Mexican sunflower (NEMBA Cat 1b) was widely introduced as an ornamental plant but has escaped cultivation and has become highly invasive, particularly along road reserves and disturbed areas. The plant has large, 5 pointed leaves and it is particularly noticeable during its flowering period from April to June when pockets of large bright yellow daisy-like flowers can be seen in abundance.
It is tolerant to heat and drought, grows rapidly and numerous light weight seeds are easily dispersed by wind, water and animals, so it has the ability to quickly form dense stands and outcompete indigenous vegetation.
To eradicate this plant: Small plants can be hand pulled or sprayed with a recommended herbicide. For large plants, cut off at the base and paint the freshly cut stump with a suitable herbicide. Spray any new growth with the recommended herbicide.
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