… cause a severe, itchy rash that can last anywhere from 10 to 15 days or longer. Coming into contact with wild parsnip can cause burns, blisters and welts within 48 hours of coming into contact with the plant. The burns from wild parsnip are similar to second-degree sunburns, and … it’s all about prevention and avoidance: Learn how to recognize these plants so you can avoid contact with them. Eastern poison ivy Poison oak Sumac Wild parsnip If entering a wooded or …