Crossword Genius

Tall plant (9)

Ross

I think it could be either:

hollyhock

sunflower

(Other definitions for hollyhock that I've seen before include "Plant with stout, hairy stems and spiky flowers" , "A bloomer" , "Christmas decoration" , "Tall country garden flower" , "blooming great" .)

I've seen this clue in The Daily Mail, The Mirror and The Times.
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