It reproduces only from seed. Some mature plants survive well into winter, with the result that burrs may be found for most of the year. Image Rosettes The plant flowers from January until autumn, producing up to 150 burrs per plant. Each burr has two cells, with each cell containing one brown, flattened seed about 9 mm long. Seeds are known to remain viable for at least three years.
Dormancy depends on the permeability of the seed coat.
High temperatures break this down. Day length and daytime temperatures may also control germination. . The result is a staggered germination, which makes seedlings difficult to control and allows the plant to exploit the variable environmental conditions under which it grows. What you can do Practice good biosecurity and keep Bathurst burr off your property. Report suspect Bathurst burr or any other unusual weeds to Agriculture Western Australia.