Fertilizer

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.

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, 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	Improves soil quality a little, increasing your chance to grow quality crops. Mix into tilled soil.	Before planting	data-sort-value="100">100g		data-sort-value="2">2g	Sap (2)	1	Farming Level 1
	Quality Fertilizer	Improves soil quality, increasing your chance to grow quality crops. Mix into tilled soil.	Before planting	data-sort-value="150">150g		data-sort-value="10">10g	Sap (2) Fish (1)	1	Farming Level 9
	Basic Retaining Soil	This soil has a chance of staying watered overnight. Mix into tilled soil.	Before or after planting	data-sort-value="100">100g		data-sort-value="4">4g	Stone (2)	1	Farming Level 4
	Quality Retaining Soil	This soil has a good chance of staying watered overnight. Mix into tilled soil.	Before or after planting	data-sort-value="150">150g	data-sort-value="200">200g (Saturday only)	data-sort-value="5">5g	Stone (3) Clay (1)	1	Farming Level 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.	Before or after planting	data-sort-value="100">100g		data-sort-value="20">20g	Pine Tar (1) Clam (1)	5	Farming Level 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.	Before or after planting	data-sort-value="150">150g	data-sort-value="80">80g (Thursday only)	data-sort-value="40">40g	Oak Resin (1) Coral (1)	5	Farming Level 8

Quality Crop Ratios

First the game tests if the crop gets gold quality, if it doesn't it tries again with silver quality. If both fail the crop is normal quality.

Soil with quality fertilizer

Farming level	% Regular	% 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%

Soil with basic fertilizer

Farming level	% regular	% 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%

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
Quality Fertilizer
Basic Retaining Soil
Quality Retaining Soil
Speed-Gro
Deluxe Speed-Gro

Tips

Crafting Fertilizer is almost always cheaper than purchasing it. Sap is easy to come by (from cutting Trees and killing Slimes) early in game, so it's a good idea to craft Basic Fertilizer as soon as you reach Farming Level 1. It's also a good idea to craft Crab Pots as soon as you reach Fishing Level 3, to catch Fish and make Quality Fertilizer.

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.

The table below shows the cost benefit of crafting Speed-Gro or Deluxe Speed-Gro rather than purchasing it. The table assumes that Clam and Coral are of normal quality.

Image	Name	Ingredient Sell Price	Price	Savings
	Speed-Gro x 5	Pine Tar (data-sort-value="100">100g) Clam (data-sort-value="50">50g) Total Sell Value = 150g	Pierre's data-sort-value="100">100g (5 packs = 500g)	data-sort-value="350">350g
	Deluxe Speed-Gro x 5	Oak Resin (data-sort-value="150">150g) Coral (data-sort-value="80">80g) Total Sell Value = 230g	Pierre's data-sort-value="150">150g (5 packs = 750g) Oasis data-sort-value="80">80g (Thursday) (5 packs = 400g)	data-sort-value="520">520g data-sort-value="170">170g

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.