According to the University of Arkansas, yucca plants, including the seeds, are not toxic to humans. The ASPCA states that yucca plants cause vomiting and diarrhea in cats and dogs, and liver disease and photosensitivity in horses.
About this Author
Melody Lee worked as a newspaper reporter, copywriter and editor for 5 years. In addition, she has edited magazine articles and books. Lee holds a degree in landscape design and is a Florida master gardener. She has more than 25 years of gardening experience, which includes working at nurseries and greenhouses.