PL. —Androsace alpinaBotanical illustration — drop image
Androsace alpina

Alpine Rock Jasmine

SpringSummer
2a6bHardiness zone
Peak bloom windowZone 6b · frost-offset weeks
Winter
Not in bloom
Spring
Peak bloom
Summer
Not in bloom
Fall
Not in bloom
Peak bloom
In bloom
Background

Androsace alpina is a high-alpine cushion plant endemic to the Alps, native to limestone and dolomite scree between 2,500 and 3,200 meters elevation. In cultivation it suits rock gardens, alpine troughs, and crevice gardens, forming tight mats of small glandular-hairy rosettes that produce tiny pink to white flowers in late spring and early summer.

The cushion growth form is a direct adaptation to harsh alpine conditions — it reduces wind drag, insulates the interior, and the glandular leaf hairs limit water loss. In the garden, perfect drainage is non-negotiable; moisture held at the crown, particularly in winter or wet summers, is the primary cause of failure. A gritty, lime-rich soil mix, an open south-facing site, and a top-dressing of fine gravel around each cushion replicate scree conditions. Growing it at lower altitudes, especially where summers are warm and humid, is genuinely difficult and benefits from overhead protection during prolonged wet periods.

Care guide
SunFull sun
WaterLow
SoilWell-drained, gritty, alkaline
Spacing6–8 in
Height1–2 in
Zone2a – 6b
Frost hardy
Seasonal tasks
winter
sowSurface-sow seeds in a gritty alpine mix and cold-stratify at 2–4°C for 8–12 weeks before moving to cool, bright conditions to germinate.
spring
watchInspect cushions after prolonged wet spring weather for crown rot; improve surface drainage with additional coarse grit around the base.
sowTransplant cold-stratified seedlings or rooted divisions into a prepared gritty, lime-rich rock garden bed or alpine trough.
summer
watchMonitor rosettes for aphid colonies in summer; remove by hand or treat with a dilute insecticidal soap spray directed at the affected cushion.
fall
watchProtect cushions from autumn and winter rain with a pane of glass or open-sided cloche held above the plant to prevent crown rot while maintaining airflow.