This document presents the TREEOR model, an approach to valuing intellectual capital based on an analogy with how trees grow. The model explains organizational growth as a consequence of its intellectual capital (represented by root growth), knowledge consumption (like nutrients), and learning (represented by soil fertility). It defines the key elements - intellectual capital, organizational learning, knowledge, environment, strategy, and culture - and how they relate to tree and organizational growth. An example using real data is provided to demonstrate applying the valuation model.