It generally is between 0.5 and 1.0 meters tall. Sneezeweed increases with range misuse. Heavy stands of sneezeweed will inhibit the growth of other plants. Livestock An animal may die if it eats small quantities of sneezeweed over a long period. Eating about 1 kg of green sneezeweed leaves daily for 10 days may poison sheep.
Some animals die within a few days after first signs appear.
Others that develop a chronic form of poisoning may live for 2 to 3 weeks. Complete recovery from the poisoning is possible if animals are taken off the plants as soon as the first signs are observed. As soon as signs of poisoning appear, remove all animals from sneezeweed-infested range for 10 to 14 days. Lambs are good indicators as they usually show signs of stiffness before other symptoms appear in older sheep. Lambs left to graze sneezeweed after signs first appear become unthrifty and unprofitable to keep.