Fertilizer

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Fertilizer is used to support crop growth and assist in farming. Some fertilizer is used by placing it on tilled soil before placing the respective seeds; other fertilizer can be used after planting a seed, as well as during plant growth.

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. Fertilizer in the greenhouse, however, will disappear after one season, even with crops that are normally cross-season.

Removing a crop with a Tool like the Pickaxe does not remove the fertilizer. Only one type of fertilizer may be used per soil tile.

Types of Fertilizer

Image Name Description When to Use Pierre's Oasis Sell Price Ingredients # Produced per Craft Recipe Source
Basic Fertilizer.png
Basic Fertilizer Improves soil quality a little, increasing your chance to grow quality crops. Mix into tilled soil. Before planting Coin Icon100g Coin Icon2g Sap.png Sap (2) 1 Farming Skill Icon.png Farming Level 1
Quality Fertilizer.png
Quality Fertilizer Improves soil quality, increasing your chance to grow quality crops. Mix into tilled soil. Before planting Coin Icon150g Coin Icon10g Sap.png Sap (2)Fish.png Fish 1 Farming Skill Icon.png Farming Level 9
Basic Retaining Soil.png
Basic Retaining Soil This soil has a chance of staying watered overnight. Mix into tilled soil. Before or after planting Coin Icon100g Coin Icon4g Stone.png Stone (2) 1 Farming Skill Icon.png Farming Level 4
Quality Retaining Soil.png
Quality Retaining Soil This soil has a good chance of staying watered overnight. Mix into tilled soil. Before or after planting Coin Icon150g Coin Icon200g Coin Icon5g Stone.png Stone (3)Clay.png Clay (1) 1 Farming Skill Icon.png Farming Level 7
Speed-Gro.png
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. Before or after planting Coin Icon100g Coin Icon20g Pine Tar.png Pine Tar (1)Clam.png Clam (1) 5 Farming Skill Icon.png Farming Level 3
Deluxe Speed-Gro.png
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. Before or after planting Coin Icon150g Coin Icon80g Coin Icon40g Oak Resin.png Oak Resin (1)Coral.png Coral (1) 5 Farming Skill Icon.png Farming Level 8

Quality Crop Ratios

Assuming level 10 Farming skill, Basic Fertilizer gives an equal chance of obtaining regular, silver, or gold quality crops (≈33% each).

Quality Fertilizer gives the following ratios (again, assuming Level 10 Farming skill): ≈10% Regular / ≈30% Silver / ≈60% Gold.

Appearance

Once used on tilled soil, each type of fertilizer has a unique appearance, allowing you to see what type of fertilizer has been used on a given tile.

Name Unwatered Watered
Basic Fertilizer Stardew-texture Basic-Fertilizer.png Stardew-texture Basic-Fertilizer-w.png
Quality Fertilizer Stardew-texture Quality-Fertilizer.png Stardew-texture Quality-Fertilizer-w.png
Basic Retaining Soil Stardew-texture Basic-Retaining-Soil.png Stardew-texture Basic-Retaining-Soil-w.png
Quality Retaining Soil Stardew-texture Quality-Retaining-Soil.png Stardew-texture Quality-Retaining-Soil-w.png
Speed-Gro Stardew-texture Speed-Gro.png Stardew-texture Speed-Gro-w.png
Deluxe Speed-Gro Stardew-texture Deluxe-Speed-Gro.png Stardew-texture Deluxe-Speed-Gro-w.png

Tips

Crafting Fertilizers is always a better option than buying them, and will save you a lot of money throughout the course of the game.

Sap is very easy to come by (from cutting Trees and killing Slime), so remember to craft Basic Fertilizer as soon as you hit Farming Level 1. It is well worth it.

When you reach Fishing Level 3, a good tip is to craft a number of Crab Pots and place them in the small lakes within your farm + a few by the ocean. Use the caught Perriwinkles, Snails, Shrimps, Mussels and Oysters (classified as Fish) to combine with Sap to make Quality Fertilizer. Easy and cheap.

Speed-Gro and Deluxe Speed-Gro variants are also cheaper to craft than to buy.

For each Pine Tar/Clam combo, you actually get five Speed-Gro packs (1 Pine Tar + 1 Clam = 5 Speed-Gro), which saves both money and resources. Same goes for Deluxe Speed-Gro (1 Oak Resin + 1 Coral = 5 Deluxe Speed-Gro), so get those Tappers up and running.

Image Name Cost Item Price Saving
Speed-Gro.png Speed-Gro x 5

Pine Tar.png Pine Tar (Coin Icon100g) Clam.png Clam (Coin Icon50g) TOTAL VALUE = 150g

Pierre's Coin Icon100g (5 packs = 500g)

Coin Icon350g

Deluxe Speed-Gro.png Deluxe Speed-Gro x 5

Oak Resin.png Oak Resin (Coin Icon150g) Coral.png Coral (Coin Icon80g) TOTAL VALUE = 230g

Pierre's Coin Icon150g (5 packs = 750g)

Oasis Coin Icon80g (Thursday) (5 packs = 400g)

Coin Icon520g

Coin Icon170g