I spent a few hours working on the shader for this plant. I am not a 100% happy with the final image as I think it is possibly slightly too glossy. This was rendered in Mental Ray and took just under half an hour on my 16Gb i7 2600k computer. Still, as it was late at night and I didn’t have any proper geraniums to look at, I wasn’t quite sure how shiny the leaves and flowers were, so I took a (semi) educated guess.
Still, I am getting better at doing the shader networks for vegetation slowly.