Creeping Charlie, or ground ivy, is toxic, but generally horses must consume large quantities for a reaction to occur.
Hemp dogbane is poisonous to horses. The leaves are toxic at all times, even when dried in haybales.
Wild violet is distributed widely throughout the eastern United States and occurs most frequently in highly maintained pastures, turf grass, and landscapes.
Curly dock grows well in alfalfa, disturbed sites, cultivated fields, ditches, and especially in compacted, overgrazed pastures.
Horsenettle is distributed widely across most of the United States, especially in the eastern half and the western coastal states.
Wild parsnip foliage can cause skin photosensitivity and rashes in both humans and horses.
Horses and other animals rarely consume nimblewill, so the plant often persists in 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.
Musk thistle is distributed across the United States and is listed as noxious in many states.
Animals such as cats, dogs, and horses are not sensitive to poison ivy, but can transfer the irritating urushiol oil to humans.
Perilla mint is toxic to horses and the greatest risk of consumption is in late summer or early fall.
Henbit and purple deadnettle are winter annual species found throughout the eastern United States. These weeds thrive in both cool-season and warm-season forage grasses.
This plant contains toxins that can cause digestive issues, appetite loss, and neurologic problems in horses.
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