Blue- to purple- flowered

Description

Nemesia caerulea is a blue- to purple- flowered herbaceous perennial member of the family Scrophulariaceae. The plant is native to the Cape Floristic Province of southwestern South Africa, where it grows at low elevations on fully exposed north-facing and northwest-facing slopes in association with other native grasses and forbs. Its chromosome number is 2n=18. It produces many small flowers in shades of pink, blue and white (the Latin caerulea means "dark blue"). The flowers are two-lipped, the upper lip with four lobes and the lower lip with two lobes. In cultivation the two lips are often different colours. In temperate regions it is usually grown as an annual. The cultivar 'Sea Mist' has gained the Royal Horticultural Society's Award of Garden Merit. Nemesia is a genus of annuals, perennials and sub-shrubs which are native to sandy coasts or disturbed ground in South Africa. Numerous hybrids have been selected, and the annual cultivars are popular with gardeners as bedding plants. In temperate regions they are usually treated as half-hardy, grown from seed in heat, and planted out after all danger of frost has passed. The flowers are two-lipped, with the upper lip consisting of four lobes and the lower lip two lobes.