diff --git a/src/main/java/ru/windcorp/progressia/common/world/ChunkData.java b/src/main/java/ru/windcorp/progressia/common/world/ChunkData.java
index 2625d6b..86b226c 100644
--- a/src/main/java/ru/windcorp/progressia/common/world/ChunkData.java
+++ b/src/main/java/ru/windcorp/progressia/common/world/ChunkData.java
@@ -115,7 +115,14 @@ public class ChunkData {
 				getTiles(pos, BlockFace.TOP).add(grass);
 				for (BlockFace face : BlockFace.getFaces()) {
 					if (face.getVector().z != 0) continue;
-					getTiles(pos, face).add(grass);
+					pos.add(face.getVector());
+					
+					if (!isInBounds(pos) || (getBlock(pos) == air)) {
+						pos.sub(face.getVector());
+						getTiles(pos, face).add(grass);
+					} else {
+						pos.sub(face.getVector());
+					}
 				}
 				
 				int hash = x*x * 19 ^ y*y * 41 ^ pos.z*pos.z * 147;
diff --git a/src/main/java/ru/windcorp/progressia/server/world/TickContext.java b/src/main/java/ru/windcorp/progressia/server/world/TickContext.java
index de41d98..82b18e0 100644
--- a/src/main/java/ru/windcorp/progressia/server/world/TickContext.java
+++ b/src/main/java/ru/windcorp/progressia/server/world/TickContext.java
@@ -1,5 +1,7 @@
 package ru.windcorp.progressia.server.world;
 
+import java.util.Random;
+
 import ru.windcorp.progressia.common.world.WorldData;
 import ru.windcorp.progressia.server.Server;
 import ru.windcorp.progressia.server.world.tasks.WorldAccessor;
@@ -18,6 +20,10 @@ public interface TickContext {
 		return getServer().getWorldAccessor();
 	}
 	
+	default Random getRandom() {
+		return getServer().getAdHocRandom();
+	}
+	
 	default WorldData getWorldData() {
 		return getWorld().getData();
 	}
diff --git a/src/main/java/ru/windcorp/progressia/server/world/tile/EdgeTileLogic.java b/src/main/java/ru/windcorp/progressia/server/world/tile/EdgeTileLogic.java
index 0c72f8a..516d6a5 100644
--- a/src/main/java/ru/windcorp/progressia/server/world/tile/EdgeTileLogic.java
+++ b/src/main/java/ru/windcorp/progressia/server/world/tile/EdgeTileLogic.java
@@ -19,10 +19,10 @@ public class EdgeTileLogic extends TileLogic implements UpdateableTile {
 	
 	@Override
 	public boolean canOccupyFace(TileTickContext context) {
-		boolean canOccupy = false;
-		canOccupy ^= canOccupyFace(context, context.getCurrentFace(), context.getCurrentBlockContext());
-		canOccupy ^= canOccupyFace(context, context.getCounterFace(), context.getCounterBlockContext());
-		return canOccupy;
+		boolean canOccupyCurrent = canOccupyFace(context, context.getCurrentFace(), context.getCurrentBlockContext());
+		boolean canOccupyCounter = canOccupyFace(context, context.getCounterFace(), context.getCounterBlockContext());
+		
+		return (canOccupyCurrent != canOccupyCounter) || (canOccupyCurrent && canOccupyCounter && canBeSquashed(context));
 	}
 	
 	public boolean canOccupyFace(TileTickContext ownContext, BlockFace blockFace, BlockTickContext blockContext) {
@@ -31,5 +31,9 @@ public class EdgeTileLogic extends TileLogic implements UpdateableTile {
 		
 		return block.isSolid(blockContext, ownContext.getCurrentFace());
 	}
+	
+	public boolean canBeSquashed(TileTickContext context) {
+		return false;
+	}
 
 }
diff --git a/src/main/java/ru/windcorp/progressia/test/TestTileLogicGrass.java b/src/main/java/ru/windcorp/progressia/test/TestTileLogicGrass.java
index 4358d2c..b3212bc 100644
--- a/src/main/java/ru/windcorp/progressia/test/TestTileLogicGrass.java
+++ b/src/main/java/ru/windcorp/progressia/test/TestTileLogicGrass.java
@@ -6,43 +6,56 @@ import ru.windcorp.progressia.server.Server;
 import ru.windcorp.progressia.server.world.TickAndUpdateUtil;
 import ru.windcorp.progressia.server.world.block.BlockLogic;
 import ru.windcorp.progressia.server.world.block.BlockTickContext;
+import ru.windcorp.progressia.server.world.ticking.TickingPolicy;
 import ru.windcorp.progressia.server.world.tile.EdgeTileLogic;
+import ru.windcorp.progressia.server.world.tile.TickableTile;
 import ru.windcorp.progressia.server.world.tile.TileTickContext;
 
-public class TestTileLogicGrass extends EdgeTileLogic {
+public class TestTileLogicGrass extends EdgeTileLogic implements TickableTile {
 
 	public TestTileLogicGrass(String id) {
 		super(id);
 	}
 	
-	private boolean isBlockAboveTransparent(Server server, Vec3i blockInWorld) {
-		BlockTickContext blockAboveContext = TickAndUpdateUtil.getBlockTickContext(server, blockInWorld.add_(BlockFace.TOP.getVector()));
-		
-		BlockLogic blockAbove = blockAboveContext.getBlock();
-		if (blockAbove == null) return true;
-		
-		return blockAbove.isTransparent(blockAboveContext);
+	@Override
+	public TickingPolicy getTickingPolicy(TileTickContext context) {
+		return TickingPolicy.RANDOM;
 	}
 	
 	@Override
-	public void update(TileTickContext context) {
-		super.update(context);
-		
-		if (
-				!(
-						context.getCurrentFace() == BlockFace.BOTTOM
-						||
-						isBlockAboveTransparent(context.getServer(), context.getCurrentBlockInWorld())
-				)
-				||
-				!(
-						context.getCounterFace() == BlockFace.BOTTOM
-						||
-						isBlockAboveTransparent(context.getServer(), context.getCounterBlockInWorld())
-				)
-		) {
+	public void tick(TileTickContext context) {
+		if (!isLocationSuitable(context)) {
 			context.removeThisTile();
 		}
 	}
 
+	@Override
+	public boolean canBeSquashed(TileTickContext context) {
+		return true;
+	}
+
+	private boolean isLocationSuitable(TileTickContext context) {
+		return
+				isSuitableHost(context.getCurrentBlockContext(), context.getCurrentFace()) !=
+				isSuitableHost(context.getCounterBlockContext(), context.getCounterFace());
+	}
+
+	private boolean isSuitableHost(BlockTickContext bctxt, BlockFace face) {
+		if (face == BlockFace.BOTTOM) return false;
+		
+		BlockLogic block = bctxt.getBlock();
+		if (block == null) return false;
+		if (!block.isSolid(bctxt, face)) return false;
+		return isBlockAboveTransparent(bctxt.getServer(), bctxt.getBlockInWorld());
+	}
+	
+	private boolean isBlockAboveTransparent(Server server, Vec3i blockInWorld) {
+		BlockTickContext bctxt = TickAndUpdateUtil.getBlockTickContext(server, blockInWorld.add_(BlockFace.TOP.getVector()));
+		
+		BlockLogic block = bctxt.getBlock();
+		if (block == null) return true;
+		
+		return block.isTransparent(bctxt);
+	}
+
 }