Fertilizer

Fertilizer is used to produce different effects to support crop growth and improve farming in general (see table below). 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. Removing a crop using the pickaxe does not remove the fertilizer. Fertilizers cannot be stacked (only one type may be used per soil tile). Fertilizer in the greenhouse will disappear after one season, even with crops that are normally cross-season like Corn.

Types of Fertilizer

Image	Name	Description	Pierre's	Oasis	Sell Price	Crafting	Farming Lvl.
	Basic Fertilizer	Improves soil quality a little, increasing your chance to grow quality crops. Mix into tilled soil before planting. (~33% Regular / ~33% Silver / ~33% Gold)	data-sort-value="100">100g		data-sort-value="2">2g	Sap (2)	Lvl. 1
	Quality Fertilizer	Improves soil quality, increasing your chance to grow quality crops. Mix into tilled soil before planting. (~10% Regular / ~30% Silver / ~60% Gold)	data-sort-value="150">150g		data-sort-value="10">10g	Sap (2) Fish	Lvl. 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)	Lvl. 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	data-sort-value="5">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 before or after planting. Does not reduce time between harvests for multi-harvest crops.	data-sort-value="100">100g		data-sort-value="20">20g	Pine Tar (1) Clam (1) (Each craft produces 5 Speed-Gro)	Lvl. 3
	Deluxe Speed-Gro	Stimulates leaf production. Guaranteed to increase growth rate by at least 25%. Mix into tilled soil before or after planting. Does not reduce time between harvests for multi-harvest crops.	data-sort-value="150">150g	data-sort-value="80">80g	data-sort-value="40">40g	Oak Resin (1) Coral (1) (Each craft produces 5 Deluxe Speed-Gro)	Lvl. 8

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 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.

The Speed-Gro and Deluxe Speed-Gro variants are also cheaper to craft than to buy (contrary to earlier suggestions on this wiki page). 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 x 5	Pine Tar (data-sort-value="100">100g) Clam (data-sort-value="50">50g) TOTAL 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 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