Petrorhagia saxifraga, commonly called tunic flower or coat flower, is a spreading mat-forming perennial native to the rocky soils of the Pyrenees and central Europe that has naturalized across eastern North America. This low-growing member of the pink family reaches just 6 to 12 inches tall but spreads 9 to 18 inches wide, producing showy pink flowers from May through August. Hardy in zones 5 to 7, it thrives in full sun and poor, shallow soils where other plants struggle, making it an exceptional choice for rocky gardens and meadow naturalization.
Full Sun
Moderate
5-7
12in H x 18in W
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Moderate
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Tunic flower excels where soil is thin and rocky, conditions that would defeat most perennials. Its shallow root system and grass-like foliage create a dense, attractive groundcover that asks almost nothing of the gardener once established. The plant seeds aggressively and reliably in the landscape, spreading itself into fields and disturbed areas with the kind of determination that turns a single specimen into a naturalized sweep of pink blooms.
Tunic flower serves exceptionally well as a groundcover in rocky or sandy sites and for naturalizing meadow gardens and disturbed areas. Its low stature and spreading habit make it suited to gardens where shallow, poor soil is the reality rather than a problem to solve.
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“Petrorhagia saxifraga originates from the limestone and sandy soils of southern and central Europe, particularly the Pyrenees region and Turkey, where it evolved to thrive in conditions that exclude most competition. Introduced to North America, the species has naturalized over time, particularly in Quebec, Ontario, and throughout the eastern and central United States north of zone 8, where it now grows wild in meadows and disturbed soils as if native to the land.”