About Convolvulus cneorum L.
Unlike other species in the Convolvulus genus, Convolvulus cneorum L. is an evergreen shrub rather than a vine. It grows as a low mound, reaching 0.6–1.2 m (2 ft 0 in – 3 ft 11 in) in height, with a matching spread. It produces many pink buds that open into white flowers 2.5–4 cm (1–2 in) in diameter; these flowers are white with a yellow throat. Flowers grow at the ends of stems in loose panicles, and may almost completely cover the plant over a long period from spring through summer. Its leaves are grey-green, covered in fine hairs that give the entire plant a silvery appearance. This species is native to coastal areas of Spain, Italy, Croatia and Albania. In Italy, it occurs along the coast of Tuscany, western Sicily, and on the islands of Capri and Li Galli. In Croatia, it grows on many of the islands off the mainland coast. It is commonly found growing in cracks in rocks. For cultivation, this species prefers alkaline soil, full sun, and good drainage. It tolerates short periods of near-drought conditions, and is cold hardy down to −9 °C. It has earned the Royal Horticultural Society's Award of Garden Merit, a status that was reconfirmed in 2017.
