Sempervivum tectorum

Common Houseleek is a species of flowering plant in the family Crassulaceae, native to the mountains of southern Europe.  It is cultivated in the whole of Europe for its appearance and a Roman tradition claiming that it protects buildings against lightning strikes. The botanical name Sempervivum is Latin for "live forever", which refers to the offsets that are produced and allow that plant to appear to live forever.  

It is easily grown in average, dry to medium moisture, well-drained soils in full sun. It will tolerate some light shade, as well as some afternoon shade in extreme hot climate locations.  It thrives in sandy or gravelly soils and will tolerate poor soils and some drought.  Needs sharp soil drainage to perform well.  Avoid overwatering.  Plants spread by offsets to form colonies. The original rosette is referred to as the Hen, the offsets from that rosette are called the Chick.  Individual rosettes die after bloom and should be removed from the garden at that time.  This plant is moderately salt tolerant.

It is often used in rock gardens, as a border front, in rock crevices, along stone walls, as a small area ground cover, and as an edging or foundations. Makes an excellent container plant.  Try planting them in a rock wall, with the plants tucked into the crevices.  That will provide a good balance of drainage, radiant heat and at the same time will protect the plant's roots.  It's at its best when planted in groups or massed as a ground cover.

Insects, Diseases, and Other Plant Problems:  Overwatering can lead to crown rot, allow plants to dry out between watering. 

VIDEO Created by Elisabeth Meyer for "Houseplants, Succulents, and Cacti", a plant identification course offered in partnership with Longwood Gardens.   

More information on Sempervivum.