Family: Convolvulaceae

This large genus of twining or trailing, annual or perennial herbs sometimes have a shrubby habit. Many varieties can be as invasive as morning glory (Ipomoea) which it resembles, though Convolvulus is more delicate in appearance, the bell-shaped flowers do not open as wide and the leaves are simpler and smaller. Several species with long-flowering periods are widely grown as groundcovers.

Species

C. cneorum, silverbush, zone 8, is a spreading groundcover, with silky, silver gray leaves and either white or pink flowers.

C. incanus zone 4, is a trailing perennial, growing to 15 cm (6 in), with silvery leaves and blueish white, summer flowers.

C. sabatius (Synonym: C. mauritanicus), zone 9, is a useful, easy-care groundcover, with gray green leaves and lavender blue flowers in spring and summer.

C. tricolor, dwarf morning glory, zone 8, is an annual, growing to 30 cm (12 in). It has rich blue flowers with white feathering and a yellow centre.

Cultivation

Convolvulus enjoys a light, well-drained soil and full or part sun. The trailing species need support or a high position from which the stems can autumn. 'Prim back in winter to avoid it becoming invasive. Sow seed in spring. Propagate perennials and shrubs by cuttings in spring or summer.

Climate

Depends on species; generally, warm to cool temperate; some are frost-tender, others hardy.