diff --git a/src/main/java/world/bentobox/greenhouses/listeners/SnowTracker.java b/src/main/java/world/bentobox/greenhouses/listeners/SnowTracker.java
index 6ac8e0c..b167c49 100644
--- a/src/main/java/world/bentobox/greenhouses/listeners/SnowTracker.java
+++ b/src/main/java/world/bentobox/greenhouses/listeners/SnowTracker.java
@@ -14,6 +14,7 @@ import org.bukkit.block.BlockFace;
 import org.bukkit.block.Hopper;
 import org.bukkit.event.EventHandler;
 import org.bukkit.event.Listener;
+import org.bukkit.event.block.BlockFormEvent;
 import org.bukkit.event.weather.WeatherChangeEvent;
 import org.bukkit.inventory.ItemStack;
 import org.bukkit.scheduler.BukkitTask;
@@ -42,8 +43,8 @@ public class SnowTracker implements Listener {
     private boolean getAirBlocks(Greenhouse gh) {
         boolean createdSnow = false;
         List<Block> waterBlocks = new ArrayList<>();
-        for (int x = (int)gh.getBoundingBox().getMinX() + 1; x < (int)gh.getBoundingBox().getMaxX(); x++) {
-            for (int z = (int)gh.getBoundingBox().getMinZ() + 1; z < (int)gh.getBoundingBox().getMaxZ(); z++) {
+        for (int x = (int)gh.getBoundingBox().getMinX() + 1; x < (int)gh.getBoundingBox().getMaxX() -1; x++) {
+            for (int z = (int)gh.getBoundingBox().getMinZ() + 1; z < (int)gh.getBoundingBox().getMaxZ() - 1; z++) {
                 for (int y = (int)gh.getBoundingBox().getMaxY() - 2; y >= (int)gh.getBoundingBox().getMinY(); y--) {
                     Block b = gh.getLocation().getWorld().getBlockAt(x, y, z);
                     Material type = b.getType();
@@ -55,7 +56,9 @@ public class SnowTracker implements Listener {
                             waterBlocks.add(b);
                         } else {
                             // Not water
-                            if (Math.random() < addon.getSettings().getSnowDensity() && !b.isLiquid()) {
+                            if (Math.random() < addon.getSettings().getSnowDensity() 
+                                    && !b.isLiquid() 
+                                    && b.getRelative(BlockFace.UP).getType().equals(Material.AIR)) {
                                 b.getRelative(BlockFace.UP).setType(Material.SNOW);
                                 createdSnow = true;
                             }
@@ -67,13 +70,27 @@ public class SnowTracker implements Listener {
             }
         }
         // Check if any water blocks can be turned to ice
+        /*
+         * TODO - find a way to calculate water blocks
         int maxSize = waterBlocks.size() - (gh.getArea() / gh.getBiomeRecipe().getWaterCoverage());
         if (maxSize > 0) {
             waterBlocks.stream().limit(maxSize).filter(b -> Math.random() < addon.getSettings().getSnowDensity()).forEach(b -> b.setType(Material.ICE));
         }
+        */
         return createdSnow;
     }
 
+    /**
+     * TODO finish
+     * @param e
+     */
+    @EventHandler
+    public void onBlockFormEvent(final BlockFormEvent e) {
+       if (e.getNewState().getType().equals(Material.SNOW) && addon.getManager().getMap().isAboveGreenhouse(e.getBlock().getLocation())) {
+           e.setCancelled(true);
+       }
+    }
+    
     @EventHandler
     public void onWeatherChangeEvent(final WeatherChangeEvent e) {
         if (!addon.getActiveWorlds().contains(e.getWorld())) {
diff --git a/src/test/java/world/bentobox/greenhouses/listeners/GreenhouseEventsTest.java b/src/test/java/world/bentobox/greenhouses/listeners/GreenhouseEventsTest.java
deleted file mode 100644
index 50fdcab..0000000
--- a/src/test/java/world/bentobox/greenhouses/listeners/GreenhouseEventsTest.java
+++ /dev/null
@@ -1,93 +0,0 @@
-package world.bentobox.greenhouses.listeners;
-
-import static org.junit.Assert.fail;
-
-import org.junit.After;
-import org.junit.Before;
-import org.junit.Test;
-
-/**
- * @author tastybento
- *
- */
-public class GreenhouseEventsTest {
-
-    /**
-     * @throws java.lang.Exception
-     */
-    @Before
-    public void setUp() throws Exception {
-    }
-
-    /**
-     * @throws java.lang.Exception
-     */
-    @After
-    public void tearDown() throws Exception {
-    }
-
-    /**
-     * Test method for {@link world.bentobox.greenhouses.listeners.GreenhouseEvents#GreenhouseEvents(world.bentobox.greenhouses.Greenhouses)}.
-     */
-    @Test
-    public void testGreenhouseEvents() {
-        fail("Not yet implemented");
-    }
-
-    /**
-     * Test method for {@link world.bentobox.greenhouses.listeners.GreenhouseEvents#onPlayerInteract(org.bukkit.event.player.PlayerInteractEvent)}.
-     */
-    @Test
-    public void testOnPlayerInteract() {
-        fail("Not yet implemented");
-    }
-
-    /**
-     * Test method for {@link world.bentobox.greenhouses.listeners.GreenhouseEvents#onIceBreak(org.bukkit.event.block.BlockBreakEvent)}.
-     */
-    @Test
-    public void testOnIceBreak() {
-        fail("Not yet implemented");
-    }
-
-    /**
-     * Test method for {@link world.bentobox.greenhouses.listeners.GreenhouseEvents#onPlayerMove(org.bukkit.event.player.PlayerMoveEvent)}.
-     */
-    @Test
-    public void testOnPlayerMove() {
-        fail("Not yet implemented");
-    }
-
-    /**
-     * Test method for {@link world.bentobox.greenhouses.listeners.GreenhouseEvents#onPlayerTeleport(org.bukkit.event.player.PlayerTeleportEvent)}.
-     */
-    @Test
-    public void testOnPlayerTeleport() {
-        fail("Not yet implemented");
-    }
-
-    /**
-     * Test method for {@link world.bentobox.greenhouses.listeners.GreenhouseEvents#onBlockBreak(org.bukkit.event.block.BlockBreakEvent)}.
-     */
-    @Test
-    public void testOnBlockBreak() {
-        fail("Not yet implemented");
-    }
-
-    /**
-     * Test method for {@link world.bentobox.greenhouses.listeners.GreenhouseEvents#onPlayerBlockPlace(org.bukkit.event.block.BlockPlaceEvent)}.
-     */
-    @Test
-    public void testOnPlayerBlockPlace() {
-        fail("Not yet implemented");
-    }
-
-    /**
-     * Test method for {@link world.bentobox.greenhouses.listeners.GreenhouseEvents#onPistonPush(org.bukkit.event.block.BlockPistonExtendEvent)}.
-     */
-    @Test
-    public void testOnPistonPush() {
-        fail("Not yet implemented");
-    }
-
-}