--- ../src-base/minecraft/net/minecraft/block/BlockGrass.java
+++ ../src-work/minecraft/net/minecraft/block/BlockGrass.java
@@ -15,6 +15,12 @@
 import org.apache.logging.log4j.LogManager;
 import org.apache.logging.log4j.Logger;
 
+// CraftBukkit start
+import org.bukkit.block.BlockState;
+import org.bukkit.event.block.BlockSpreadEvent;
+import org.bukkit.event.block.BlockFadeEvent;
+// CraftBukkit end
+
 public class BlockGrass extends Block implements IGrowable
 {
     private static final Logger logger = LogManager.getLogger();
@@ -45,11 +51,25 @@
         {
             if (p_149674_1_.getBlockLightValue(p_149674_2_, p_149674_3_ + 1, p_149674_4_) < 4 && p_149674_1_.getBlockLightOpacity(p_149674_2_, p_149674_3_ + 1, p_149674_4_) > 2)
             {
-                p_149674_1_.setBlock(p_149674_2_, p_149674_3_, p_149674_4_, Blocks.dirt);
+                // CraftBukkit start
+                org.bukkit.World bworld = p_149674_1_.getWorld();
+                BlockState blockState = bworld.getBlockAt(p_149674_2_, p_149674_3_, p_149674_4_).getState();
+                blockState.setTypeId(Block.getIdFromBlock(Blocks.dirt));
+                BlockFadeEvent event = new BlockFadeEvent(blockState.getBlock(), blockState);
+                p_149674_1_.getServer().getPluginManager().callEvent(event);
+
+                if (!event.isCancelled())
+                {
+                    blockState.update(true);
+                }
+
+                // CraftBukkit end
             }
             else if (p_149674_1_.getBlockLightValue(p_149674_2_, p_149674_3_ + 1, p_149674_4_) >= 9)
             {
-                for (int l = 0; l < 4; ++l)
+                int numGrowth = Math.min(4, Math.max(20, (int)(4 * 100F / p_149674_1_.growthOdds)));  // Spigot
+
+                for (int l = 0; l < numGrowth; ++l)   // Spigot
                 {
                     int i1 = p_149674_2_ + p_149674_5_.nextInt(3) - 1;
                     int j1 = p_149674_3_ + p_149674_5_.nextInt(5) - 3;
@@ -58,7 +78,19 @@
 
                     if (p_149674_1_.getBlock(i1, j1, k1) == Blocks.dirt && p_149674_1_.getBlockMetadata(i1, j1, k1) == 0 && p_149674_1_.getBlockLightValue(i1, j1 + 1, k1) >= 4 && p_149674_1_.getBlockLightOpacity(i1, j1 + 1, k1) <= 2)
                     {
-                        p_149674_1_.setBlock(i1, j1, k1, Blocks.grass);
+                        // CraftBukkit start
+                        org.bukkit.World bworld = p_149674_1_.getWorld();
+                        BlockState blockState = bworld.getBlockAt(i1, j1, k1).getState();
+                        blockState.setTypeId(Block.getIdFromBlock(Blocks.grass));
+                        BlockSpreadEvent event = new BlockSpreadEvent(blockState.getBlock(), bworld.getBlockAt(p_149674_2_, p_149674_3_, p_149674_4_), blockState);
+                        p_149674_1_.getServer().getPluginManager().callEvent(event);
+
+                        if (!event.isCancelled())
+                        {
+                            blockState.update(true);
+                        }
+
+                        // CraftBukkit end
                     }
                 }
             }