Rootstock The Plumeria > Rootstock Posted on September 13, 2016November 10, 2022 by PlumeriaDB The portion of a plant used to provide the root system and sometimes the lower part of the stem for a grafted plant. Related Articles: What the Difference Between Cutting, Rooted and Grafted PlumeriaA Guide to Growing Plumeria From SeedWhy GraftGlossary: BuddingGlossary: Interstem, interstock