Monardella viminea, commonly known as willowy monardella, is a perennial herb in the mint family, Lamiaceae, endemic to a few narrow drainages in western San Diego County, California. It is specifically adapted to riparian corridors within the coastal sage scrub and chaparral habitats. This plant is federally and state-listed as endangered and is recognized as Critically Imperiled by the California Native Plant Society due to its limited distribution and threats from urban development and invasive species.

Willowy monardella typically grows to a height of 12-18 inches (30-46 cm) with a similar spread. It has narrow, linear leaves and produces clusters of small, tubular, lavender to pink flowers from late spring to early summer, which are highly attractive to native bees and butterflies. The flowers are modest in size but can be quite showy when the plant is in full bloom. In cultivation, willowy monardella is valued for its drought tolerance, fragrant foliage, and the delicate beauty of its flowers. It is used in native plant gardens, as a border plant, and for habitat restoration projects. It prefers well-drained soils, requires little water once established, and thrives in full sun to part shade conditions. While not commonly available in the nursery trade, it can be propagated from seed or cuttings.

Potential problems include root rot if overwatered and habitat loss in the wild. Gardeners should be cautious of overwatering and ensure proper drainage to prevent root rot. As an endangered species, it is important to source plants responsibly to avoid impacting wild populations.CC BY-SA 4.0