From the Latin semper - always and vivum - living. The small green rosettes, often flushed with maroon, are covered in a spider's web of silky white hairs. From this appear stiff flower stems terminated by big flattish clusters of starry usually pink or purplish flowers.
During the Summer, give the plant a good soak whenever it feels dry. Through the Winter keep the compost much drier at all times. Water only when the leaves show signs of shrivelling. It will not tolerate overwatering.
Feed monthly in Summer.
Re-pot when the pot has become overcrowded with rosettes in Spring.
Plant non flowering rosettes individually in a cold frame in Autumn and Spring.
Sempervivums need a spot in full light and will tolerate a wide range of temperatures. Too much water will lead to rot while too much heat and food will cause limp and inappropriate growth.
The rosette which carried the blooms will die off as the blooms fade, but others will grow up to replace it.
During very hot weather, move plant out of the sun's direct rays. Few pests and diseases trouble this plant.
Sempervivum is an admirable plant for ledges in the rock garden, for walls or other hot and dry positions where there is little soil.
This plant needs no additional humidity.
Well drained soil.
Most plant cells look like little boxes full of green disks. The disks are called chloroplasts. Other organelles inside a plant cell include a nucleus (where the DNA is kept), a large central vacuole (where water and other materials are stored) and a complex internal skeleton or cytoskeleton made of various proteins.