Stonecrop (Sedum) is a genus of succulent family (Crassulaceae), with four hundred to five hundred species.
In German, the plants 'Fetthennen' mentioned, presumably derived from hens and chicks, and referring to the easy way of indirectly accountable for multiplication. In English, many species 'Stone Crop' marked.
The species are found throughout the Northern Hemisphere. The plants are succulents that store water in their leaves. The flower usually has five petals, occasionally four or six. There are twice as many stamens as petals.
The plants have adapted metabolism. Carbon dioxide at night stomata acids contained in apple processing. During the day it is available for photosynthesis.
The sharpness of the taste of the apple acidity increases during the day. The stomata in the leaves are like most succulents only open at night, during the hot dry days and loss of moisture to minimize.
Much Sedum species are grown as garden plants for the sake of colorful flowers, the easy cultivation, low necessary care and attractive appearance.
The requirements may be very different: some species are heat-loving and can not stand frost, other species are very frost resistant, but again could not stand a hot climate. The plants are mainly in Germany and some other countries as green roofs.