Plantera

Plantera is a post-Mechanical Boss that is summoned by breaking a Plantera's Bulb in the Underground Jungle. She is a large plant-like boss that enters combat in two phases, beginning as a closed flower and then opening up and becoming more aggressive after losing half of her health. According to Cenx, Plantera is female.

Plantera moves slowly through terrain by using three long vines to grapple onto solid foreground blocks, much like multi-hooks. In her second phase, she can also latch onto background walls. The ends of her vines, known as Plantera's Hooks, are invincible and deal contact damage, which makes simple trapping ineffective. If she has no surfaces to attach to, she will slowly float upward until she finds something to grab, even rising into Space if needed.

A fight against Plantera is usually easiest in a large, cleared Underground Jungle arena. Widening a Bee Hive is a fast way to make one, though care should be taken around the Larva. Background walls should be removed if possible, since they greatly increase her mobility in the second form. Narrow passages also slow her down, because she takes longer to latch onto nearby terrain.

• Scarab Bombs can speed up arena excavation.
• Living Fire Blocks are effective for lighting the arena because Plantera cannot latch onto them.
• A Gravitation Potion can help avoid Thorn Balls, since they fall to the ground under gravity.
• Another option is to leave a large empty area beneath the arena so Thorn Balls bounce harmlessly below the player.
• Plantera's Bulbs can also spawn in player-made Jungle biomes, which can make finding a fight slightly easier.
• A Hellevator combined with wings can be used to force the fight to begin higher in the Underground Jungle, then let the player glide downward while attacking from range.
• Teleporters make it much easier to escape her attacks and reposition during the fight.

In her second phase, Plantera's ranged offense is limited to Spores, which are easy to destroy. Staying at a distance is therefore an effective way to reduce danger. If the three mechanical bosses were defeated before the Wall of Flesh, the Wall of Flesh still has to be killed to trigger the relevant world progression message. If Plantera is already summoned and another Plantera's Bulb is broken, the bulb is destroyed but no second boss appears.

Plantera has an especially large loot pool for a boss, and she is also notable for being one of the few bosses with a musical instrument drop. Her boss fight theme is heavy metal themed, and it was the first boss battle to have an exclusive music track named after her.