevent waterlogging.
Water regularly to maintain even moisture, especially during dry summer periods, but never allow the soil to become stagnant.

Pro Tip

Never plant this species in standard acidic rhododendron mix; it requires a gritty, alkaline soil and exceptional drainage to prevent fatal root rot.

Keep It Thriving

Care Guide

Do

Grow in lime-rich, alkaline to neutral soils.
Provide immaculate drainage using grit or gravel.
Water consistently to keep the root zone evenly moist.
Prune lightly immediately after flowering finishes.

Don't

Do not plant in heavy, acidic peat soils.
Do not cut back hard into old, leafless bare wood.
Do not allow the soil to dry out completely during summer droughts.
Do not use heavy acidifying fertilizers.

Seasonal Care Calendar

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

Watch Out For

Pests & Diseases

Common Pests

Common Diseases

In the Garden

Landscape Uses & Companions

Landscape Uses

Rock gardensAlpine troughsSubalpine bordersSloped beds

Companion Plants

Daphne mezereum Pinus mugo Gentiana clusii Gypsophila repens

Multiply

Propagation Methods

Good to Know

Common Questions

Hairy Alpenrose questions

What zones can Hairy Alpenrose grow in?

Hairy Alpenrose is hardy in USDA Zones 4–7. Inside that range it survives winter in the ground; outside it, grow it as an annual or a container plant you protect.

Is Hairy Alpenrose deer resistant?

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

When does Hairy Alpenrose bloom?

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

Does Hairy Alpenrose need full sun?

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