# Fertilizer

> Fertilizer is a passive in tibo.dog. +8% XP gain per level.

Source page: https://www.tibodog.wiki/passives/fertilizer · Wiki updated 6 Nov 2026, 03:55 UTC · Game version 75 (`main-CSuyb4iv.js`, data synced 5 Nov 2026, 21:45 UTC)

Breadcrumb: [Main page](/) › [Passives](/passives)

| Fertilizer | |
|---|---|
| Stat | XP gain (`growth`) |
| Per level | 0.08 per level |
| Max level | 5 |
| At max level | 0.4 |
| Offer weight | 90 |
| Catalyst for | [Big Fry](/weapons/big-fry), [Overgrowth](/weapons/overgrowth), [Potato Patch](/weapons/potato-patch) |

**Fertilizer** is a passive upgrade in tibo.dog. In-game description: “+8% XP gain per level.”

## Overview

Fertilizer makes every XP gem worth more. Each level adds 0.08 XP gain, so gems give ×1.08 XP at level 1 and ×1.40 at level 5. More XP means more level-ups, and each level-up is another weapon or passive card (see [Level-up](/level-up)).

It is the catalyst for three evolutions: [Big Fry](/weapons/big-fry) (from [Small Fry](/weapons/small-fry)), [Overgrowth](/weapons/overgrowth) (from [Seeker Sprouts](/weapons/seeker-sprouts)) and [Potato Patch](/weapons/potato-patch) (from [Seed Potato](/weapons/seed-potato)).

## How it works

Picking up an XP gem adds its value times Tibo's XP gain multiplier.[sim-BkfBhQfw.js: `s===r.xp)e.gemCount--,e.counters.gems++,ds(e,o*a.growthMult)`] That multiplier is `(1 + XP gain) × (1 + 0.5 × curse) × difficulty XP` (see [Stats](/stats)). The three parts multiply, so Fertilizer at level 5 together with [Rotten Spud](/passives/rotten-spud) at level 5 (curse 0.5) gives 1.4 × 1.25 = ×1.75 before the difficulty factor.

Other XP gain sources are [Compost Tea](/items/compost-tea) (+0.06) and [Spud Shrine](/points-of-interest#spud-shrine) blessings. These add to Fertilizer's total.

## Tips

- XP gain pays off over the rest of the run, so it is worth more the earlier you take it. Late in a run, when most of your weapons and passives are already maxed, extra levels matter less.
- Fertilizer works well with [Potato Magnet](/passives/potato-magnet), which brings gems in from farther away.

## Levels

| Level | XP gain (`growth`) total |
|---|---|
| 1 | 0.08 |
| 2 | 0.16 |
| 3 | 0.24 |
| 4 | 0.32 |
| 5 | 0.4 |

Totals are added to Tibo's stat sum. How each stat turns into a multiplier (caps and diminishing returns) is on [Stats](/stats).

## Catalyst for

| Result | Also needs |
|---|---|
| [Big Fry](/weapons/big-fry) | [Small Fry](/weapons/small-fry) at max level |
| [Overgrowth](/weapons/overgrowth) | [Seeker Sprouts](/weapons/seeker-sprouts) at max level |
| [Potato Patch](/weapons/potato-patch) | [Seed Potato](/weapons/seed-potato) at max level |

## Names in other languages

**Verified**: the name the game shows when another language is selected in Settings, from its translation files. [i18n-ja-content-DO6GrqHt.js: `"content.passive.fertilizer.name":["肥料"]`] See [Languages](/controls#languages).

<details class="raw"><summary>Show names in 26 languages</summary>

| Language | Code | Name |
|---|---|---|
| 简体中文 · Simplified Chinese | `zh-CN` | 肥料 |
| 繁體中文 · Traditional Chinese (Taiwan) | `zh-TW` | 肥料 |
| 日本語 · Japanese | `ja` | 肥料 |
| 한국어 · Korean | `ko` | 비료 |
| Español · Spanish | `es` | Fertilizante |
| हिन्दी · Hindi | `hi` | खाद |
| Deutsch · German | `de` | Dünger |
| Français · French | `fr` | Engrais |
| Português (Brasil) · Brazilian Portuguese | `pt` | Adubo |
| Türkçe · Turkish | `tr` | Gübre |
| Bahasa Indonesia · Indonesian | `id` | Pupuk |
| Русский · Russian | `ru` | Удобрение |
| Bahasa Melayu · Malay | `ms` | Baja |
| Filipino | `fil` | Pataba |
| मराठी · Marathi | `mr` | खत |
| Tiếng Việt · Vietnamese | `vi` | Phân Bón |
| తెలుగు · Telugu | `te` | ఎరువు |
| தமிழ் · Tamil | `ta` | உரம் |
| বাংলা · Bengali | `bn` | সার |
| ไทย · Thai | `th` | ปุ๋ย |
| Hausa | `ha` | Takin Zamani |
| Naijá · Nigerian Pidgin | `pcm` | Fertilizer |
| <bdi>العربية</bdi> · Arabic | `ar` | <bdi>مخصّب</bdi> |
| <bdi>فارسی</bdi> · Persian | `fa` | <bdi>کود</bdi> |
| <bdi>עברית</bdi> · Hebrew | `he` | <bdi>דשן</bdi> |
| <bdi>اردو</bdi> · Urdu | `ur` | <bdi>کھاد</bdi> |

</details>

## Data

```json
{
  "id": "fertilizer",
  "stat": "growth",
  "perLevel": 0.08,
  "maxLevel": 5,
  "weight": 90
}
```

## Sources

Game version 75: `main-CSuyb4iv.js` / `boot-CPW8VVmR.js` / `sim-BkfBhQfw.js` from https://tibo.dog/, researched 2026-11-05. See [Versions & updates](/versions).
- Content registry exported by `boot-CPW8VVmR.js`; boss definitions and order exported by `sim-BkfBhQfw.js`; lazy endgame definitions from `endgame-content-CyuS5vbP.js` and `catalog.generated-JnyrtBzy.js`
- English names and descriptions from `i18n-en-content--0ALgcKX.js`
- Names in other languages from the 26 `i18n-<code>-content` files of `main-CSuyb4iv.js` (`data/i18n-names.json`)