I have allergies to weeds, grass, and pollen for which I have to get weekly shots but for the past four years a vine in my back yard that wasn't poison ivy caused the worst allergic reaction I've ever had with hives all over my body, eyes swollen shut, have to take steroids injected and pills and after 3 weeks it finally went away. PLEASE be careful! My lawn people finally identified the vine I thought was harmless as virginia creeper and I had no idea anyone was allergic to this until I read all the postings on this web site. Please take this seriously if you have weed allergies and especially if you know you're allergic to poison ivy which I also am. You do NOT want this to ever happen to you.