Picture Notes: More Information: Distribution: Crimea (southwestern U.S.S.R.). Synonyms: RHS includes Cerastium bierbersteinii in Cerastium tomentosum. Hardiness Zone: USDA Zones 3-10 (view USDA zone map) Size: 6 in. by indefinite spread Form: Herbaceous perennial. Bark: Stem/Bud: Stems are prostrate and spreading. Leaves: Leaves are linear to lance-shaped, silver-grey, 1-1.5 in. long by 1/5 in. wide and covered with fine, white hairs. Fall Color: Flower: Flowers are white, star-shaped, 5-petaled, notched at the ends, numerous and clustered in loose heads; flowering June to July. Fruit: Fruit are capsules. Uses: Use as groundcover or edging in rock gardens, beds and borders. Use on slopes or rock walls. Use as an underplanting and to choke out weeds. Problems: Culture: Grow in full sun in well-drained soil. Chokes out weeds. Links: Notes: RHS includes Cerastium bierbersteinii in Cerastium tomentosum. RHS spells it as Cerastium biebersteinii. Notes 2: Introduced in Michigan. Notes 3: Cultivars: