Cabbage Tree Flat is a 2,000-hectare sheep and beef operation, part of the Horizon Farming Group for the past six years. Farm Manager Alistair McPhearson has been at the helm since the property joined the group, leading a team of four staff, including a cadet from a local training programme.
The farm runs approximately 17,000 sheep and 1,500 Angus cattle. Located near the coast, the property benefits from consistent year-round grass growth, with frosts typically only affecting small pockets of land.
Under Alistair’s leadership, the focus has been on improving pasture quality and strengthening weed control strategies. Nodding thistle has historically been the biggest weed challenge, previously managed through aerial application of phenoxy herbicides. However, after years of use, there are now signs of reduced efficacy and possible resistance, prompting a shift to alternative control methods.
Until recently, Californian thistles hadn’t been a major concern on the farm. But over the past two seasons, Alistair has observed a noticeable increase in dense patches, particularly in areas treated with a spring application of Tordon™ PastureBoss®. This escalation has made control a growing priority.
Adding to his concern, last year marked the first time Alistair spotted signs of scabby mouth in some lambs—a condition he suspects is linked to increased contact with Californian thistles.
Alistair is now working closely with his local PGG Wrightson representative and Corteva Agriscience to implement a targeted thistle control strategy. His goal: to achieve complete control in problem areas and return the pastures to their full productive potential.
Follow the progress of the 3 Step programme in photos below.
For expert advice on Californian Thistle control or help tailoring this programme to your farm talk to your Corteva Agriscience Territory Manager or your local PGG Wrightson Technical Representative.
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