The morphogenesis in plants is a fascinating phenomenon: plant shape is a results of genetic and environmental cues generating beautiful geometry that could be described mathematically.

The golden angel of the position of the lateral organs (Phyllotaxis) is one example (http://www.lps.ens.fr/~douady/PhyllotaxisIndex.html; https://www.youtube.com/watch?v=FOuoJVZqUV8 ) another example are the lobes of pavement cells (https://www.botany.one/2014/02/pavement-cells-living-puzzle/ , link to paragraph).

Ultimately, if you want to understand morphogenesis you need to untangle the mystery of plant growth. A mystery crucial for humanity which has been cultivating different crops for thousands of years. 

Since the Neolithic farmers humanity have been selecting plants based on their growth capacity to maximize the yield. Competing theories for the growth process are presented regularly but none of them manage to present a convincing complete vision of this process.