Nether wart is a plant found in the Nether, a dimension in the game Minecraft. It grows in soul sand and is essential for brewing potions. Players can find it in fortress structures, where it often grows in patches. To harvest nether wart, players need to break it, which will yield the item for use. When planted on soul sand, it will grow over time, allowing players to cultivate their own supply. This makes it a valuable resource for creating various potions, enhancing gameplay and strategy.