I'm trying to hide an unsightly retaining wall, and curious if anyone has suggestions as to what I can plant? There is some room in a 2' wide strip above the wall for some sort of trailing/cascading plant I've debated licorice plant and ornamental oregano, or prostrate juniper or a low-growing cotoneaster (this property is in located in Oregon USDA zone 8b and I come from the SE part of the country and have limited experience with these plants here!) The wall retains a yard that kids play in, and I need something that doesn't flower and attract bees because of an allergy. Any and all help is appreciated!

Why not try ornamental grasses; Hakonechloa (macra) for instance. It has the habit of 'laying down'. An other very easy creeper would be periwinkle (this flowers though) or just plain ivy.

Why not instead plant in front of the wall. You options would be much wider with upright plants.

Creeping phlox would look good at the top also. It only blooms in the early spring then it's done for the rest of the year. Tiarella would also work. They do put up small bloom stalks but those can easily be cut down so that you only have foliage.