Horse owners, watch out for the Amsinckia Intermedia weed (variant sp: Amsinkia intermerdia Common Names: Tarweed & Fiddleneck.) I just read a very informative post on on the blog of Sensation Sport Horses, talking about how this is causing great problems for some horses. The article’s very concise, so if you own a horse, read the article carefully and if you have any concerns, make sure to bring this up with your veterinarian