The Rumor Weed is the main antagonist in Larryboy and the Rumor Weed.
She is actually not just one weed, but a whole army of super strong, property-wrecking, rumor spreading weeds, all under the rule of their leader, The Mother Weed.
They were destroyed when Junior Asparagus and Laura Carrot spread nice words about LarryBoy's butler, Alfred, who was being a dangerous robot and having others believe it.
The Weeds are extremely powerful, as normal tools that would normally destroy a weed have no effect on them, and according to Alfred, the Weeds can crumble sidewalks and destroy brick walls. Enough of them spread out in the city that Mayor Blueberry was worried that their property values would plummet, and their homes would be worth nothing. The Weeds' roots went under the ground, in the tunnels and sewers in Bumblyburg, all connected in a hive-mind with The Mother Weed. The Weeds need a lot of energy, but do not photosynthesize. Instead, they feed on rumors themselves.