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Senecio species, Butterweed, Yellowtop, Birdseed, Chickenweed, Ragwort, Tansy Ragwort


Biennial that grows up to three feet. Stem is smooth and hollow and branches at the top. Leaves are wide, alternate and deeply divided. Flowers are bright yellow and grow in clusters.


Concern Level

Only during drought conditions, unpalatable, can be incorporated into hay.

Toxic Parts

All parts of plant are toxic, however concentrations are highest in the flowers and leaves.


Image from Selso


Lack of appetite, weakness, yawning, lack of coordination, jaundice of mucus membranes, aimless walking and constant chewing motion.


Contains pyrrolizidine alkaloids which can cause liver failure called “walking disease” or “sleepy staggers”. can be fatal.


Image from Thommybe

More Information

Organic Weed Management

*It should be noted that we are not veterinarians. This information is written specifically for horses and should be used for reference purposes only. If you think your horse has eaten something toxic call your vet right away.

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