Toadstool

In-Game Description
"I have never once seen a Lickatoad sit on one of these unpleasant little plants. Sensible Pinata are advised to stay clear of the toadstool all together. The toadstool is almost irresistible to Pinatas - its bright colors mimic candy, and Pinatas tend to be more hungry than clever."

These weeds will entice pinatas to eat them, and get them very sick.