Physis

Plants spread through a seed-based simulation instead of simple random placement. A multi-octave Value Noise system seeded from the world seed decides where vegetation grows, so distribution follows biome-scale, patch-scale and detail-scale patterns close to vanilla world generation. Growth is hooked to chunk ticking, so vegetation keeps growing and competing in loaded chunks regardless of how far a player is away.

Every plant type follows its own growth speed, density ceiling and minimum gap between plants. When a cluster exceeds its maximum density, excess vegetation is pruned at random rather than halting growth, which keeps the landscape from looking like a solid carpet. Water and shade also shape the result, since plants near rivers and coastlines grow faster and many species favor the darkest spots under tree canopies and fungi. Clusters that reach their limit can send pioneers 10 to 30 blocks away to start new colonies.

The mod is client and server, so the server and every player need it. It is published for Fabric only, with files for 1.16 – 26.1.2 and 1.0.0 for 1.17.1 as the latest file, under the MIT License, and the source code is public.