what plants are toxic to mules?
According to US Dept of Agriculture the Whitebrush or Beebrush are toxic to mules. Mules, being closely related to horses probably should avoid this list of plants too (which are listed as toxic to horses) # Poison Hemlock # Tansy Ragwort # Field Horsetail # Buttercups # Yew # Oleander # Bracken Fern # St.