From b3e03f59acb38b51924e3c214ff9c74b190c05d4 Mon Sep 17 00:00:00 2001
From: sk89q <the.sk89q@gmail.com>
Date: Sat, 1 Mar 2014 16:57:14 -0800
Subject: [PATCH] Don't grow pumpkin patches on non-grass blocks.

---
 .../com/sk89q/worldedit/generator/GardenPatchGenerator.java   | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/main/java/com/sk89q/worldedit/generator/GardenPatchGenerator.java b/src/main/java/com/sk89q/worldedit/generator/GardenPatchGenerator.java
index 61c57e86e..873495ceb 100644
--- a/src/main/java/com/sk89q/worldedit/generator/GardenPatchGenerator.java
+++ b/src/main/java/com/sk89q/worldedit/generator/GardenPatchGenerator.java
@@ -163,6 +163,10 @@ public class GardenPatchGenerator implements RegionFunction {
             position = position.add(0, 1, 0);
         }
 
+        if (editSession.getBlock(position.add(0, -1, 0)).getType() != BlockID.GRASS) {
+            return false;
+        }
+
         BaseBlock leavesBlock = new BaseBlock(BlockID.LEAVES);
 
         editSession.setBlockIfAir(position, leavesBlock);