Green mold

Green mold is used to craft the following items:
 * Blue armor dye
 * Blue mutagen
 * Greater blue mutagen
 * Enhanced devil's puffball
 * Green mutagen
 * Greater green mutagen
 * Superior hanged man's venom
 * Hydragenum
 * Nekker pheromones
 * Enhanced relict oil
 * Superior relict oil
 * Rubedo
 * Succubus decoction
 * Turquoise armor dye

This plant is required, along with wolf's aloe leaves and white myrtle petals, for the tattoo removal spell which can be performed by Triss in Chapter I, and Síle or Philippa Eilhart in Chapter II. It can be purchased from the following merchants:
 * Anezka in Lobinden
 * Myron in the Kaedweni camp
 * Marcus in Loc Muinne
 * The Incredible Lockhart in Loc Muinne

Associated quests

 * Hung Over

Green mold grows on walls in damp and dark places, like caves and crypts.