Sustainable farmer ditches herbicides, uses goats to eradicate noxious weeds WedWednesday 10 Goat farmer Cardia Forsyth surrounded by her herd on her Toms Creek farm. ( Share Print text only Cancel Cardia Forsyth has more than 40 hectares of lush hinterland at Toms Creek, but the property is riddled with invasive plant species that fellow farmers across the country struggle to control. Key points: Goats eat a variety of invasive plant species such as lantana, tobacco bush, and fireweed The weed control method avoids chemical herbicides While many landholders turn to herbicides or to physically pulling out a weed from the root, Ms Forsyth turned to an ancient solution to eradicate the unwanted plants.