Alchemy Factory Fertilizer Guide — Recipes, Nutrient Tiers and Efficiency

Fertilizer is the multiplier behind everything in Alchemy Factory, and the reason is indirect: the cauldron does not care whether its item value came from expensive ores or cheap plants, only that you do not repeat an item. That means fertilizer upgrades let you make plant byproducts at a fraction of normal cost and then turn those into advanced materials. The entry recipe is deliberately cheap — Basic Fertilizer is one Plant Ash and one Quicklime Powder.

How Fertilizer Works

The Codex lists Basic Fertilizer in the Fertilizer category with Plant Ash at 1x and 15/min plus Quicklime Powder at 1x and 15/min. From there, the value you can deliver per second scales through the documented tiers, which is what makes high-efficiency fertilizer the foundation of a cauldron economy rather than a side activity. The community guide's example is a dozen cauldrons fed by Flax, Sage, Redcurrant and Lavender producing Lapis Lazuli at roughly a third of the traditional production cost.

Fertilizer output	Where it is used
Plant byproducts	Cauldron input value at a fraction of normal cost
Growth Potion	Higher-yield cauldron feeding
Fertile Catalyst	Late-game nutrient density
Panacea Potion	Top-tier nutrient value and rate

Fertilizer and Nutrient Tiers

The Codex nutrient selector publishes five options with their values and per-second rates. These are the values the calculator uses when estimating heat and nutrient cost, so they double as a progression ladder from early farming to endgame cauldron feeding.

Tier	Nutrient value	Per second
No Fertilizer	—	—
Basic Fertilizer	144	12
Advanced Fertilizer	720	144
Growth Potion	6,480	2,160
Fertile Catalyst	24,000	6,000
Panacea Potion	200,000	20,000

Why Fertilizer Efficiency Comes First

The guide's position is uncompromising: fertilize first, everything else later. It notes that cauldron cost efficiency against normal production ranges from about 50% better to 200% worse depending on the item, which is exactly why the input cost matters so much — a cheap fertilizer input moves every recipe toward the good end of that range. It also recommends waiting until at least 200%, and possibly 300%, Fertilizer Efficiency before spending points on conveyor speed, fuel or negotiation.

• Fertilizer upgrades are described as the "secret technique" for a dominant mid-game.
• Plant byproducts from upgraded fertilizer cost a third to a quarter of normal materials.
• The cauldron ignores the source of value, so cheap inputs do not degrade the output.
• Points in logistics, fuel or negotiation are quality-of-life, not the main line.
• Switch to Growth Potions as soon as they are craftable to raise yield sharply.

Getting the input chain right early pays off for the whole run:

• Build a Compost Bin or equivalent before scaling any cauldron line.
• Keep Plant Ash and Quicklime Powder flowing rather than batch-producing fertilizer.
• Upgrade Fertilizer Efficiency before adding cauldrons, not after.
• Re-check nutrient values after 1.0 in case the Early Access figures moved.

What is not confirmed.

The exact Plant Ash and Quicklime Powder production chains, the cost of moving from Growth Potion to Fertile Catalyst, and whether the nutrient values changed with 1.0 are not documented yet; the Codex figures carry an Early Access version stamp. For how those values are spent, see cauldron recipes, and for which upgrade tracks compete with fertilizer, see the upgrade guide.