I called around, trying to find the exact right kind of mulch for the slope. It couldn’t be wood chips, because they’d just wash away in the rain. It couldn’t be fine pieces, either. Instead, I found the biggest, most irregular pieces of bark, that would sort of hook onto each other, and stop from sliding down. It was hard to find mulch that hadn’t been treated with color, for a reasonable price.
We had an entire team of guys come over and help us plant all the plants we ordered, and also do some weeding and mulching.
It almost looked toomanicured. I actually prefer a more naturalistic design. But at least the knotweed was being kept at bay (not to mention the bittersweet, multiflora, tartarian honeysuckle, autumn olive, grapevine and spurges).