Garden shrub with pink or blue flowers (9)

I believe the answer is:

hydrangea

(Other definitions for hydrangea that I've seen before include "Flowering plant - angry head (anag)" , "This flower is strangely a hay danger" , "Garden flower - garden hay (anag)" , "Showy flower" , "Flower you would find in garden hay" .)

I've seen this clue in the Sydney Morning Herald.

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