Silverbush

The Silverbush, botanically classified as Convolvulus cneorum and widely referred to as the Silvery Bindweed or Bush Morning Glory, is an exceptionally elegant, compact evergreen shrub belonging to the Convolvulaceae (morning glory) family. Unlike its sprawling, climbing vine cousins, this species forms a neat, mounded woody shrub that shimmers with a brilliant metallic sheen under sunlight. Native to the rugged, sun-bleached limestone cliffs and coastal rocks of the Mediterranean basin—particularly in coastal Spain, Italy, Croatia, Albania, and Greece—it is celebrated for its extreme resilience and premium ornamental appeal in water-wise landscapes.

Growing into a tight, rounded hummock measuring 1.5 to 3 feet in height and spreading 3 feet wide, Convolvulus cneorum is characterized by its magnificent lance-shaped leaves. Each leaf is densely clothed in fine, silky, silver-grey hairs that reflect heat and preserve moisture, giving the entire canopy a unique silvery-white or platinum appearance. From mid-spring through late summer, the shrub produces dense clusters of satin-white, funnel-shaped flowers that measure 1 to 1.5 inches across. The blooms emerge from lovely pink-tinged, spiraled buds and open to reveal a bright, contrasting yellow star-like center.

The reproductive architecture of the Silverbush is represented by the botanical floral formula EBr ⊕ ⚥ K(5) C(5) A5 G(2). This formula indicates that the flowers are ebracteate, radially symmetrical (actinomorphic), and bisexual. The calyx is composed of 5 fused sepals that provide a sturdy, protective base, while the corolla features 5 fused petals that create the characteristic morning-glory-like trumpet or funnel shape. The androecium consists of 5 stamens attached directly to the inner walls of the corolla tube, surrounding a syncarpous gynoecium with 2 fused carpels and a superior ovary that matures into a small capsule.

Convolvulus cneorum is an exceptionally tough xeriscape plant, specifically adapted to thrive in nutrient-poor, rocky, and alkaline soils. It requires full, intense, direct sunlight, needing at least 6 to 8 hours of daily exposure to maintain the dense, reflective silvery hairs on its foliage; shade will cause the plant to grow leggy and lose its metallic luster. It demands superb, sharp soil drainage and is highly susceptible to root rot if planted in heavy clay or kept in soggy conditions. Once established, it requires minimal supplemental water and easily survives USDA hardiness zones 8 through 11.

The genus name Convolvulus is derived from the Latin verb 'convolvere,' which means 'to twine' or 'to wind around,' in reference to the typical vining habit of most species in the family, while the specific epithet cneorum is an ancient Greek term used by Theophrastus for a small, evergreen daphne-like shrub. In regional languages, it is known as Campanilla de plata in Spanish, Liseron argenté in French, and हरिनखुरी (Harinakhuri) in Hindi. Culturally, it is prized as a symbol of serene resilience and structural beauty, bringing dramatic contrast to mixed perennial borders and coastal rockeries.

For families with pets, the Silverbush is a highly recommended and worry-free landscaping addition. Convolvulus cneorum is classified as completely NON-TOXIC to cats, dogs, and horses by leading global veterinary safety groups, including the ASPCA. Its soft, silky leaves do not contain harmful sap or irritating chemical compounds, making it entirely safe for domestic animals to brush against, sniff, or play around in the yard. To learn more about integrating beautiful, drought-tolerant, and pet-friendly shrubs into your garden designs, please explore our Pet Guard catalog.

Silverbush is occasionally confused with other silvery shrubs like Lavender Cotton (Santolina chamaecyparissus) or Olive shrubs. It is easily distinguished because Convolvulus cneorum features soft, silk-textured morning-glory-like white trumpets, whereas Santolina produces yellow button-like composite heads and deeply dissected foliage. It serves as a beautiful accent plant when grown alongside other water-wise specimens; we suggest pairing it with sunny Gazania or low-growing Cigar Flower. To discover more drought-tolerant Mediterranean flowers, visit our Flower Identifier.