I disagree with one of the post telling you to chage the grade of your bank. I would either plant grass as Bob says are consider adding stone. I have landscaping stone on the steep banks with some larger rock intermingled and even a few boulders. If I had to do it all over again though I would put plastic under the stone as I do have some pesky weeds coming up through the stone form time to time. However for the most part it looks good and stops erosion.

I know those who use limestone but I personally don't fine limestone very attractive vs. natural stone.

If pigs could fly bacon would be harder to come by and there would be a lot of damaged trees.