diff --git a/mods/bg_tree/grow_sapling.lua b/mods/bg_tree/grow_sapling.lua
index ff32078..a0bd194 100644
--- a/mods/bg_tree/grow_sapling.lua
+++ b/mods/bg_tree/grow_sapling.lua
@@ -38,6 +38,9 @@ end
 ]]--
 
 local sapling_grow_cost = 2000
+local sapling_can_replace = {
+	modname .. ":leaves_alive",
+}
 
 blockgame.register_increasing_abm({
 	id = modname .. ":grow_sapling",
@@ -58,7 +61,8 @@ blockgame.register_increasing_abm({
 		if not supports_sapling(below_name) then return false end
 
 		local above = pos + blockgame.vector.dirs.up
-		if minetest.get_node(above).name ~= "air" then return false end
+		local above_name = minetest.get_node(above).name
+		if above_name ~= "air" and not blockgame.item_matches(above_name, sapling_can_replace) then return false end
 
 		return true
 	end,
@@ -87,7 +91,7 @@ blockgame.register_increasing_abm({
 		-- grow out leaves to the sides.
 		local sides = blockgame.vector.get_sides_of(above)
 		for _, side in pairs(sides) do
-			blockgame.attempt_place(side, {name = leaves_growing}, {modname .. ":leaves_alive"})
+			blockgame.attempt_place(side, {name = leaves_growing})
 		end
 	end,
 })