Arenaria montana, the mountain sandwort, is a species of flowering plant in the family Caryophyllaceae, native to mountainous regions of southwestern Europe, from the Pyrenees to Portugal. The Latin specific epithet montana refers to mountains or coming from mountains.

Description

Arenaria montana is an evergreen perennial growing 14 - 22 cm tall, with lanceolate or ovate green to grayish-green opposite leaves 10 - 30 mm in length. From mid to late Spring it produces dense clumps of white to near-white flowers approximately 25 mm in diameter borne on cymes of 2 to 10 flowers each. Arenaria montana prefers well drained, sandy to sandy loam soils, of moderate (pH 5.5 to 7.5) acidity. It also prefers moist soils, as its shallow root system leaves it vulnerable to drought. This plant has gained the Royal Horticultural Society's Award of Garden Merit.