diff --git a/src/main/java/ru/bclib/util/BonemealUtil.java b/src/main/java/ru/bclib/util/BonemealUtil.java
new file mode 100644
index 00000000..18baa32e
--- /dev/null
+++ b/src/main/java/ru/bclib/util/BonemealUtil.java
@@ -0,0 +1,60 @@
+package ru.bclib.util;
+
+import java.util.Map;
+import java.util.Random;
+
+import com.google.common.collect.Maps;
+
+import net.minecraft.resources.ResourceLocation;
+import net.minecraft.world.level.block.Block;
+
+public class BonemealUtil {
+	private static final Map<ResourceLocation, Map<Block, WeightedList<Block>>> GRASS_BIOMES = Maps.newHashMap();
+	private static final Map<Block, WeightedList<Block>> GRASS_TYPES = Maps.newHashMap();
+	
+	public static void addBonemealGrass(Block terrain, Block plant) {
+		addBonemealGrass(terrain, plant, 1F);
+	}
+	
+	public static void addBonemealGrass(Block terrain, Block plant, float chance) {
+		WeightedList<Block> list = GRASS_TYPES.get(terrain);
+		if (list == null) {
+			list = new WeightedList<Block>();
+			GRASS_TYPES.put(terrain, list);
+		}
+		list.add(plant, chance);
+	}
+	
+	public static void addBonemealGrass(ResourceLocation biome, Block terrain, Block plant) {
+		addBonemealGrass(biome, terrain, plant, 1F);
+	}
+	
+	public static void addBonemealGrass(ResourceLocation biome, Block terrain, Block plant, float chance) {
+		Map<Block, WeightedList<Block>> map = GRASS_BIOMES.get(biome);
+		if (map == null) {
+			map = Maps.newHashMap();
+			GRASS_BIOMES.put(biome, map);
+		}
+		WeightedList<Block> list = map.get(terrain);
+		if (list == null) {
+			list = new WeightedList<Block>();
+			map.put(terrain, list);
+		}
+		list.add(plant, chance);
+	}
+	
+	public static Block getGrass(ResourceLocation biomeID, Block terrain, Random random) {
+		Map<Block, WeightedList<Block>> map = GRASS_BIOMES.get(biomeID);
+		WeightedList<Block> list = null;
+		if (map != null) {
+			list = map.get(terrain);
+			if (list == null) {
+				list = GRASS_TYPES.get(terrain);
+			}
+		}
+		else {
+			list = GRASS_TYPES.get(terrain);
+		}
+		return list == null ? null : list.get(random);
+	}
+}
diff --git a/src/main/java/ru/bclib/util/WeightedList.java b/src/main/java/ru/bclib/util/WeightedList.java
new file mode 100644
index 00000000..eeb856a9
--- /dev/null
+++ b/src/main/java/ru/bclib/util/WeightedList.java
@@ -0,0 +1,34 @@
+package ru.bclib.util;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Random;
+
+public class WeightedList<T> {
+	private final List<Float> weights = new ArrayList<Float>();
+	private final List<T> values = new ArrayList<T>();
+	private float maxWeight;
+	
+	public void add(T value, float weight) {
+		maxWeight += weight;
+		weights.add(maxWeight);
+		values.add(value);
+	}
+	
+	public T get(Random random) {
+		if (maxWeight < 1) {
+			return null;
+		}
+		float weight = random.nextFloat() * maxWeight;
+		for (int i = 0; i < weights.size(); i++) {
+			if (weight <= weights.get(i)) {
+				return values.get(i);
+			}
+		}
+		return null;
+	}
+
+	public boolean isEmpty() {
+		return maxWeight == 0;
+	}
+}