perennialN. America Native

Purple mountain saxifrage

Saxifraga oppositifolia

The Story

Plant Bio

Saxifraga oppositifolia, the purple mountain saxifrage, is a low-growing, cushion-forming evergreen perennial native to circumpolar arctic and alpine regions. It forms dense, trailing mats of woody-based stems covered in tiny, opposite, scale-like leaves that emerge bright green and mature to dark green.

This species is distinguished by its solitary, cup-shaped flowers of deep fuchsia or purple with prominent orange-yellow anthers, which open immediately after snowmelt. The foliage is highly adapted to extreme cold, surviving temperatures below -40°C under snow cover.

Uses & Benefits:

Produces a dense mat of dark green, scale-like foliage covered in vibrant magenta flowers in early spring.

Excellent for stabilizing gritty soils in specialized alpine troughs and vertical rock crevices.

Provides an early source of nectar for specialized alpine insects and bumblebees emerging after snowmelt.

Essentials

At a Glance

Plant Type

Perennial

Height

Width

12"

Light

Full Sun, Partial Sun

Zones

4, 5, 6, 7

Water

Moderate

Humidity

Low

Lifespan

Perennial

Native To

Circumpolar Arctic and alpine zones of the Northern Hemisphere

Toxicity

Non-toxic

Bloom period

Spring

In flower about 3 months of the year

Planting

How to Grow

Select a planting site in full sun to partial shade with cool light exposure, avoiding hot afternoon sun.
Prepare a planting medium consisting of gravelly, mineral-rich scree or gritty, neutral-to-alkaline stony loam.
Position the plant in a raised bed, trough, or rock crevice to facilitate immediate vertical drainage away from the crown.
Water moderately during the active spring growing season to mimic melting snow, then reduce moisture significantly during winter.

Pro Tip

Plant in pure mineral scree or vertical rock crevices to ensure rapid drainage away from the crown, as stagnant winter moisture causes fatal root rot.

Keep It Thriving

Care Guide

Do

Grow in pure mineral scree or rock crevices.
Ensure flawless drainage around the collar of the plant.
Provide cool light exposure and protection from baking summer heat.
Clear away dead flower stems gently after blooming.

Don't

Do not plant in rich, organic, moisture-retaining garden loam.
Do not cut back into old, leafless woody stems.
Do not over-fertilize, as it requires extremely lean conditions.
Do not allow standing water or winter wetness around the crown.

Seasonal Care Calendar

Task	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Pest Check
Propagate
Spring Cleanup
Winter Prep

Watch Out For

Pests & Diseases

Common Pests

Common Diseases

In the Garden

Landscape Uses & Companions

Landscape Uses

Alpine troughsRock gardensScree bedsCrevice gardens

Companion Plants

Eritrichium nanum Phlox diffusa Gentiana vernaAndrosace alpina

Multiply

Propagation Methods

Good to Know

Common Questions

Purple mountain saxifrage questions

What zones can Purple mountain saxifrage grow in?

Purple mountain saxifrage 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 Purple mountain saxifrage deer resistant?

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

When does Purple mountain saxifrage bloom?

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

Does Purple mountain saxifrage need full sun?

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