Green façades are systems in with vines and climbing plants or cascading groundcovers that grow into supporting structures that are purposely designed for their location. Plants growing on green façades are generally rooted in soil beds at the base of the structure, in elevated planters at intermediate levels, or on rooftops. Depending on climate, choice of species, depth of soil bed, orientation, nutrition and irrigation regime, green façades may take several seasons before achieving maturity. Green façades can be attached to existing walls or built as freestanding structures. They are used to shade glazed façades, to provide degrees of privacy and security, to screen or embellish parking structures, patios and walkways, and are built as baffles or fences.