Crossword Genius

Blue-flowered plant cultivated for the textile fibre made from its stalks (4)

Ross

I believe the answer is:

flax

(Other definitions for flax that I've seen before include "Textile fibre from a blue-flowered plant" , "leaves from it make cloth" , "Blue flowering plant cultivated for its seeds and fibre" , "Plant yielding linen" , "Linen fibres" .)

I've seen this clue in The Guardian.
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