diff --git a/isometric-park-fna/Simulation.cs b/isometric-park-fna/Simulation.cs
--- a/isometric-park-fna/Simulation.cs
+++ b/isometric-park-fna/Simulation.cs
@@ -61,9 +61,9 @@
         private const float NEIGHBOR_NEW_TREE_CHANCE = 0.995f;
         private const float NEIGHBOR_CROWDS_TREE_CHANCE = 0.995f;
 
-        private const float PRESERVE_SPONTANEOUS_NEW_TREE_CHANCE = 0.995f;
+        private const float PRESERVE_SPONTANEOUS_NEW_TREE_CHANCE = 0.9990f;
         private const float PRESERVE_NEIGHBOR_NEW_TREE_CHANCE = 0.995f;
-        private const float PRESERVE_NEIGHBOR_CROWDS_TREE_CHANCE = 0.9995f;
+        private const float PRESERVE_NEIGHBOR_CROWDS_TREE_CHANCE = 0.9990f;
 
         public const int TREE_PLANT_COST = 500;
         public const int TREE_CLEAR_COST = 250;