Collomia biflora is a clump-forming cultivar within the genus Collomia, part of the Polemoniaceae family. This deciduous plant thrives in full sun on a south-facing, sheltered aspect, preferring fertile, well-drained loam soil with a neutral pH. Hardy to UK zone H3, it is suitable for use as a border plant or ground cover. Its season of interest spans spring and summer, and it can be propagated by seed or division.

Collomia biflora thrives in full sun, is hardy to RHS H3, and is perfect as a spring-summer border plant or ground cover.

Collomia biflora

Collomia grandiflora is a western North American annual plant in the phlox family (Polemoniaceae), known by the common names grand collomia, large-flowered mountain trumpet, and large-flowered collomia. It usually appears in sandy habitats and is cultivated as an ornamental. In the wild it grows across North America, Arizona, British Columbia, California, Colorado and other regions. Grow it in full sun and loam soil. In UK gardens it is half-hardy and may need winter protection in colder areas (RHS H3). It works well for border plant and ground cover. It tolerates neutral soils, well-drained conditions and south-facing aspects. Plant in well-drained soil in a suitable position. Water during establishment.