Poison ivy might be a small plant, but it can cause big trouble—for both your yard and your skin. Its oily sap, called urushiol, is what triggers that itchy rash, and even a tiny amount can cause a ...

Poison ivy tends to hide in plain sight. It grows in wooded areas, climbing its way up the sides of trees. It hides in the weeds on the ground. It spreads quickly, taking over fences and flower beds.