The term "Sedum" is taken from the Latin word "sedo" meaning 'to sit'. This probably refers to their generally ground-covering nature and the way they tend 'to sit' on rocks, walls and other seemingly uninviting places. There are about 400 different species of sedum and many cultivars. They vary greatly in height, colour and flower shape, colour and season.
They are very easy care tolerating poor soil and dry locations in full sun or light shade.