Provided here are both underlying theory and recent resultsconcerning the propagation and use of clones in research andin production forestry. State-of-the-art science and casehistories treating production, testing, multiplication anddeployment of clones are presented. Agroforestry, urbanforestry and christmas-tree farming are covered, along withmore traditional multiple-use forestry and high-intensityforestry for biomass, wood and fiber production. Clonalforestry is contrasted to the more recent developments of"family forestry", and the classical tree-improvementapproach relying on seed-orchards. The history of clonalforestry is covered with reviews of several centuriesexperience with Sugi in Japan and poplars in Europe. Theimpacts and use of clones in the contexts of geneticconservation and biodiversity are discussed, as are the lawsand regulations affecting clonal production and deployment.