Citrus trees are usually propagated by budding. This is a vegetative propagation method where a bud of a selected variety is inserted into the bark of a rootstock. The bud then grows into a shoot which becomes the scion and the rootstock provides the root system. The use of budding ensures that the new trees have the same characteristics as the parent tree, and also allows for the production of disease-resistant trees. It is a common and effective method of citrus propagation in commercial agriculture.