A compost potion is one of the quest rewards after completing Garden of Tranquillity, and can be purchased with 5,000 reward points from participating in the Nightmare Zone minigame. Players can use a dose of compost potion on a bucket of compost to make it into supercompost, or use a dose on a full compost bin to obtain 15 buckets of supercomposts instead. Players are advised to use these potions for their own compost bins instead of selling them away, as they will earn more by making buckets of supercompost. Note that the player cannot add a dose of compost potion to compost bins containing a combination of normal compost and supercompost vegetation (in any combination).