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Items such as Guano, Manure, Rot, and Rotten Eggs can be used as fertilizers. When placed on the sprout in a Farm, fertilizers will advance its growth. The amount of fertilizer needed to fully grow a newly planted crop depends on the type of Farm and the type of fertilizer.
Guano substitutes 15, one Manure substitutes 10 and one Rot/Rotten Egg substitutes 2.5 daylight hours. Thus Basic Farms need 3 Guano, 4 Manure or 16 Rot / Rotten eggs, and Improved Farms need only 2 Guano, 2 Manure or 8 Rot / Rotten Eggs to fully grow a newly planted crop. Fertilizers do not advance crop growth when it's below 0 degrees in Winter and using a fire to warm the area will not change this.

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A Rotten Egg is produced by allowing an Egg to spoil. Unlike most foods which turn to Rot when they spoil, Eggs become Rotten Eggs. Like Rot, Rotten Eggs can be used to fertilize crops or as fuel in a Campfire or Fire Pit. Rotten Eggs can be used to craft Gunpowder, a powerful explosive which deals a lot of damage and can destroy most structures.

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Rot is produced when Food items (excluding Eggs) are left alone and spoil after a certain time. Rot can be used as Fertilizer for Farming (making crops on Basic Farms and Improved Farms grow faster) and reviving Grass Tufts and Berry Bushes. It will fertilize 1/4 of the amount Manure would and advance growth 1/5 as much as manure would.

Fertilizers are also needed once a Farm loses fertility, which happens after 20-30 uses depending on the type of Farm. When a Farm is depleted it will turn a lighter shade of brown. Guano will rejuvenate a Farm for 12 additional uses, Manure for 10 and Rot or Rotten Eggs will only provide 2.

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Fertilizers are also needed for transplanted plants. Berry Bushes and Grass Tufts that are dug up with a shovel and replanted must be fertilized before they will start to produce again. After a Berry Bush has been harvested for 3-5 times, or a Grass Tuft for 20 times they will require additional fertilizer. Bushes and Grass that grow naturally never need to be fertilised.

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