Organic knowledge is cultivated through lifelong experiences, interests, and trials of a creator. Organic knowledge is characterized by its connectedness. It's easy to understand and can be easily applied across related fields.
If you cannot explain it simply, you don’t understand it well enough
Richard Feynman’s recorder series, Fun to Imagine is my favorite example of organic knowledge. He explains some physics concepts that I previously knew in a narrow, disconnected, partial, and technical manner, using the simplest terms. Feynman is the epitome of taking an organic approach to learning. As a physics student, he would go to freshman students to explain complex problems using only the simplest terms, rather than focusing on memorizing theories from textbooks. He believed that understanding complex issues in this way would lead to higher-quality conclusions.
I took this term from Paul Graham and his essay Organic Startup Ideas "There are two types of startup ideas: those that grow organically out of your own life, and those that you decide, from afar, are going to be necessary to some class of users other than you". He also says that most successful startups they help grow in Y-Combinator were based on organic ideas.