diff --git a/src/state.rs b/src/state.rs
index 4070cb1..b74444f 100644
--- a/src/state.rs
+++ b/src/state.rs
@@ -44,7 +44,7 @@ impl CellData {
             CellKind::Sea => [0., 0., 1., 1.],
             CellKind::Plain => [0., 1., 0., 1.],
             CellKind::Beach => [0.82, 0.84, 0.51, 1.],
-            CellKind::Forest => [0., 0.5, 0., 1.],
+            CellKind::Forest => [0., 0.5 - (self.moisture*0.4), 0., 1.],
             CellKind::Dirt => [0.53 - (self.moisture*0.4), 0.38-(self.moisture*0.4), 0.29-(self.moisture*0.4), 1.],
             CellKind::Stone => [0.5, 0.5, 0.5, 1.]
         }
@@ -152,7 +152,6 @@ impl State {
                 }
             },
             Event::WindowEvent { event: WindowEvent::CursorMoved { position, .. }, ..} => {
-                dbg!(&position);
                 let w_size = window.inner_size();
                 let pos = Point {
                     x: ((2.*position.x/(w_size.width as f64))-1.)*(self.uniforms.camera[2] as f64),
@@ -162,9 +161,9 @@ impl State {
                 if self.mouse_pressed {
                     for i in c.iter_path(pos) {
                         self.selected_tile = i;
-                        let c = &mut self.map.cells_data[self.selected_tile];
-                        if let CellKind::Dirt = c.kind {
-                            c.kind = CellKind::Forest;
+                        let cd = &mut self.map.cells_data[self.selected_tile];
+                        if let CellKind::Dirt = cd.kind {
+                            cd.kind = CellKind::Forest;
                         }
                     }
                 } else {
@@ -184,8 +183,8 @@ impl State {
         self.vertices = Vec::new();
         self.indices = Vec::new();
 
-        for (c, data) in self.map.voronoi.iter_cells().zip(self.map.cells_data.iter()) {
-            let mut color = data.color();
+        for (c, cd) in self.map.voronoi.iter_cells().zip(self.map.cells_data.iter()) {
+            let mut color = cd.color();
             if c.site() == self.selected_tile {
                 color[0] = (color[0]+0.4).clamp(0., 1.);
                 color[1] = (color[1]+0.4).clamp(0., 1.);
@@ -194,7 +193,7 @@ impl State {
             let vs = c.iter_vertices().collect::<Vec<_>>();
             let i = self.vertices.len() as u32;
             for v in vs.iter() {
-                self.vertices.push(Vertex { pos: [v.x as f32, v.y as f32, data.z], color });
+                self.vertices.push(Vertex { pos: [v.x as f32, v.y as f32, cd.z], color });
             }
             for v in 1..(vs.len()-1) as u32 {
                 self.indices.push(i);
@@ -209,7 +208,24 @@ impl State {
         }
     }
     pub fn update(&mut self) {
+        let mut rng = thread_rng();
+        let mut new_forest = Vec::new();
+        for cd in self.map.cells_data.iter() {
+            if let CellKind::Forest = cd.kind {
+                if rng.gen::<f32>() < (0.03*cd.moisture) {
+                    let c = self.map.voronoi.cell(cd.cell);
+                    let n = c.iter_neighbors().choose(&mut rng).unwrap();
+                    new_forest.push(n);
+                }
+            }
+        }
+        for i in new_forest {
+            let cd = &mut self.map.cells_data[i];
+            if let CellKind::Dirt = cd.kind {
+                cd.kind = CellKind::Forest;
+            }
+        }
+
         self.frame += 1;
-        
     }
 }
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