Modscraper Modscraper Minecraft
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Grassidium

Mod

Makes grass alive! Adds the ability for grass, flowers, and ferns to spread and grow based on environmental conditions.

Type

Mod

Modrinth Downloads

1,397

Modrinth ID

93T28LIJ

Last Updated

Oct 17, 2026

Description

Plants spread to nearby blocks depending on light, and by default they do it faster in the rain (land plants only). Small plants like grass, ferns and seagrass can grow into their tall versions, and sea pickles multiply in place. It works underwater too: seagrass, kelp and corals spread on their own.

If too many plants of the same kind are packed together, they stop spreading. Solid blocks stop spreading completely. Fences, iron bars and glass lower the chance by default, and how much is set in the rules below (at 100 they block it fully).

Modded plants work automatically if they use the vanilla plant block tags.

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Settings

No config file, everything is a gamerule, so it's per-world. Set it in World Creation → Game Rules (World Updates) or in-game with /gamerule.

Rule (1.21.1) Rule (1.21.11+) Default What it does
doPlantSpread do_plant_spread true Turns all spreading and growth on/off
plantSpreadChance plant_spread_chance 3 Spread chance for regular plants, %
flowerSpreadChance flower_spread_chance 1 Spread chance for flowers, %
plantGrowthChance plant_growth_chance 1 Chance for small plants to grow tall, %
plantSpreadRadius plant_spread_radius 3 Max spread distance in blocks (1-8)
plantRainMultiplier plant_rain_multiplier 150 Growth speed in rain, % (150 = 1.5x)
plantObstaclePenalty plant_obstacle_penalty 50 Spread penalty through fences/glass, % (100 = fully blocked)

Compatibility

Mod Loaders

Neoforge

Game Versions

1.21.1 1.21.4 1.21.10 1.21.11 26.2 26.3

Recommended Gear

Affiliate

Hardware and extras that pair well with this mod.

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Screenshots

Similar Mods

Included in Modpacks (1)

External Resources