building a stone retaining wall garden against a wooden fence?
I am in the process of building a retaining wall garden in the back corner of my yard. The retaining wall will be at some places 3 feet tall, and once complete the soil will be resting against the wooden fence in that corner of my yard. having the soil just rest against my fence would be a horrible idea, it would rot the wood, and the second it starts raining it will all wash out behind the fence. What would be a good and cost effective material to build up against the fence to prevent the soil or runoff water from contacting the fence? I was looking at the 'concrete board' which is used to go under kitchen counters and such, would this do? if not is there a readily available plastic sheeting or something which could be used? or should i just start buying brick and mortar and start building a wall bordering the fence (i would prefer to avoid this if possible).
thanks for any input