Asplenium ruta-muraria
A tiny, tough evergreen spleenwort with bluish-green, finely divided fronds up to about 12 cm long, growing in crevices of limestone and other lime-rich rock and, in Europe, very often in old mortared walls. It is fully frost-hardy across Europe, temperate Asia and eastern North America. It is best grown in a limestone crevice, tufa block or trough outdoors or in a cool alpine house, not as a warm houseplant.
Where it grows wild
Lithophyte of limestone and other calcareous rocks: cliffs, ledges and outcrops, and in Europe commonly lime-mortared masonry and old walls. In North America it favours pockets in well-weathered, fairly dry limestone outcrops. Roots run deep into narrow, alkaline crevices.
From lowland walls near sea level to high mountains; the 56 records with an elevation span 291–1874 m (median 527 m), but the many lowland Dutch and British wall records mostly lack an elevation.
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Profiles are drafts built from measured range and climate and from published sources; each section carries its own confidence in the app.