Here is the process of modelling one of the plants. I only used spheres and planes to get the desired result. I ended up having two versions of the model, a lower poly version and a higher poly one. I used a cage to bake the details, however, at the beginning I had some problems as the program would bake the planes/leaves (which are low poly to begin with) on parts on which they shouldn’t be. I ended up making two special versions of the models (low and high poly, both without leaves/planes), after which I had no more problems with the baking. The only issues in the maps afterwards were created by where the objects were joined together, which I simply fixed by editing the pictures.