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Message: [QUOTE="borninansonia, post: 5047254, member: 184"] If poison ivy is like poison oak, dig it up. I had 3 acres of poison oak in my yard, and lots of poison oak outside my yard. Spraying did not help -- it killed the leaves and sprouts that I sprayed, but not the plant because the roots were at least 3' deep and 3" in diameter and went out of my yard. The only method that worked was digging it up. I came to believe that the poison oak plants in my yard were the same plant as the poison oak in a friend's yard 2 miles away. She had to dig it up too. I asked an Oregon State U researcher who responded that poison oak may rival aspen trees for the largest organism in the country. We could not get money to do a DNA analysis. [/QUOTE]