BULL THISTLE

Bull thistle, Cirsium vulgare, is a widespread biennial thistle originally from Europe and Asia. Although it is intimidating in appearance and can sometimes form large infestations, this thistle is not as challenging to control as many others and is mainly a problem in hay fields and pastures. Bull thistle is also commonly found along trails, roads and vacant fields.

Bull Thistle has a high impact in pastures because of the size, spininess and the competitive ability of the plants for moisture and nutrients. The plants physically deter stock from grazing, out compete valuable pasture plants, reduce carrying capacity, may provide harbour for vermin such as rabbits and can contaminate hay (Parsons & Cuthbertson 1992; DPIW 2002). In addition the spines contaminate wool making shearing difficult and degrading the value of the clip (Parsons & Cuthbertson 1992; DPIW 2002). Spear Thistle spines may transmit virus diseases between animals.

 In all states and territories of Australia, however, occurrence in the Northern Territory seems to be limited to the urban area of Alice Springs, and no naturalised populations have as yet been recorded (AVH 2021; Parsons & Cuthbertson 2001; DPI 2007; Hussey et al. 1997).  It can be very common and widespread in areas where it has naturalised. 

Spray FireHawk Bioherbicide Concentrate: 50 mL/L of water. Respray if required