Springvine is a vine that is native to certain jungle locations, that is currently invasive to the island. The party has found several samples of it, including a farm in a cave on the north side of the island.
Springvine acts as a neurotoxin that causes high amounts of aggression and usually ends with the victim's death. Most animals in jungles avoid this plant except for a couple of species that have developed to be able to consume it. Cooking the vine down cooks out the toxin as well, making it safe to consume. Burning is also a suitable method of getting rid of the vine.