Jimson Weed is a plant and crafting ingredient in Far Cry 5. It is used for crafting Ultimate Hunter & The Fast in the utility wheel.
You can pick this plant in the wilds. Then open the weapon wheel and hold 
/ 
to craft items with it.
Location:
Found by the road sides, next to structures, and urban sites.
You can find lots of these plants at the following location (Faith’s Region, near Hope County Jail):
Used to Craft:
- Ultimate Hunter – Automatically tag all the animals and enemies in your sight and make predators flee.
- The Fast – Increases your speed for a limited time (2 x Jimson Weed required).
More Far Cry 5 crafting ingredients:
Wanted some more.