No end of nutrition for wild flower (6)

I believe the answer is:

violet

I'm a little stuck... Click here to teach me more about this clue!

'flower' is the definition.
(I've seen this before)

I can't explain the remainder of the clue.

(Other definitions for violet that I've seen before include "Five-petalled flower" , "A flower for a girl" , "Girl's name - colour" , "Bluish-purple colour as of pretty flower" , "Shade of purple" .)

I've seen this clue in The Independent.

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