When it comes to grazing, horses tend to select the tastiest forage available. But that doesn't mean that horses won't try to nibble the less palatable variety of weeds and flowers that might be growing in a field or pasture--and some of these can be harmful to a horse's health.
Some weed and flower species cause problems only rarely because horses are unlikely to consume enough to do real harm or the plants aren't widespread and horses aren't likely to encounter them. Nevertheless, it's good to be aware of the poisonous potential of the weeds and wildflowers in our chart.
Guide to Common Poisonous Weeds & Wildflowers
(The chart is in PDF format which can be viewed with the free Adobe Acrobat Reader program. If the program is not on your computer, please visit www.adobe.com to download your free copy. If you still have trouble opening the PDF file, email your name and fax number to firstname.lastname@example.org.)