Sempervivum arachnoideum are native to higher altitudes in Europe. They form rosettes to 3" in diameter with pale green leaves with hairy margins. Often the rosette is obscured with a dense white "cobweb" appearance. Flowers are star-shaped and pink. In the past, Sempervivums were planted on roofs in Europe and it was believed that Semperivivums had the ability to protect the house from lightning strikes or other attacks. Plant Sempervivum in rock or dish gardens or even strawberry pots. They are one of the few succulents that will grow in colder climates. I sent a tray to upstate New York and was happy to find out they all survived winter 2009. They like filtered light with lots of airflow. Prefers shade during summer dormancy. Water thoroughly when soil dries out. Although very cold tolerant, best to provide frost protection to prevent possible scarring.