Type of rhododendron grown for its showy flowers of different colours (6)

I believe the answer is:

azalea

(Other definitions for azalea that I've seen before include "Acid-loving plant" , "Flowering shrub akin to rhododendron" , "Rhododendron-type shrub" , "Plant with showy flowers" , "Rhododendron relative" .)

I've seen this clue in The Guardian.

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