Fixed setting of matplotlib axis labels

holoviews/plotting/mpl/element.py

@@ -149,15 +149,15 @@ def _finalize_axis(self, key, title=None, dimensions=None, ranges=None, xticks=N
         axis = self.handles['axis']
 
         subplots = list(self.subplots.values()) if self.subplots else []
-        if not self.overlaid and key is not None:
+        if self.zorder == 0 and key is not None:
             if self.bgcolor:
                 if LooseVersion(mpl.__version__) <= '1.5.9':
                     axis.set_axis_bgcolor(self.bgcolor)
                 else:
                     axis.set_facecolor(self.bgcolor)
 
             # Apply title
-            title = None if self.zorder > 0 else self._format_title(key)
+            title = self._format_title(key)
             if self.show_title and title is not None:
                 fontsize = self._fontsize('title')
                 self.handles['title'] = axis.set_title(title, **fontsize)