Sandwort

Arenaria montana ‘Avalanche’ is an evergreen mountain sandwort that forms a low, spreading cushion of grey-green foliage. Its abundant white, star-shaped flowers appear from late spring into early summer, making the cultivar useful at the front of a sunny, sharply drained planting. ## Landscape Use and Seasonal Interest The [RHS profile](https://www.rhs.org.uk/plants/180984/arenaria-montana-avalanche/details) describes a vigorous evergreen perennial to about 20 cm tall, flowering in late spring and early summer. [Chiltern Seeds](https://www.chilternseeds.co.uk/item_122m_arenaria_montana_avalanche_seeds) identifies the cultivar as compact and spreading, with large white flowers and a subtle yellow throat. Use it in a rock garden, alpine trough, container, or as a small edging groundcover; it can spread gradually in sandy soil. ## Siting and Soil Give it full sun and poor to average soil that drains freely. The RHS notes drought resistance once established; avoid persistently wet conditions. Published hardiness estimates differ, so use local winter performance and drainage when placing it rather than treating a single zone range as universal. ## Maintenance The RHS reports no pruning required. Divide in spring or early fall if a patch needs renewal or propagation, as advised by [Perennials.com](https://www.perennials.com/plants/arenaria-montana-avalanche.html).