Answer: Erosion control is sometimes a difficult proposition. There are several groundcovers that might suit your purpose. Ajuga, Rockcress, Manzanita and Carex (New Zealand Hair Sedge) are first choices. Ice plant, Wild Buckwheat, Acacia redolens, and Gazania would also grow well once established. Why not check around and see what other plants are growing in your area? Perhaps you'll see something you like even better than the above suggestions.
As for the screening hedges, how about Oleander, Glossy Abelia, Barberry, Natal Plum, Euyonmus, Leptospermum (tea tree), Escallonia, Ceanothus, or Nandina?
Q&A Library Searching Tips