Poison Ivy was a former villain of the Justice Lords universe.
History
Poison Ivy's history was presumably the same as that of her counterpart from the League's universe, up until the point where the Lords went rogue and Superman lobotomized her.
Poison Ivy now had no signs of her former ambitions, with no care for what happened to the world or it's plants. The Ivy that would attempt to kill someone merely for destroying a single plant was now gone. As a result, she was placed in Arkham Asylum, as it's gardener. She had a brief conversation with the League's Flash when they came to Arkham to rescue Hawkgirl where she revealed that because of her lobotomy, nothing seemed to bother her any more, although she was still weary of the Lord Superman's more lethal tendancies. After that, Flash left to assist the League (who were combating Superman robots in the Asylum) whilst Ivy went back to her routine of clipping roses from the bushes.