Mexican paintbrush ‘Blue Danube’ (Ageratum houstonianum ‘Blue Danube’)

Mexican paintbrush 'Blue Danube' (Ageratum houstonianum 'Blue Danube')
Mexican paintbrush 'Blue Danube' (Ageratum houstonianum 'Blue Danube') - Yoko Nekonomania, CC BY 2.0, via Wikimedia Commons

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