Answer: An organic mulch is a good idea because it helps maintain soil moisture, keeps down weeds, helps hold the soil in place and also feeds the soil as it breaks down. On a slope, it seems to stay in place better if you use the larger, heftier chunks of bark. ( Sometimes these are "pine nuggets", but whatever is available locally should be fine.) They also look tidy and last longer than smaller pieces of bark or the very fine mulches such as cocoa shells.
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