certified planting material, budwood, cuttings, or grafted plants which have normally been through a form of quality assurance to ensure trueness to type, freedom from known virus diseases and bacterial diseases, and typically designated clonal origin. Various bodies, often government controlled, offer such certification programmes around the world. See clone, clonal selection, and vine improvement.
© Jancis Robinson and Oxford University Press 1994, 1999, 2006, 2015
