Let me present, in 5 steps, how to quickly model a garden at this real place from Google Earth.
The example is simple because the terrain is flat and the house is square.

Step 1 : Display the garden in Google Earth
In Google Earth, fly down close to the location where you want to place your model (looking straight down).

 

The garden in Google Earth

The garden in Google Earth

Step 2 : Get current view in SketchUp
In SketchUp, click the Get Current View button to take a snapshot of the terrain that is displayed in Google Earth (the button looks like the Google Earth icon with a yellow arrow pointing right).

 

Get current view in SketchUp

Get current view in SketchUp

Step 3 : Draw the house over the image
If necessary move the axes, draw a square at the good place and use pull tool to make a cube.

 

Draw the house over the image

Draw the house over the image

Step 4 : Trace the contour of the terrain
With the Line tool, trace the contour of the terrain.

 

Trace the contour of the terrain

Trace the contour of the terrain

Step 5 : Add some details
Trace the contour of the hedge, pull up and fill in with texture.
Import a tree.

Finally, for a more realistic view, don’t display the edges, and activate shadows displaying.

 

Add some details

Add some details

You can use the Place Model button to place this model in Google Earth.