Redwing has a point. There are a great deal of ground cover shrubs that would fit the bill and give a bit more interest, plus they might do a better job of consolidating the bank and keeping the weeds down. Heather would be worth considering. i know it’s not answering your question but just saying.🥴
If you rewild you can cut it by tying a rope to the handle of your lawn mower for dropping it down and pulling it back up the slope. A cheap flymo would do the trick.
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i know it’s not answering your question but just saying.🥴