Cerastium semidecandrum, commonly known as Little Mouse-ear, is an annual herb native to a variety of habitats in Europe, Asia, and North Africa, including open fields, grasslands, and disturbed sites such as arable land, gardens, and roadsides. It is a low-growing plant, typically reaching 0.1-0.5 feet (0.03-0.2 meters) in both height and width, with a mat-forming habit. The plant features small, ovate leaves and bears white, star-shaped flowers with five notched petals and prominent stamens, blooming profusely in the spring and early summer. The flowers are modest in size but can be quite numerous, creating a delicate carpet of white.

Little Mouse-ear is appreciated for its ability to fill in bare spots in the garden and its ease of care. It is often used as a ground cover or in rock gardens due to its low stature and spreading nature. It thrives in full sun but can tolerate partial shade, and it prefers medium or fast-draining soils, including clay, loam, or sandy types. While it requires medium amounts of water, it is relatively drought-tolerant once established. Gardeners should be aware that Cerastium semidecandrum can self-seed and spread, potentially becoming invasive in some regions. It is advisable to check local guidelines before planting to prevent unwanted spread.CC BY-SA 4.0