"___ Bush" (floral painting by Van Gogh) (5)

I believe the answer is:

lilac

(Other definitions for lilac that I've seen before include "Lavender colour" , "Flower celebrated by Schubert" , "Syringa vulgaris, light purple in colour" , "Fragrant, pale purple flower" , "Pale pinkish-violet" .)

I've seen this clue in The Washington Post.

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