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2 Quart Pot. Cerastium tomentosum, known as snow-in-summer, is a low-growing, mat-forming perennial which is typically massed in sunny locations as a ground cover. Tufts of narrow, gray-green leaves (each to 1″ long and 1/4″ wide) form a 6” tall foliage mat. Leaves are evergreen. In late spring, flower stems rise above the foliage mat (typically to 8-12”) carrying clusters (cymes) of white blooms which form a snow-like carpet (hence the common name).