Fertilizer

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See also: Crop Growth Calendars

Fertilizer is used to support crop and tree growth and assist in farming. There are three types of crop fertilizer: Fertilizer, Retaining Soil and Speed-Grow. And there is one type of tree fertilizer: Tree Fertilizer. Some (crop) fertilizers are used by placing it on tilled soil before the planted seed sprouts; other types (of crop and tree) fertilizers can be used at any time during plant growth. All crop fertilizers have three tiers (quality grades), but all crop fertilizers affect all crops, including crops grown from Wild Seeds. Tree Fertilizer has one tier.

Mechanics

All fertilizer can be crafted. Recipes for first tier fertilizers are learned once the required level of Farming or Foraging skill is reached. Second tier recipes are learned once the required level of Farming skill is reached. Third tier recipes are purchased on Ginger Island. First and second tier crop fertilizers can also be purchased at Pierre's General Store year-round, or at The Oasis on specific days of the week.

Only one type of fertilizer may be used per soil tile. 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.

Note that crop quality is determined at harvest time and not at planting time, so fertilizer used in the Greenhouse on crops which will mature out of their normal growing season may disappear before harvest and have no effect.

Speed gro affects only the growth and first harvest of a multi-harvest crop. Quality fertilizers (Basic Fertilizer, Quality Fertilizer, and Deluxe Fertilizer) affect all harvests of a multi-harvest crop.

Removing a crop with a Tool like the axe does not remove the fertilizer. A second hit with a tool, such as a Pickaxe is required to remove the fertilizer and make the tile fallow.

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 the seed sprouts Gold.png100g
(Spring 15, Year 1+)
Gold.png2g 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 the seed sprouts Gold.png150g
(Year 2+)
Gold.png10g Sap.png Sap (2)Fish.png Fish (1) 1 Farming Skill Icon.png Farming Level 9
Tree Fertilizer.png
Tree Fertilizer Sprinkle on a wild tree to ensure rapid growth, even in winter. Doesn't work on fruit trees. After planting on tree seeds and saplings N/A Gold.png10g Fiber.png Fiber (5)Stone.png Stone (5) 1 Foraging Skill Icon.png Foraging Level 7
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
(Spring 15, Year 1+)
Gold.png4g 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 Gold.png150g Gold.png200g
(Saturday only)
Gold.png5g Stone.png Stone (3)Clay.png 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.
Note: Does not reduce time between harvests for multi-harvest crops.
Before or after planting Gold.png100g
(Spring 15, Year 1+)
Gold.png20g 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.
Note: Does not reduce time between harvests for multi-harvest crops.
Before or after planting Gold.png150g
(Year 2+)
Gold.png80g
(Thursday only)
Gold.png40g Oak Resin.png Oak Resin (1)Coral.png Coral (1) 5 Farming Skill Icon.png Farming Level 8
Deluxe Fertilizer.png
Deluxe Fertilizer Greatly improves soil quality, increasing your chance to grow quality crops. Mix into tilled soil. Before or after planting Gold.png70g Iridium Bar.png Iridium Bar (1) Sap.png Sap (40) 5 Qi's Walnut Room for Qi Gem.png Qi Gem (20)
Deluxe Retaining Soil.png
Deluxe Retaining Soil This soil has a 100% chance of staying watered overnight. Mix into tilled soil. Before or after planting Gold.png30g Stone.png Stone (5)Fiber.png Fiber (3)Clay.png Clay (1) 1 Island Trader Icon.png Island Trader for Cinder Shard.png Cinder Shard (50)
Hyper Speed-Gro.png
Hyper Speed-Gro Greatly stimulates leaf production. Guaranteed to increase growth rate by at least 33%. Mix into tilled soil. Before or after planting Gold.png70g Radioactive Ore.png Radioactive Ore (1)Bone Fragment.png Bone Fragment (3)Solar Essence.png Solar Essence (1) 1 Qi's Walnut Room for Qi Gem.png Qi Gem (30)

Crop Quality Ratios

Note that quality is determined at the time of harvest, and not at the time of planting. For crops that produce multiples at harvest (i.e., Coffee Bean, Blueberry, Cranberries), Basic, Quality, and Deluxe fertilizers affect only the first crop produced.

For the complete formula, please see Farming.

Normal soil

Farming level % Regular quality % Silver quality % Gold quality Average price
0 97% 2% 1% 1.01
1 91% 6% 3% 1.03
2 85% 10% 5% 1.05
3 80% 13% 7% 1.07
4 75% 16% 9% 1.09
5 69% 20% 11% 1.10
6 64% 23% 13% 1.12
7 60% 25% 15% 1.14
8 55% 28% 17% 1.16
9 50% 31% 19% 1.17
10 46% 33% 21% 1.19
11 42% 35% 23% 1.20
12 38% 37% 25% 1.22
13 34% 39% 27% 1.23
14 30% 41% 29% 1.25

Soil with Basic Fertilizer

Farming level % Regular quality % Silver quality % Gold quality Average price
0 88% 8% 4% 1.04
1 77% 15% 8% 1.08
2 68% 20% 12% 1.11
3 59% 26% 15% 1.14
4 50% 31% 19% 1.17
5 42% 35% 23% 1.20
6 35% 39% 26% 1.23
7 28% 42% 30% 1.25
8 22% 44% 34% 1.28
9 16% 47% 37% 1.30
10 15% 44% 41% 1.32
11 14% 41% 45% 1.33
12 13% 39% 48% 1.34
13 12% 36% 52% 1.35
14 11% 33% 56% 1.36

Soil with Quality Fertilizer

Farming level % Regular quality % Silver quality % Gold quality Average price
0 78% 14% 8% 1.07
1 64% 23% 13% 1.12
2 52% 30% 18% 1.17
3 40% 36% 24% 1.21
4 30% 41% 29% 1.25
5 21% 45% 34% 1.28
6 15% 45% 40% 1.31
7 14% 41% 45% 1.33
8 13% 37% 50% 1.34
9 11% 33% 56% 1.36
10 10% 29% 61% 1.38
11 9% 25% 66% 1.39
12 7% 21% 72% 1.41
13 6% 17% 77% 1.43
14 4% 13% 82% 1.44

Soil with Deluxe Fertilizer

Farming level % Regular quality % Silver quality % Gold quality % Iridium Quality Average price
0 0% 84% 10% 6% 1.32
1 0% 75% 16% 9% 1.36
2 0% 66% 22% 13% 1.40
3 0% 57% 27% 16% 1.44
4 0% 49% 31% 20% 1.47
5 0% 42% 35% 23% 1.51
6 0% 35% 39% 27% 1.55
7 0% 28% 42% 30% 1.58
8 0% 22% 45% 34% 1.61
9 0% 16% 47% 37% 1.64
10 0% 11% 48% 41% 1.67
11 0% 7% 49% 44% 1.70
12 0% 3% 50% 47% 1.73
13 0% 0% 49% 51% 1.76
14 0% 0% 46% 55% 1.77

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
Deluxe Fertilizer.png

Deluxe Fertilizer
Stardew-texture Deluxe Fertilizer.png Stardew-texture Deluxe Fertilizer-w.png
Deluxe Retaining Soil.png

Deluxe Retaining Soil
Stardew-texture Deluxe Retaining Soil.png Stardew-texture Deluxe Retaining Soil-w.png
Hyper Speed-Gro.png

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

Fertilizer Cost

See also: When to turn 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. 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.

Bugs

  • Fertilizer used in a Garden Pot will disappear when harvesting the crop, especially if using seeds other than Wild Seeds.

History

  • 1.4: The number of items per craft now shows in the crafting menu before items are in inventory. Speed-Gro and Deluxe Speed-Gro now have an effect if used after planting.
  • 1.5: Added tier three fertilizers