At least seven native groups in North America used the plant as a dermatological aid. It could be an ingredient in poultices applied to bruises or sores. A poultice prepared from the roots of cow parsnip was applied to swellings, especially of the feet. The dried stems were used as drinking straws for the old or infirm, or made into flutes for children. An infusion of the flowers can be rubbed on the body to repel flies and mosquitoes. A yellow dye can be made from the roots.