Here's the render of the #geometrynodes tree! Will add some node screenshots and maybe some explanations as well. #b3d
First a basic node group. It takes a Curve Line and attaches two more Curve Lines on the End Point of the original. See en.wikipedia.org/wiki/L-system for more! 
Since we don't have a way to iterate in a easy way we just chain a bunch of L-System Groups one after another. I vary rotation and scale and calulate the curve radius. I chained 5 Iterations together. So I can iterate in steps of 5. This makes it a little easier later.
Then I combine it all. Red and light red frames are 5 L-System iterations and the original stem. They build the main tree. Blue Frame is the Roots, green is leaves, orange is berries, cyan is moss. It's a mess, even with nodegroups and frames.
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