Ageratum houstonianum Mill.

Annual herb to 70 cm tall. Stems decumbent. Leaves opposite, usually heart-shaped at base, with large glandular dots on underside. Capitula about 7 mm across; summer. Florets usually blue, sometimes white or pink.


This species is available in a wide range of seed mixes and hybrid forms that are mostly dwarf and compact and vary from white to pink, lavender, blue, or bicoloured with white centres.

Source: Jeanes, J. (2002). Asteraceae. In: Spencer, R.. Horticultural Flora of South-eastern Australia. Volume 4. Flowering plants. Dicotyledons. Part 3. The identification of garden and cultivated plants. University of New South Wales Press.

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kingdom Plantae
phylum   Tracheophyta
class    Magnoliopsida
superorder     Asteranae
order      Asterales
family       Asteraceae
genus        Ageratum L.