The tuber of this sunflower is used as a root vegetable (9,9)
I believe the answer is:
jerusalem artichoke
(Other definitions for jerusalem artichoke that I've seen before include "Knobbly edible tuber" , "Tuber eaten as a vegetable" .)
I've seen this clue in The Times.
Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free.
Check out my app
or
learn more
about the Crossword Genius project.