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Fertiliser is a potion that, when poured on soil, causes plants to grow faster. Phials of it are sometimes found hidden in the Forbidden Forest, one of which had a path leading to it marked with a particular type of red mushroom. Brewing it requires dragon dung, bones, plimpy eyes, and dried kelp.
- Crush dragon dung in pestle, add to cauldron and stir clockwise until potion turns blue.
- Crush bones with hammer, add to cauldron and stir anti-clockwise until potion turns yellow.
- Crush plimpy eyes in pestle, add to cauldron and stir clockwise until potion turns red.
- Slice kelp with knife, add to cauldron and stir anti-clockwise until potion turns green.
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