Curly dock grows well in alfalfa, disturbed sites, cultivated fields, ditches, and especially in compacted, overgrazed pastures.

Common ragweed is distributed widely across the United States and occurs in pastures and cultivated crops. Infestations in pastures are usually more of a problem during periods of drought or when overgrazing occurs.

Buttercups can be poisonous to horses, but the plants are not palatable and animals usually do not eat them.

Chicory is not as common as many weeds in horse pastures but occurs in more abundance in unmowed pastures.

Poison hemlock is extremely poisonous to horses and humans, however horses rarely eat this plant because of its low palatability.