I am removing ferns and brambles from a steep, damp and shaded hillside. Proper planting will come later but first I want to have some ground cover that will help keep the weeds from re-establishing and help lock the slope.
I am in mid-Wales (United Kingdom) so summer temperatures are 15-20C (59-68F) and winters can easily hit -5C (23F)
I have considered Phacelia, which is quite a good green manure, but wasn't too sure if it would thrive.