I don’t know how I forgot about this one: “The Algorithmic Beauty of Plants” by Prusinkiewicz and Lindenmayer. 

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Software engineer, creative coder, aspiring generative artist, fridgebuzz.tez/.eth

I had this book as essential reading for my students in Algorithmic Design course.

It is not easy though, the syntax they use is formal shape grammar. Very compact, but it needs practice to get used to. I think most of my students didn’t understand how it really works, although we did examples with Python.

Computational architect. Some structure, mostly chaos. Co-founder {protocell:labs}

https://github.com/protocell-labs

I’ve never tried using their ideas. I didn’t have the means or the time (one or the other—it’s always one or the other) at the time, most likely.