Is this material vegetable garden safe? Food grade? Or is it safe for the edges of a vegetable garden

Thank you for your interest! In more than 20 years, we are unaware of any peer-reviewed independent study that has concluded the use of recycled rubber was the cause of any adverse human health issues. The product itself was designed primarily to enhance the curb appeal of landscaped areas. However, if you would like to use it to border a garden, that is perfectly fine as well.