Tree represents a number of trees per ha (Weight), with identical species, age etc. A tree is the object upon which most Production Model functions works on. Each tree has a complete history, showing its age, weight, diameter etc. in different time periods. Each tree is responsible for calculating its own growth from one period to another, but in order to do so the expected growth and mortality must have been assigned by client objects (typically objects in the production model).

'Declaration
 
Public NotInheritable Class Tree 
   Implements ITree 

'Usage
 
Dim instance As Tree

public sealed class Tree : ITree  

public ref class Tree sealed : public ITree