This mat-forming semi-evergreen tender perennial is native to South Africa where it grows along mountain streams and damp edges of forest clearings. It is a member of the figwort family, Scrophylariaceae, that also includes mullein, butterfly bush, and nemesia. Growing 9-12″ tall from a stoloniferous root system, the fast growing plants have wiry branched stems and small, ovate, pale green leaves that may be hairy or hairless. The pale pink flowers appear in loose terminal racemes from spring until fall and have a broad lower lip with four smaller bonnet-type petals that have dark yellow and maroon translucent markings. Plants are excellent in containers and are also a good choice for borders and rock gardens. The genus name, Diascia, comes from the Greek di meaning two and askos meaning pouch, referring to the two sacs of the type species. The specific epithet, vigilis, is the Latin word for watchful, and refers to a large volcanic rock that is a landmark in the areas where the plant is native.
Type: Semi-evergreen tender perennial
Bloom: Pale pink flowers with maroon and yellow markings on the base of the 4 lower petals
Size: 9-12″ H x 24″ W
Light: Full sun to partial shade
Soil: Fertile, moderately moist, well-drained, slightly acidic; somewhat drought tolerant when established
Hardiness: Zones 8-10; prefers cool temperatures and low humidity,
Care: Pinch to encourage bushiness, deadhead to prolong bloom, cut back when leggy for regrowth; fertilize regularly with balanced fertilizer during the bloom time.
Pests and Diseases: Generally healthy but slugs and snails may cause damage.
Propagation: Seed, semi-ripe cuttings in summer, division
Companion Plants: Pineapple lily, dahlia, Verbena bonariensis
Outstanding Selection: ‘Rupert Lambert” (especially long blooming, 10″ tall)
Karen Meyers