ungrafted vine, also known as an own-rooted or self-rooted vine, is a vine which has not been grafted to a rootstock (see grafting). Ungrafted vines grow perfectly well, although some varieties, e.g. sémillon, are known to produce weak root systems, while syrah, for example, produces strong ones. The terms pie franco, pe franco, and franc de pied are occasionally used on labels in Spain, Portugal, and France respectively. See also phylloxera.
© Jancis Robinson and Oxford University Press 1994, 1999, 2006, 2015