I have a tough area to landscape right along a semi busy road. The area is about 100 ft long and 11 feet wide. The area also has a decent slope to it. The homeowner wants something low maintenance there that isnt grass or mulch. In the past the mulch has washed away and the grass just wont grow. In the winter sand and salt gets spread in the area. I was thinking riprap, but selling 25ish yards of material for that small of an area might be tough. Any other ideas?