I used these bunches for building all the grass in this scene, and combined these bunches and changed colors for some variation. The flowers and nettles were simply modeled, whilst the leaves were modeled strictly following texture.

For the trees, I used the great Onyx Tree, I used only the branches with some modeled leaves and then built up several more to create the trees. For the ferns, I used palm leaves from Onyx Tree. For the leaves and stones on the ground and stairs, I used scatter and then corrected
their position. Then I added some little bits detail like water drops on the leaves and the grass.

For the vegetation I used sub-surface scattering, I spent a lot of hours to setup correct SSS (Sub Surface Scattering), but I managed it.

Here are some examples of the vegetation.