Nether Wart spawns naturally in the Nether dimension in two main locations:

• Nether Fortresses: Nether Wart grows on Soul Sand in specific rooms or areas within Nether Fortresses, often near stairwells or in dedicated Soul Sand gardens. These rooms are usually inside the fortress, not the open bridge sections. Nether Wart can also be found in chests within Nether Fortresses

• Bastion Remnants: Certain types of Bastion Remnants, particularly the Piglin housing units, have Nether Wart growing on Soul Sand in their central courtyards or bottom center areas. Bastions can spawn in various Nether biomes except basalt deltas

Nether Wart only grows on Soul Sand and has three growth stages. It can be harvested when fully mature to yield multiple Nether Warts, which are essential for brewing potions

. In summary, to find Nether Wart, explore Nether Fortresses and Bastion Remnants in the Nether, focusing on Soul Sand patches within these structures.