You can never have too many trees on a layout... Pine trees, eucalyptus trees, palm trees, apple trees... all sorts of trees made using natural material as well as commercial trees and wire trees.
Scenic elements that make the base texture of your scene, basically the first layer of scenic material that will be applied before adding trees and other larger pieces of scenery.
The most notable scenery on most layouts are the man made elements that add life and attraction to a layout. If the details are made and placed well they almost go unnoticed.
