to poison plants by eating one leaf a year, i do not suggest that. my younger sister ate poison ivy to prove that she was not allergic to it and had a massive reaction. (and truthfully i'm still laughing ten years later.) one person had asked about a five-leaved poison plant, and that is what i have always been told is poison oak. it has overrun my yard, climbed up my pecan trees with vines as thick as my wrists, and no matter how much i do to get rid of it, it comes back over and over again. i am highly allergic to it, i don't even have to 