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All fertilizer can be [[Crafting#Fertilizer|crafted]], once the required level of [[Farming#Farming Skill|Farming skill]] is reached. Fertilizer can also be purchased at [[Pierre's General Store]] year-round, or at [[Oasis|The Oasis]] on specific [[Days of the Week|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 [[crops|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 [[Tools|Tool]] like the [[Pickaxes|Pickaxe]] does not remove the fertilizer. Only one type of fertilizer may be used per soil tile.