Nether Wart is a plant growing in the Nether. It can be found in Nether Fortress around staircases growing on Soul Sand and is the main ingredients for brewing potions and alcohol.
Nether Wart can be planted on Soul Sand where it will grow in around 3 minutes and 30 seconds after 4 different stages.
Due to the presence of an official Minecraft wiki about the Potion Brewing this section will only cover the Alcohol Brewing part.
Nether Wart must be inserted in the low-left space in the Fermenting Barrel in order to start the fermenting process which take a quite long time to end, this result in producing a Fermented alcohol beverage with potions effects relative to the liquid fermented.