Cerastium biebersteinii (Snow-in-Summer)

Cerastium biebersteinii (Snow-in-Summer) is a low-growing herbaceous perennial plant in the family Caryophyllaceae. It is native to the Caucasus Mountains and other areas of western Asia, but it has also been introduced to other parts of the world as an ornamental plant. 

The plant grows to a height of about 10-20 cm (4-8 inches) and spreads to about 30-45 cm (12-18 inches) wide. It forms a dense mat of silver-gray foliage that is covered in small, star-shaped white flowers in the late spring and early summer months.

The plant has silvery-gray foliage that forms a dense mat and small white flowers that bloom in early summer, giving the plant its common name. The flowers are about 1 cm in diameter and have five petals that are deeply notched, giving them a fringed appearance. The flowers are borne in clusters at the ends of branching stems that rise up from the foliage. 

Cerastium biebersteinii is a hardy plant that can tolerate a range of growing conditions, including full sun to partial shade and a variety of soil types. It is often used in rock gardens, as a ground cover, or in mixed borders, and it can also be grown in containers. 

Overall, Cerastium biebersteinii is a beautiful and versatile plant that adds interest and texture to a variety of garden settings.