I have a new customer that has a steep hill(55-60 degree bank) that currently is covered in grass. It covers about 5k feet. Due to the labor intensive method of weedeating it every time, they are wanting to replace the grass with ground cover. What is best for this? I was thinking some sort of ivy but I do not know much about what type. The hill is somewhat shady. Also when the cover is planted does the grass need to be killed off first or will it be overtaken eventually? Thanks for your help.There is only 1 landscape contractor in town and they are booked for weeks on end.