Plantera's Bulb

Plantera's Bulb is used to spawn Plantera. It can be destroyed using any Pickaxe or a Drill. They spawn in random places in the Underground Jungle after all 3 of the mechanical bosses have been defeated, and the world is in Hardmode. It can be seen on your map if you have already explored the Jungle area, making finding it a bit easier. They will respawn after a while, allowing the player to keep summoning Plantera. 1-6 bulbs can be found underground, depending on how many bosses you kill.