Poison Ivy is infuriated when she reads a story in the Gotham Gazette: "Mayor to "Pave Paradise": Put up Parking Lot." She enlists Harley Quinn's help in breaking into the Mayor's grounds and replacing a bag of run-of-the-mill lawn seed with some of Ivy's personal brand of seeds.
Ivy tells Harley to stay in the car and not move, which she rigidly obeys, even as pigeons begin to land on her. Poison Ivy takes a vine into the Mayor's bedroom, and - having put the guards to sleep and covered the house in vines - pressures him into following up on his campaign promises and vetoing the proposal to build a mega-mall on Gotham's wetlands. Even after he caves and signs the requested form, as one last piece of "assurance," she infects him with plant spores - "Pinocchio Berries" - that will, based on minute changes in his body chemistry, cause a plant to (painfully) grow on his skin whenever he lies.
Back at home, Poison Ivy and Harley Quinn watch triumphantly as the mayor, wearing a large turban on his head, resigns from his position due to a health condition that will no longer allow him to pursue politics.