Ring-barking is a technique used in bonsai to create new plants from existing ones by interrupting the flow of nutrients from the parent tree to the branch, while allowing the branch to receive nutrients from the parent tree. This stimulates the formation of new roots from the injured part of the branch. Ring-barking involves cutting two parallel slits around the circumference of the branch and removing the ring of bark and cambium layer between them . Ring-barking is also known as girdling. Ring-barking is suitable for species such as Acer, Azaleas, Berberis, Buxus, Chaenomeles, Chamaecyparis, Cotoneasters, Euonymus, Forsythia, Hedera and Wisteria.