Answer: rootstock

AnswerCrossword Clue
ROOTSTOCKPlant grafting component
ROOTSTOCKSource; origin.
ROOTSTOCKSource.
ROOTSTOCKType of stem.
rootstockA primary form or source from which offshoots have arisen
rootstockA rhizome
rootstocka rhizome, esp if short, thick, and more or less erect
rootstockA plant onto which another variety is grafted