For all the time I spend digging, planting, pulling and weeding, one would think I’d have some poison ivy horror stories to tell, but I do not. I can’t say for sure whether I’m immune to the rash that tortures so many of my fellow gardeners or if I’ve just been lucky, but one thing is for sure: The plant does pose a serious problem for many who come into contact with it. Botanically known as Toxicodendron radicans, poison ivy contains oily chemical compounds called urushiols in its leaves, stems and roots.