Help with Drainage Problem
We have established a large garden area around two large Beech Trees. We've planted many ferns in the shaded area. In order to keep the weeds out we laid down landscaping weed control rolls then covered all that with mulch. The area is on a slope and every time we get hard rains the mulch runs down the slope and exposes the material underneath as well as piles up at the end of the slope. We've cut a significant rim around the area to try to hold the mulch but this does no good. We also have a gutter drainage pipe with a plastic extender that we directed toward the ferns but this adds to the flooding of the area, so I re-directed that away.
Any suggestions would be appreciated.