Plant 42 is a monstrous, mutated plant located in the Guardhouse. This boss fight can be significantly easier if you prepare correctly.

Location:
- Guardhouse, main research lab.
Attacks:
- Tentacle Slams: Attacks with its large tentacles.
- Poison Spores: Releases a cloud of poisonous spores that can inflict the Poison status.
Strategy (V-JOLT Method - Recommended):
Before entering the boss room, create the V-JOLT chemical in the Guardhouse's chemical mixer (Water + UMB No. 2 + UMB No. 4). Take the V-JOLT to the room directly above Plant 42's roots and pour it in. This will severely weaken the plant. When you enter the boss room, Plant 42 will be much less aggressive and have significantly reduced health. A few Shotgun blasts or Handgun clips will be enough to finish it. If playing as Jill, Barry may assist you with his Magnum, making it even easier.
Strategy (Direct Combat):
If you don't use the V-JOLT, Plant 42 is a formidable foe. Aim for the central bulb. Use your Shotgun or, if playing as Jill, the Grenade Launcher with Flame Rounds (most effective). Dodge its tentacle attacks and avoid the poison spores. Keep moving and fire when you have an opening. This method consumes a lot of ammo and healing items.
Recommended Weapon:
- V-JOLT Method: Shotgun, Handgun.
- Direct Combat: Shotgun, Grenade Launcher (Flame Rounds).
Reward:
- Access to new areas within the Guardhouse, often a key item (e.g., MO Disk).