It's a lovely spring blooming perennial bulb, but it's deadly to horses. Does this grow in your flower garden?

This common garden plant is toxic to humans and pets, including horses. Lily of the Valley is unlikely to be growing in a pasture. It could be accidentally ingested if someone were to throw garden clippings close to a fence line where curious horses might be able to reach. Garden and lawn clippings should be disposed of out of reach of horses.
If you suspect poisoning from any plant or substance call your veterinarian immediately.