Ageratum houstonianum, an unassuming little escaped ornamental. Fully spread flowers 7.5 mm (0.3") across.
Ageratum ( /əˈdʒɛrətəm/ A-gé-ra-tum), known as Whiteweed, is a genus of 40 to 60 tropical American herbs, annuals and perennials from the Sunflower family Asteraceae, tribe Eupatorieae.
