diff --git a/blocks.py b/blocks.py
index 5f3980f1..0b2bc885 100644
--- a/blocks.py
+++ b/blocks.py
@@ -361,9 +361,14 @@ def update_texture(self):
                     setattr(self, k, get_texture_coordinates(*v))
             self.texture_data = self.get_texture_data()
 
-    def on_neighbor_change(self, world, neighbor_pos, self_pos):
+    def on_neighbor_change(self, world: custom_types.World, neighbor_pos: iVector, self_pos: iVector):
         pass
 
+    def generic_on_missing_floor_drop(self, world: custom_types.World, neighbor_pos: iVector, self_pos: iVector):
+        if not world.get_block_below(self_pos):
+            world.remove_block(None, self_pos)
+            # todo: actually drop an item
+
     def can_place_on(self, block_id):
         return False
 
@@ -445,9 +450,10 @@ def get_color(self, temperature, humidity):
         ret.extend([1] * 60)
         return ret
 
-    def on_neighbor_change(self, world, neighbor_pos, self_pos):
+    def on_neighbor_change(self, world: custom_types.World, neighbor_pos: iVector, self_pos: iVector):
         # something has been put on this grass block, which makes it become dirt block
-        if (self_pos[0], self_pos[1] + 1, self_pos[-1]) in world:
+        block_above = world.get_block_above(self_pos)
+        if block_above and not block_above.transparent:
             world.remove_block(None, self_pos)
             world.add_block(self_pos, dirt_block)
 
@@ -878,10 +884,7 @@ class TorchBlock(WoodBlock):
     id = 50
     name = "Torch"
 
-    def on_neighbor_change(self, world, neighbor_pos, self_pos):
-        # the block under this torch has been removed, so remove the torch too
-        if (self_pos[0], self_pos[1] - 1, self_pos[-1]) not in world:
-            world.remove_block(None, self_pos)
+    on_neighbor_change = Block.generic_on_missing_floor_drop
 
 class YFlowersBlock(Block):
     vertex_mode = G.VERTEX_CROSS
@@ -900,9 +903,7 @@ def __init__(self):
         super(YFlowersBlock, self).__init__()
         self.texture_data = self.texture_data[0:2 * 4 * 2]
 
-    def on_neighbor_change(self, world, neighbor_pos, self_pos):
-        if (self_pos[0], self_pos[1] - 1, self_pos[-1]) not in world:
-            world.remove_block(None,self_pos)
+    on_neighbor_change = Block.generic_on_missing_floor_drop
 
 
 class StoneSlabBlock(HardBlock):
@@ -1043,9 +1044,9 @@ def __init__(self):
         super(FarmBlock, self).__init__()
         self.drop_id = BlockID(DirtBlock.id)
 
-    def on_neighbor_change(self, world, neighbor_pos, self_pos):
-        # replace self with dirt
-        if (self_pos[0], self_pos[1] + 1, self_pos[-1]) in world:
+    def on_neighbor_change(self, world: custom_types.World, neighbor_pos: iVector, self_pos: iVector):
+        block_above = world.get_block_above(self_pos)
+        if block_above and not block_above.transparent:
             world.remove_block(None, self_pos)
             world.add_block(self_pos, dirt_block)
 
@@ -1322,9 +1323,7 @@ def __init__(self):
         super(RoseBlock, self).__init__()
         self.texture_data = self.texture_data[0:2 * 4 * 2]
 
-    def on_neighbor_change(self, world, neighbor_pos, self_pos):
-        if (self_pos[0], self_pos[1] - 1, self_pos[-1]) not in world:
-            world.remove_block(None, self_pos)
+    on_neighbor_change = Block.generic_on_missing_floor_drop
 
 class ReedBlock(Block):
     texture_name = "reeds"
@@ -1339,9 +1338,7 @@ class ReedBlock(Block):
     max_stack_size = 16
     amount_label_color = 0, 0, 0, 255
 
-    def on_neighbor_change(self, world, neighbor_pos, self_pos):
-        if (self_pos[0], self_pos[1] - 1, self_pos[-1]) not in world:
-            world.remove_block(None, self_pos)
+    on_neighbor_change = Block.generic_on_missing_floor_drop
 
 class CropBlock(Block):
     top_texture = -1, -1
@@ -1415,9 +1412,7 @@ def update_tile_entity(self, value):
             if nbt['action'] == 'fertilize':
                 self.entity.fertilize()
 
-    def on_neighbor_change(self, world, neighbor_pos, self_pos):
-        if (self_pos[0], self_pos[1] - 1, self_pos[-1]) not in world:
-            world.remove_block(None, self_pos)
+    on_neighbor_change = Block.generic_on_missing_floor_drop
 
 class PotatoBlock(CropBlock):
     id = 142
@@ -1519,9 +1514,7 @@ def drop_id(self):
     def drop_id(self, value):
         self._drop_id = value
 
-    def on_neighbor_change(self, world, neighbor_pos, self_pos):
-        if (self_pos[0], self_pos[1] - 1, self_pos[-1]) not in world:
-            world.remove_block(None, self_pos)
+    on_neighbor_change = Block.generic_on_missing_floor_drop
 
 # More tall grass blocks
 
@@ -1582,9 +1575,7 @@ class DesertGrassBlock(TallGrassBlock):
     name = "Desert Grass"
     texture_name = 'wg_red_bush'
 
-    def on_neighbor_change(self, world, neighbor_pos, self_pos):
-        if (self_pos[0], self_pos[1] - 1, self_pos[-1]) not in world:
-            world.remove_block(None, self_pos)
+    on_neighbor_change = Block.generic_on_missing_floor_drop
 
 
 class DeadBushBlock(TallGrassBlock):
@@ -1593,9 +1584,7 @@ class DeadBushBlock(TallGrassBlock):
     name = "Dead bush"
     texture_name = 'deadbush'
 
-    def on_neighbor_change(self, world, neighbor_pos, self_pos):
-        if (self_pos[0], self_pos[1] - 1, self_pos[-1]) not in world:
-            world.remove_block(None, self_pos)
+    on_neighbor_change = Block.generic_on_missing_floor_drop
 
 
 class DiamondBlock(HardBlock):