diff --git a/agent.cc b/agent.cc
index a1a401f..da51732 100644
--- a/agent.cc
+++ b/agent.cc
@@ -181,6 +181,14 @@ agent::~agent()
 }
 
 
+void
+herb::die(void)
+{
+	/* No corpse, just clean up tile. */
+	tile->on_agent_leave(*this);
+	tile = NULL;
+}
+
 static void
 spawn_herb(class tile &t)
 {
@@ -211,8 +219,7 @@ herb::on_tick(void)
 		spawn_herb(tile->tile_in_dir(0, 1));
 		spawn_herb(tile->tile_in_dir(-1, 0));
 		spawn_herb(tile->tile_in_dir(0, -1));
-		tile->on_agent_leave(*this);
-		tile = NULL;
+		die();
 	} else {
 		smell_herb(tile->tile_in_dir(1, 0));
 		smell_herb(tile->tile_in_dir(0, 1));
diff --git a/agent.h b/agent.h
index aa59e0a..f0bdfab 100644
--- a/agent.h
+++ b/agent.h
@@ -43,7 +43,7 @@ public:
 	bool secrete(int id, double intensity);
 
 	void chenergy(int delta);
-	void die(void);
+	virtual void die(void);
 
 	void on_action_takes(void);
 	virtual void on_tick(void);
@@ -63,6 +63,7 @@ public:
 		energy = world::herb_energy;
 	}
 
+	void die(void);
 	void on_tick(void);
 private:
 	void smell_herb(class tile &);