Fractal Forests
by Frost3ch
Fractal Forests adds a custom forest biome where trees are grown procedurally from L-Systems, producing branching fractal structures for Fabric worlds on 1.21.8 – 1.21.10.
What it does
Trees in the Fractal Forest biome are generated procedurally with the L-Systems method, which builds each trunk and branch from a repeating set of growth rules. The result is a large, self-similar tree shape rather than the fixed templates used by vanilla trees. The biome itself is the main world-generation addition, so players find these forests by exploring new terrain.
A new leaf type, Fractal Leaves, belongs to these trees. Its foliage lets light through, so the ground under a large tree is not left in deep shade. Because the mod generates trees during world creation and chunk generation, it is set up for new worlds and for chunks that have not been generated yet.
The mod is published for Fabric only, with files for 1.21.8, 1.21.9 and 1.21.10. The server and every player need the mod installed. It is released under the MIT License and is open source; its source code is public. The author notes that development is still ongoing and that some bugs remain.
Key features
Procedural fractal trees
Trees are built from L-System rules, so each one grows into a branching shape with self-similar limbs.
Fractal Forest biome
A large biome of custom trees is added to world generation, with its own terrain features and tree spread.
Fractal Leaves
A new leaf type that lets light pass through, so large trees cast smaller shadows on the ground beneath them.
Early development
The author describes the mod as still in development with some known bugs, so behavior may change between updates.
Gallery
Compatibility
Latest build for each game version and loader.
Only full game releases are shown. This mod publishes no snapshot builds.
Questions
Does Fractal Forests need to be installed on the server?
Which game versions does Fractal Forests support?
Is Fractal Forests stable?
In the catalog
Fractal Forests is one of 8,515 World generation mods on ModsFinder, and one of 4,027 World generation mods for Fabric. 15,569 mods support Minecraft 1.21.10.
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Official listing
- Modrinth page
- modrinth.com/mod/fractal-forests
- Owner
- Frost3ch
- Published
- 2025-11-13
- Updated on Modrinth
- 2025-11-25
- Facts verified
- 2026-10-15