Sandwart (Arenaria)

Arenaria is a large and variable genus in the pink family (Caryophyllaceae), commonly called sandworts. Its species range from small annual herbs to perennial herbs and subshrubs, with forms that may be prostrate, tufted, cushion-like, or mat-forming. Because this catalog entry identifies only the genus, its exact foliage, flowering season, mature size, and growing requirements depend on the species represented. ## Landscape Use and Seasonal Interest Some sandworts are used in rock gardens and other small-scale plantings, but those uses should be matched to the identified species rather than assumed for every member of the genus. Kew’s genus account describes small herbs or subshrubs with leaves from ovate to linear and flowers usually with five parts; petals may be white or pink. The genus spans temperate and subarctic regions as well as warmer mountain habitats, so hardiness and water needs vary substantially. ## Siting and Soil Confirm the species and its local growing guidance before choosing exposure, soil drainage, irrigation, or spacing. A species-level profile is needed before assigning more precise care or seasonal attributes. ## Maintenance Follow care recommendations for the identified species and growing region. Avoid applying one watering or pruning schedule to the genus as a whole. [Kew Plants of the World Online](https://powo.science.kew.org/taxon/urn:lsid:ipni.org:names:329928-2/general-information) summarizes the genus, while [Flora NSW](https://plantnet.rbgsyd.nsw.gov.au/cgi-bin/NSWfl.pl?constat=&dist=&lvl=gn&name=Arenaria&page=nswfl&showsyn=) documents its broad distribution and family placement.