Are holly trees toxic to horses?

Holly has an array of potential toxicants, but its potential to cause symptoms is quite variable and is highest in fruits when consumed at 0.28% of body weight if fresh and 0.71% if dried. In most instances of intoxication, the signs will be indicative of mild to moderate dysfunction and may include diarrhea, which lasts only a few hours. A lethal outcome is not likely. (From Toxic Plants of North America, Burrows & Tyrl)…

How dangerous is foxglove (Digitalis purpurea) and is it poisonous to horses? Does it tend to spread and become difficult to control?

Foxglove is poisonous to mammals. See the link to the Cornell University Web site at http://www.ansci.cornell.edu/plants/php/plants.php?action=display&ispecies=horses for more information on poisonous plants. You can follow the links in the Cornell reference to the Canadian database as well. There was no information on how much a horse must eat to become sick. It does have to be ingested to make a horse sick. You should consult your veterinarian for more details. All parts of the plant are poisonous. Depending on which …