Nether Wart

Nether wart is a fungus harvested from Nether wart crops and is used to plant them. It is an essential ingredient in almost every potion. Unlike other crimson plants, Nether wart doesn't have a warped equivalent, although warped wart blocks exist.
Nether wart crops are found in Nether fortresses and bastion remnants and used to grow Nether wart, which only requires soul sand to grow.