Made with a mix of my own photogrammetry, procedural generation, and hand modeling.
I should really be commenting these graphs if I want non-substance designer folk to be able to read them..
First we create the individual clover.
Then the stem
Finally we create minor variations of the petal's shape and coloring. and atlas everything together. I created a custom material warp node to keep this graph more clean and readable.
Left to right: roughness, albedo with alpha, normal, height, mask. Additionally AO and a few packed versions can be output as well.