There are dirt patches that everyone starts out with that you cannot remove. As for grass deterioration, I'm not completely sure how to bring it back. Planting flowers on it never worked for me but not running over it helps. Also when it starts to snow all of it will come back.I always run unless I'm near my flower fields, but reading through the thread everyone keeps mentioning dirt and worn grass and deserts...
I have a bunch of dirt patches all over my town, most there from the day the town was created, and now I'm afraid they'll be there forever?? I thought that planting flowers on the dirt and watering them would help the grass to grow, am I wrong?