erosion control plants for shade
I am trying to help my dad with erosion around a small stream (about 6-10 ft. wide, 6"-2.5' deep, concave embankment rises 4-6' above stream) in his backyard. The soil is mostly clay, with some sand and loam, and the concavity of the banks, presumably combined with growing (heavier) trees along those banks, is leading to trees leaning across the creek as their support washes out from under them, and as they themselves get heavier.
Some trees have been removed this year, but it's partial to full shade, although not extremely dense full shade, if that makes sense.
Can anyone suggest aggressive-rooting erosion control plants--groundcover, bushes, etc., but probably not large, heavy trees--that might help? Thanks,