Bathurst burr is an erect, much-branched annual herb, up to 1 m high but usually 30 to 60 cm. Leaves are dark green on the upper surface, a paler green on the under surface, up to 7 cm long and usually three lobed. Stems are branched with one or two three-pronged yellow spines at the base of each leaf stalk. Flowers are creamy green and small, developing into straw-coloured burrs, 1.0 to 1.5 cm long, with numerous yellow hooked spines. Each burr contains two seeds. Of the two seeds present in each burr, only one will germinate in a single season. The other seed will remain dormant for two or three years, sometimes longer.
Controlling Bathurst Burr
For best control of Bathurst Burr use StaraneTM Advanced Herbicide at a rate of 45 mL/ 100 L water and spraying is most effective on young plants and should occur before any burrs are formed to prevent seeding.
Herbicides for control of Bathurst Burr
#Note: Preferred product option in bold. *Consult label for details of growth stage and use, especially where range of rates is given.