Viscaria vulgaris is a perennial in the Caryophyllaceae whose stems are noticeably sticky below the leaf joints. It produces rosy-pink flowers through the summer, flowering from June to August. Native to Eurasia, it prefers well-drained, sandy or loamy soil and suits full sun or partial shade. It is commonly used in borders, rock gardens and wildflower areas.

Sticky catchfly (Viscaria vulgaris) bears rosy-pink flowers from June to August and prefers well-drained, neutral to alkaline soil.

https://en.wikipedia.org/wiki/Viscaria_vulgaris

Viscaria is a genus of flowering plants in the family Caryophyllaceae, native to Canada, Greenland, Iceland, Europe, Kazakhstan, and western Siberia. Molecular studies attempting to resolve relationships in the tribe Sileneae have found that Viscaria is closely genetically related to the genus Atocion, but is quite distinct from it morphologically.

Viscaria vulgaris

Sticky catchfly | Viscaria vulgaris

Viscaria vulgaris 'Splendens Plena' is a perennial notable for its fully double flower heads. It suits full sun or partial shade on a well-drained, moist soil with neutral to alkaline pH and prefers a sheltered spot. Flowering runs June to August. It is used mainly in borders and rock gardens.

Viscaria vulgaris 'Splendens Plena' is a double-flowered perennial that blooms June to August and is suited to sheltered borders and rock gardens.