Fertilizer

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See also: Crop Growth Calendars

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 affects all crops, including crops grown from Wild Seeds.

All fertilizer can be crafted, once the required level of Farming skill is reached. Fertilizer can also be purchased at Pierre's General Store year-round, or at The Oasis on specific days of the week.

Fertilizer remains in the soil all season. When the season changes, fertilizer normally disappears. However, there are two exceptions in which fertilizer will remain in the soil:

  • If a multi-season crop (i.e., Ancient Fruit, Coffee Bean, Corn, Sunflower, or Wheat) is planted in the fertilized tile, and the new season is one in which the crop grows, the fertilizer will remain.
  • Any crop planted in the greenhouse before its normal growing season will retain its fertilizer if the new season is one in which it normally grows.

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 Gold.png100g Gold.png2g 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 Gold.png150g Gold.png10g Sap (2) Fish (1) 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 Gold.png100g Gold.png4g 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 Gold.png150g Gold.png200g (Saturday only) Gold.png5g Stone (3) Clay (1) 2 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 (see Bug note below) Gold.png100g Gold.png20g Pine Tar (1) 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 (see Bug note below) Gold.png150g Gold.png80g (Thursday only) Gold.png40g Oak Resin (1) Coral (1) 5 Farming Skill Icon.png Farming Level 8

Crop Quality Ratios

Normal soil

Farming level  % Regular quality  % Silver quality  % Gold quality
0 97% 2% 1%
1 91% 6% 3%
2 86% 9% 5%
3 80% 13% 7%
4 75% 16% 9%
5 69% 20% 11%
6 64% 23% 13%
7 60% 25% 15%
8 55% 28% 17%
9 50% 31% 19%
10 46% 33% 21%

Soil with Basic Fertilizer

Farming level  % Regular quality  % Silver quality  % Gold quality
0 87% 9% 4%
1 77% 15% 8%
2 68% 20% 12%
3 59% 26% 15%
4 50% 31% 19%
5 42% 35% 23%
6 35% 39% 26%
7 28% 42% 30%
8 22% 44% 34%
9 16% 47% 37%
10 15% 44% 41%

Soil with Quality Fertilizer

Farming level  % Regular quality  % Silver quality  % Gold quality
0 78% 14% 8%
1 64% 23% 13%
2 52% 30% 18%
3 40% 36% 24%
4 30% 41% 29%
5 20% 46% 34%
6 15% 45% 40%
7 14% 41% 45%
8 12% 38% 50%
9 11% 33% 56%
10 10% 29% 61%

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.png

Basic Fertilizer
Stardew-texture Basic-Fertilizer.png Stardew-texture Basic-Fertilizer-w.png
Quality Fertilizer.png

Quality Fertilizer
Stardew-texture Quality-Fertilizer.png Stardew-texture Quality-Fertilizer-w.png
Basic Retaining Soil.png

Basic Retaining Soil
Stardew-texture Basic-Retaining-Soil.png Stardew-texture Basic-Retaining-Soil-w.png
Quality Retaining Soil.png

Quality Retaining Soil
Stardew-texture Quality-Retaining-Soil.png Stardew-texture Quality-Retaining-Soil-w.png
Speed-Gro.png

Speed-Gro
Stardew-texture Speed-Gro.png Stardew-texture Speed-Gro-w.png
Deluxe Speed-Gro.png

Deluxe Speed-Gro
Stardew-texture Deluxe-Speed-Gro.png Stardew-texture Deluxe-Speed-Gro-w.png

Fertilizer Cost

See also: When to turn your fish into Quality Fertilizer

With the exception of Quality Fertilizer, crafting Fertilizer is always cheaper than purchasing it.

Each time you craft Speed-Gro or Deluxe Speed-Gro, you receive 5 fertilizers, though the "5" does not show up on the crafting menu until you have the required ingredients in inventory. Each time you craft Quality Retaining Soil, you receive 2 fertilizers, though crafting just one would still be cheaper than purchasing it.

The tables below compare the cost of crafting Speed-Gro or Deluxe Speed-Gro against purchasing them at the Oasis or Pierre's. The cost of crafting is the sell price of the constituent ingredients.

Cost for 5 Speed-Gro.png Speed-Gro

Clam.png Clam Quality Crafting Pierre Icon.png Pierre's
No
Profession
Normal Gold.png150g Gold.png500g
Silver Quality.png Silver Gold.png162g
Gold Quality.png Gold Gold.png175g
Iridium Quality.png Iridium Gold.png200g
Tapper Icon.png Tapper
Profession
Normal Gold.png175g
Silver Quality.png Silver Gold.png187g
Gold Quality.png Gold Gold.png200g
Iridium Quality.png Iridium Gold.png225g

Cost for 5 Deluxe Speed-Gro.png Deluxe Speed-Gro

Coral.png Coral Quality Crafting Sandy Icon.png Oasis Pierre Icon.png Pierre's
No
Profession
Normal Gold.png230g Gold.png400g Gold.png750g
Silver Quality.png Silver Gold.png250g
Gold Quality.png Gold Gold.png270g
Iridium Quality.png Iridium Gold.png310g
Tapper Icon.png Tapper
Profession
Normal Gold.png267g
Silver Quality.png Silver Gold.png287g
Gold Quality.png Gold Gold.png307g
Iridium Quality.png Iridium Gold.png347g

Note: Technically it is not possible to find iridium quality clam/coral if you have chosen the Tapper Profession.

Bug

As of PC v1.2.33, applying Speed-Gro or Deluxe Speed-Gro to a crop after planting has no effect on crop growth, even if applied immediately after planting a seed.