Answer: rootstocks

AnswerCrossword Clue
ROOTSTOCKSOrigins.
rootstocksA primary form or source from which offshoots have arisen
rootstocksA rhizome
rootstocksA plant onto which another variety is grafted
rootstocksROOTSTOCK, a rhizome, esp if short, thick, and more or less erect