Cattle, sheep and goats have been killed by eating 10 to 20 percent of their body weight in perennial broomweed over 2 weeks.

Do cows eat broomweed?

It is relatively nontoxic when it grows on clay soils. Cattle may abort after eating as little as 20 pounds of fresh broomweed in 7 days. Cattle, sheep and goats have died after eating 10 to 20 percent of their body weight in perennial broomweed over 2 weeks.

What herbicide kills broomweed?

Individual Plant Leaf Spray Method

Works Best: If you have only a few or scattered common broomweed plants to control or when you do not have a ground broadcast sprayer. When to Apply: This treatment works best if used during spring to early summer while the plants are actively growing and before they have matured.