Arenaria montana, the mountain sandwort,[1] is a species of flowering plant in the family Caryophyllaceae, native to mountainous regions of southwestern Europe, from the Pyrenees to Portugal.

[3] Arenaria montana is an evergreen perennial growing 14–22 cm (6–9 in) tall, with lanceolate or ovate green to grayish-green opposite leaves 10–30 mm (0.4–1.2 in) in length.

From mid to late Spring it produces dense clumps of white to near-white flowers approximately 25 mm (1 in) in diameter borne on cymes of 2 to 10 flowers each.

It also prefers moist soils, as its shallow root system leaves it vulnerable to drought.

[2][5] This plant has gained the Royal Horticultural Society's Award of Garden Merit.