CustomTree
by _genki_10
CustomTree swaps the vanilla world-generation trees for custom-made tree structures stored as NBT files, so forests and other biomes grow different trees.
What it does
Vanilla tree generation is replaced by structures built from NBT data, with each tree variant designed for the biomes it appears in. The mod aims to keep forests and other natural areas looking more detailed, while leaving other world generation untouched where possible. Its goal is to support nearly the latest Minecraft release, and older versions are not planned for the time being.
Because the trees are generated on the server, the mod needs to be installed on the server side, and clients must also have it. Only Fabric is supported, with builds for 1.21.11 and 26.1.2. The latest file is 1.0.2 for 26.1.2, a beta release from 2026-05-20. The mod is released under All rights reserved and is not open source, so it cannot be ported or redistributed under its license. Compatibility with other world generation mods is maintained where possible, but it cannot be promised, and mods that change tree generation may conflict.
Key features
Custom NBT tree structures
Vanilla trees are replaced by tree structures defined in NBT files, each one hand-designed for its place in the world.
Biome-specific trees
Unique tree types are generated across the biomes the mod supports, so the same forest type does not repeat everywhere.
Lightweight package
The whole mod is about 1 MB, which suits modpacks and multiplayer servers that need little extra data.
Tectonic compatibility
The author states full compatibility with Tectonic, a related world-generation mod that can be used alongside it.
Gallery
Compatibility
Latest build for each game version and loader.
Only full game releases are shown. This mod publishes no snapshot builds.
Use cases
Who it’s for: The mod suits players and server owners who want forests and other biomes to look different, and who run Fabric on 1.21.11 or 26.1.2.
How it compares
Tectonic is open source under the MIT License and runs on Fabric, Forge, NeoForge and Quilt for 1.18.2 – 26.3, with the server required and the client optional. Skylark is also open source under the MIT License, but only on Fabric for 1.18.2 – 1.21.1 and server-side only, so players join without installing it. Extreme Worldgen is not open source under All rights reserved and covers only 1.21.4 – 1.21.5.
| Mod | Loaders | Game versions | Environment | Updated |
|---|---|---|---|---|
| CustomTree | Fabric | 1.21.11 – 26.1.2 | Server-side only | 2026-05-20 |
| Tectonic | Fabric, Forge, NeoForge and Quilt | 1.18.2 – 26.3 | Server required, client optional | 2026-09-27 |
| Skylark | Fabric | 1.18.2 – 1.21.1 | Server-side only | 2024-07-15 |
| Extreme Worldgen | Fabric, Forge, NeoForge and Quilt | 1.21.4 – 1.21.5 | Server required, client optional | 2025-05-03 |
Questions
Does CustomTree need to be installed on the client?
Which versions does CustomTree support?
Will CustomTree conflict with other tree mods?
In the catalog
CustomTree is one of 8,515 World generation mods on ModsFinder, and one of 4,027 World generation mods for Fabric. 15,189 mods support Minecraft 26.1.2.
More from _genki_10
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What the author says
CustomTree is a modern world-generation mod for Minecraft that replaces vanilla trees with custom-made and carefully designed NBT structures. The mod enhances forests and natural environments with more detailed tree generation while trying to maintain compatibility with other mods as well as world generation…
Official listing
- Modrinth page
- modrinth.com/mod/customtree
- Owner
- _genki_10
- Published
- 2026-05-06
- Updated on Modrinth
- 2026-05-20
- Facts verified
- 2026-10-15