Perennial from the Caryophyllaceae family, Arenaria montana is widespread in southwestern Europe, from the Iberian Peninsula to southern France and northwestern Italy, where it occupies dry lawns, moors, rocky path edges, and clear forest edges on siliceous soils, between 200 and 1,800 meters in altitude.
It forms spreading and loosely spreading tufts, with prostrate to ascending stems, adorned with oval-lanceolate leaves, medium green, slightly hairy and ciliated on the edges. Its creeping and diffuse habit allows it to quickly cover surfaces in rock gardens or walls, which distinctly sets it apart from the hard cushion species of the genus.
Its flowers are among the largest in the genus: immaculately white, with five broadly oval and entire petals, they reach up to 15 to 20 mm in diameter and completely cover the foliage at full bloom, offering a particularly striking effect of vegetal snow. In its natural habitat, flowering extends from April to June. In cultivation, it can start as early as March-April in mild regions.
It thrives in full sun to light semi-shade, in well-drained, acidic to neutral soil, low in limestone. Hardy and vigorous, it is suitable for rock gardens, walls, embankments, and borders, and is well-suited for cultivation in hanging baskets or planters.