Saxifraga crustata is a choice section Ligulatae silver saxifrage that forms dense mats of narrow foliage that is lime encrusted along the leaf margin. It produces 12″ stems of creamy white flowers in summer. A native to the Dolomites where it grows in dolomitic outcroppings. Grow in gritty, well drained neutral to alkaline soil or in tufa in partial shade. Hardy to -10 degrees F.