diff --git a/src/Field.py b/src/Field.py
index 89735257..65096105 100644
--- a/src/Field.py
+++ b/src/Field.py
@@ -84,5 +84,6 @@ TREE = 100
 
 SHORT_VALUE = 1
 TALL_VALUE = 100
-TREE_VALUE = 100
+TREE_VALUE = 200
+FLOWER_VALUE = 1
 
diff --git a/src/GeneticAlgorithm.py b/src/GeneticAlgorithm.py
index d17d3c95..e2d491ec 100644
--- a/src/GeneticAlgorithm.py
+++ b/src/GeneticAlgorithm.py
@@ -154,8 +154,10 @@ class GA:
     def perform_mutation(self, individual):
         # Perform mutation operation on the individual
         index1 = random.randint(0, num_of_trees - 1)
-        index2 = random.randint(0, num_of_trees - 1)
-        individual.genes[index1], individual.genes[index2] = individual.genes[index2], individual.genes[index1]
+        new_x = random.randint(0, tilemapSizeX-1)
+        new_y = random.randint(0,tilemapSizeY)
+        if (new_x,new_y) not in individual.genes:
+            individual.genes[index1] = (new_x,new_y)
 
     def run(self):
         self.initialize_population()