Think fertilizer is a gold sink for people who like clicking on dirt? Think again. Fertilizer is one of the cheapest upgrades in Stardew Valley, and in version 1.6 several recipes changed, so a lot of what you remember from older saves is out of date.
Let me break this down for you: there are four families of fertilizer, each solves a different problem, and the right pick depends on the crop in the ground.
The Four Fertilizer Families
- Quality fertilizers: Raise the chance of silver, gold and iridium star crops. Higher quality means a higher sell price for the same seed.
- Retaining soils: Give the tile a chance to stay watered overnight. The deluxe version keeps it watered every night.
- Speed-Gro: Makes crops grow faster, which can squeeze an extra harvest out of a season.
- Tree Fertilizer: Makes wild trees grow quickly, even in winter. It does nothing for fruit trees.
One rule covers all of them: one fertilizer per tile. You cannot stack Speed-Gro on top of Quality Fertilizer, so every tile is a choice.
Every Fertilizer, Recipe and Shop Price
| Fertilizer | Effect | Recipe (unlock) | Shop |
|---|---|---|---|
| Basic Fertilizer | Small quality boost | 2 Sap makes 1 (Farming 1) | Pierre, 100g from Spring 15 |
| Quality Fertilizer | Bigger quality boost | 4 Sap + 1 Fish makes 2 (Farming 9) | Pierre, 150g from Year 2 |
| Deluxe Fertilizer | Best quality boost, no regular quality crops | 1 Iridium Bar + 40 Sap makes 5 (Qi’s Walnut Room) | None |
| Basic Retaining Soil | Chance to stay watered | 2 Stone makes 1 (Farming 4) | Pierre, 100g from Spring 15 |
| Quality Retaining Soil | Better chance to stay watered | 3 Stone + 1 Clay makes 2 (Farming 7) | Pierre, 150g from Year 2 |
| Deluxe Retaining Soil | Always stays watered | 5 Stone + 3 Fiber + 1 Clay (Island Trader recipe) | None |
| Speed-Gro | At least 10% faster growth | 1 Pine Tar + 5 Moss makes 5 (Farming 3) | Pierre, 100g from Spring 15 |
| Deluxe Speed-Gro | At least 25% faster growth | 1 Oak Resin + 5 Bone Fragments makes 5 (Farming 8) | Pierre, 150g from Year 2; Oasis on Thursdays |
| Hyper Speed-Gro | At least 33% faster growth | 1 Radioactive Ore + 3 Bone Fragments + 1 Solar Essence (Qi’s Walnut Room) | None |
| Tree Fertilizer | Fast wild tree growth, works in winter | 5 Fiber + 5 Stone (Foraging 7) | None |
Plot twist: the 1.6 Speed-Gro recipes are way friendlier than the old ones. Moss grows on older trees around your farm and Bone Fragments are easy to farm at the Ginger Island Dig Site, so you no longer need a beach full of Clams and Coral to keep your fields fast.
Quality Fertilizer: When the Stars Matter
Quality fertilizers raise your odds of better star crops. Silver sells for 25% more than regular, gold for 50% more, and iridium for double. The fertilizer costs the same no matter what you plant, so the return scales with the crop’s base price.
The Math: a quality boost on a cheap crop barely moves the needle. On Starfruit, Ancient Fruit or Melons, a gold star is real money. Put your best quality fertilizer under your most expensive crops and do not waste it on Parsnips once you are past week one.
Two details that are easy to miss. Quality fertilizer applies to every harvest of a multi-harvest crop, which makes it great on Blueberries and Cranberries. And crops that drop several items per harvest only upgrade one of them, so the boost is weaker there.
Deluxe Fertilizer and the Walnut Room
Deluxe Fertilizer is the endgame pick: with it, regular quality crops simply stop showing up. The recipe sits in Qi’s Walnut Room on Ginger Island for 20 Qi Gems, right next to the Hyper Speed-Gro recipe.
Speed-Gro: Turning Days into Harvests
Speed-Gro is the money fertilizer for single-harvest crops. Shave enough days off a crop and you fit another full cycle into the season, which beats any quality bonus.
- Stack it with Agriculturist: The Farming level 10 profession adds another 10% growth speed. Regular Speed-Gro plus Agriculturist gives you 20%, Hyper Speed-Gro plus Agriculturist gives you 43%.
- It does not touch regrowth: On Blueberries, Hops or Cranberries, Speed-Gro only shortens the time to the first harvest. The days between later harvests stay the same.
- Apply it on planting day: You can add Speed-Gro to a planted tile, but putting it down before or with the seed gives you the cleanest result.
Hot Take: Hyper Speed-Gro is wasted on most outdoor fields because each craft makes only one. Save it for Ancient Fruit or Starfruit in the Greenhouse or on Ginger Island, where every day counts.
Retaining Soil: Buying Back Your Mornings
Retaining soil is for fields you cannot reach with sprinklers yet, or for odd corners your sprinkler layout misses. Basic and Quality versions only give a chance to stay watered, so you still need to check the tiles. Deluxe Retaining Soil keeps them watered every night, which makes it worth the 50 Cinder Shards the Island Trader charges for the recipe.
Tree Fertilizer: The Sleeper Pick
Tree Fertilizer is cheap (5 Fiber and 5 Stone) and makes wild tree seeds and saplings shoot up, even in winter. A small fertilized Oak or Pine grove gives you a steady supply of wood, sap and tapper products all year (yes, really). Remember it does nothing for fruit trees.
Rules That Trip People Up
- Season change wipes it: Crop fertilizer disappears when the season changes, unless a crop that grows in both seasons (Corn, Wheat, Sunflower, Coffee Bean, Ancient Fruit) is still in the tile.
- The Greenhouse keeps it: Fertilizer in the Greenhouse stays until you un-till the tile with a pickaxe, so your good stuff is safe there.
- Changing your mind: An axe removes the crop but leaves the fertilizer. A second hit with a pickaxe clears the fertilizer too.
Plenty of farmers are still optimizing their fields years after launch; our Stardew Valley player count page shows how many are playing right now.
Stardew Valley Fertilizer FAQ
Which fertilizer is best in Stardew Valley?
Deluxe Fertilizer for quality on expensive crops, Deluxe or Hyper Speed-Gro for single-harvest crops you replant. Early on, Basic Fertilizer and Speed-Gro from Pierre are fine.
Can you use two fertilizers on one tile?
No. Each tilled tile holds one fertilizer, so you pick between quality, speed or water retention.
Does Speed-Gro work on crops that regrow?
Only for the first harvest. It does not shorten the regrowth time between later harvests.
Does fertilizer carry over to the next season?
Normally no, it vanishes at the season change. It stays if a two-season crop is still growing in the tile, and it always stays in the Greenhouse.
Where do you get the Deluxe Fertilizer recipe?
Qi’s Walnut Room on Ginger Island sells it for 20 Qi Gems. One craft uses 1 Iridium Bar and 40 Sap and makes five.
Actually Do This: craft a stack of Speed-Gro from Pine Tar and Moss this week, put Quality Fertilizer only under your priciest crop, and drop Tree Fertilizer on a few Oak seeds near your tappers. The math doesn’t lie: those three small habits pay for themselves inside one season.
