The best replacement for azalea is rhododendron.

The best alternatives to azalea are rated as following:
★★★★★  rhododendron
★★  azealia
★  azealia banks
★  camellia
★  hydrangea
★  nicki minaj
★  encore azalea
  azalea banks
  azalia
  fuschia
  gardenia
  rhododendrons

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Speaking about azalea, one probably shouldn't forget about asap rocky.

Other search terms related to azalea and their ratings are:
★★★★★ asap rocky
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Google Trends

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