Fertilizer is used to produce different effects to support crop growth and improve farming in general (see table below). All fertilizer is used by placing it on tilled soil BEFORE placing the respective seeds. Fertilizer remains in the soil all season. When the season changes fertilizer normally disappears, however if a cross-season crop like Corn is fertilized the fertilizer will remain in the soil and continue to provide benefits. Removing a crop using the pickaxe does not remove the fertilizer. Fertilizers cannot be stacked (only one type may be used per soil tile).

Types of Fertilizer

Image Name Description Pierre's Sell Price Crafting Farming Lvl.
  Basic Fertilizer Improves soil quality a little, increasing your chance to grow quality crops. Mix into tilled soil. (~33% Regular / ~33% Silver / ~33% Gold)

100g

2g

  Sap (2)

Lvl. 1

  Quality Fertilizer Improves soil quality, increasing your chance to grow quality crops. Mix into tilled soil. (~10% Regular / ~30% Silver / ~60% Gold)

150g

10g

  Sap (2)   Fish

Lvl. 9

  Basic Retaining Soil This soil has a chance of staying watered overnight. Mix into tilled soil.

100g

4g

  Stone (2)

Lvl. 4

  Quality Retaining Soil This soil has a good chance of staying watered overnight. Mix into tilled soil.

150g

5g

  Stone (3)   Clay (1)

Lvl. 7

  Speed-Gro Stimulates leaf production. Guaranteed to increase growth rate by at least 10%. Mix into tilled soil. Does not reduce time between harvests for multi-harvest crops.

100g

20g

  Pine Tar (1)   Clam (1)

Lvl. 3

  Deluxe Speed-Gro Stimulates leaf production. Guaranteed to increase growth rate by at least 25%. Mix into tilled soil. Does not reduce time between harvests for multi-harvest crops.

150g

40g

  Oak Resin (1)   Coral (1)

Lvl. 8