Hi Ryan,
That would indeed be interesting, and in an old version (like, 2010 old) I tinkered with the concept of fruit entities that had color, and would evolve just like the bots. However, it wasn't very revealing, and the typical evolution patterns were always observed: the agents would see the fruit color, drive to it and eat it, and the surviving fruit with slightly different colors survived and spread. It wasn't very enlightening, but it was only one method of plant evolution. No doubt if things like "taste", "poison", spread speed, spread distance, and "fertilizer" were to be added and mutated, there would be lots of interesting developments. At the moment, however, I am more interested in the bots, and them eating each other and different types of food, but I can't speak for the rest of the devs. I'll consider some ideas with flora evolution in my next update, however.
Thanks for your interest!