diff --git a/tubelib_addons1/fermenter.lua b/tubelib_addons1/fermenter.lua
index 40527be..f244f4f 100644
--- a/tubelib_addons1/fermenter.lua
+++ b/tubelib_addons1/fermenter.lua
@@ -42,7 +42,8 @@ end
 
 local function is_leaves(name)
 	return tubelib_addons1.FarmingNodes[name] ~= nil  and
-	       tubelib_addons1.FarmingNodes[name].leaves == true
+	       (tubelib_addons1.FarmingNodes[name].leaves == true or
+		minetest.get_node_group(name, "leaves") > 0)
 end
 
 local function allow_metadata_inventory_put(pos, listname, index, stack, player)