Landscaping

How to build a tree:

1. Add a cylinder. 

2. Press the S - Key for scale.  Shrink the size of the cylinder so it looks like a tree trunk. 

3. Use the blue arrow to bring the cylinder down to the level of the houses. 

4. Go into Edit Mode. 

5. Press the A - Key so nothing is selected.

6. Press the B _ Key so you can select the top of the cylinder. 

7. Let go of the mouse click so the top of the cylinder is selected. 

8. Use the blue arrow to bring the cylinder up into the shape of a tree trunk. 

9. Go to object mode. 

10. Add an Icosphere. 

11. You will need to move the icosphere on top of the trunk.  Use the S - Key to make it smaller too.  It should look like this. 

I added color to mine and used the fractal modifier.