Q: There are several hybrid maple trees being sold at Nurseries. The hybrids are half Silver Maple and half Red Maple. Have any studies been done on the toxicity of these hybrids to horses?
A: All trees in the maple family (Acer species) are considered toxic, including hybrids. However, the toxicity is only associated with wilted maple leaves (i.e. in the fall or after a storm). Assuming your horse has sufficient forage (hay or pasture), ingestion of enough wilted leaves to cause toxicity is unlikely, however, cases have occurred in the fall or during a drought when pasture forage is limited.
By Krishona Martinson, PhD, University of Minnesota