--- ../src-base/minecraft/net/minecraft/block/BlockMushroom.java
+++ ../src-work/minecraft/net/minecraft/block/BlockMushroom.java
@@ -6,6 +6,12 @@
 import net.minecraft.world.gen.feature.WorldGenBigMushroom;
 import net.minecraftforge.common.util.ForgeDirection;
 
+// CraftBukkit start
+import org.bukkit.block.BlockState;
+import org.bukkit.event.block.BlockSpreadEvent;
+import org.bukkit.TreeType;
+// CraftBukkit end
+
 public class BlockMushroom extends BlockBush implements IGrowable
 {
     private static final String __OBFID = "CL_00000272";
@@ -19,7 +25,9 @@
 
     public void updateTick(World p_149674_1_, int p_149674_2_, int p_149674_3_, int p_149674_4_, Random p_149674_5_)
     {
-        if (p_149674_5_.nextInt(25) == 0)
+        final int sourceX = p_149674_2_, sourceY = p_149674_3_, sourceZ = p_149674_4_; // CraftBukkit
+
+        if (p_149674_5_.nextInt(Math.max(1, (int) p_149674_1_.growthOdds / p_149674_1_.getSpigotConfig().mushroomModifier * 25)) == 0)   // Spigot // Cauldron
         {
             byte b0 = 4;
             int l = 5;
@@ -66,7 +74,19 @@
 
             if (p_149674_1_.isAirBlock(i1, j1, k1) && this.canBlockStay(p_149674_1_, i1, j1, k1))
             {
-                p_149674_1_.setBlock(i1, j1, k1, this, 0, 2);
+                // CraftBukkit start
+                org.bukkit.World bworld = p_149674_1_.getWorld();
+                BlockState blockState = bworld.getBlockAt(i1, j1, k1).getState();
+                blockState.setTypeId(Block.getIdFromBlock(this)); // nms: this.id, 0, 2
+                BlockSpreadEvent event = new BlockSpreadEvent(blockState.getBlock(), bworld.getBlockAt(sourceX, sourceY, sourceZ), blockState);
+                p_149674_1_.getServer().getPluginManager().callEvent(event);
+
+                if (!event.isCancelled())
+                {
+                    blockState.update(true);
+                }
+
+                // CraftBukkit end
             }
         }
     }
@@ -102,10 +122,12 @@
 
         if (this == Blocks.brown_mushroom)
         {
+            BlockSapling.treeType = TreeType.BROWN_MUSHROOM; // CraftBukkit
             worldgenbigmushroom = new WorldGenBigMushroom(0);
         }
         else if (this == Blocks.red_mushroom)
         {
+            BlockSapling.treeType = TreeType.RED_MUSHROOM; // CraftBukkit
             worldgenbigmushroom = new WorldGenBigMushroom(1);
         }