Rust Composter & Fertilizer
A composter turns leftover food — berries, corn, pumpkins, cloth and other organic items — into fertilizer. Adding fertilizer to a planter boosts growth so your crops mature and yield faster.
How composting works
Drop organic items into the composter and it breaks them down over time, advancing every 5 minutes (300 seconds). Each item adds a fixed amount of fertilizer to a running total, and whenever that total passes a whole number the composter outputs that many fertilizer. Berries and surplus harvest are ideal inputs — farming naturally produces more than you can eat, and the excess becomes free fertilizer.
How much fertilizer each item makes
Most organic items produce a fraction of a fertilizer each, so you need several to get one back out. The game’s base value is 0.2 per item, and the standouts are Horse Dung (a full 5) and Small Trout (0.8):
| Item | Fertilizer per item | Items per fertilizer |
|---|---|---|
| Horse Dung | 5.0 | 1 → 5 fertilizer |
| Small Trout | 0.8 | ~2 |
| Apple | 0.2 | 5 |
| Berries, corn, pumpkin, potato, mushroom, wheat | 0.2 – 0.3 | ~4–6 |
| Cloth, cooked & raw meat, other organics | 0.2 – 0.3 | ~4–6 |
Using fertilizer
Fertilizer is consumed by planters to improve growth conditions. Combined with GGGYYY genetics, good water, and light, fertilizer helps you hit the top of a plant’s yield potential. It pairs especially well with a high-throughput cloth or food farm where you want maximum output per planter.
Frequently Asked Questions
How many items make one fertilizer in Rust?
Most organic items produce 0.2 to 0.3 fertilizer each, so it takes about 4 to 6 items to make one fertilizer. Horse Dung is the exception at 5 fertilizer per piece, and Small Trout gives 0.8.
What can you put in a composter in Rust?
Organic items such as berries, corn, pumpkins, mushrooms, potatoes, apples, cloth, and meat. Surplus harvest from your own farm is the cheapest source, and Horse Dung is the most efficient.
Does fertilizer increase yield in Rust?
Fertilizer improves a planter’s growing conditions, which helps plants reach their full growth speed and yield. It stacks with good genetics, water, and light.
