It is not safe to use railroad ties, as they are typically treated with creosote to preserve them, which can leach into your vegetable garden's soil. Creosote is made up of up to 10,000 chemicals, according to Garden Simply. It can cause various maladies, such as skin irritations, internal pain and cancer, according to the U.S. Agency for Toxic Substances and Disease Registry.
About the Author
Joshua Duvauchelle is a certified personal trainer and health journalist, relationships expert and gardening specialist. His articles and advice have appeared in dozens of magazines, including exercise workouts in Shape, relationship guides for Alive and lifestyle tips for Lifehacker. In his spare time, he enjoys yoga and urban patio gardening.