We purchased an older home and uncovered beautiful stairs behind the house on a steep hillside with a low stone retaining wall at the bottom. The landscaping was all overgrown and soil was washing out the steps. These steps are made with railroad ties and have a slate paver in each step. My question is: Should I dig down below the steps riser close to the foundation so that the soil cannot come over the steps? Or, should I install a french drain to help direct the run off? We live in NH which has some pretty tough winters with some good snow amounts.
Also, what plants do you suggest for NH that would have a good root system to help hold the soil?
P.S.: Great website.