Petrorhagia saxifraga aka Tunic Flower

Petrorhagia saxifraga, also known as tunic flower or coat flower, is a small herbaceous plant in the family Caryophyllaceae. It is native to Southern and Central Europe, but has been introduced to the United States and Canada, Great Britain, and Sweden. It is a wiry plant with numerous branching stems, narrow leaves, and solitary flowers that grow at the ends of branches. The petals range from pink to white. Tunic flower is commonly cultivated in rock gardens, used along borders, and can escape to grow in lawns, along roadsides, shorelines, and other sandy disturbed areas. Weeds can be removed manually by uprooting or cutting them close to the ground. As a houseplant, Tunic flower is super rare and easy to grow, requiring regular watering and direct light within one foot of a window. The genus and species name refer to its natural habitat: rock crevices. Two subspecies are accepted: Petrorhagia saxifraga subsp. gasparrinii (Guss.) Pignatti ex Greuter & Burdet and Petrorhagia saxifraga subsp. saxifraga (L.) Link.