Allegheny pachysandr a is supposed to be pretty deer proof, but I notice you have a groundcover further under trees. I'd move some to your bare patch.

Yes I have IVY under the trees and Sweet Woodruff below (because it washes down the slope)....Pachysandra might be nice. Thank you

You need to to do one or more of these actions depending on the severity of your problem:

1. Raise the height of your retaining wall slightly

2. Install erosion netting & replant groundcover

3. Install small boulders to break up the water flow & replant

This is jute mesh erosion netting. It is held in place with long sod staples, which you push into the ground.

I wouldn't worry about getting blocks that aren't completely the same as your existing. Even if you had them, they would look different due to age.

An idea would be to get a complimentary block and add it as an accent to raise the wall or even rework the existing wall with additional and different block worked into the overall wall to look intentional.

The last thing you want is those trees getting roots so loosened up that the tree comes down. Been the recipient of fallen trees washed out behind me from a school yard where drainage was not addressed. Not fun.

Until the school finally addressed their issue, I put in a river rock dry creek and contouring in my own yard to direct water away from my house. It looks pretty even though I don't really need it anymore.

All the best to you.

Thank you!....I just raised the wall but I inter-dispersed the new blocks....looks OK....actually hardly noticeable. I moved some large rocks from other areas to divert the water.....I have not had a lot of luck with the netting....even when I pin it down it rolls up (down?) on me.....I will plant ground cover though (it looks bare now).....Most of the lovely groundcovers hate the shade and the roots....even Sweet woodruff only does well at the bottom of the slope. But I though Lilly of the valley might do OK (it appears to be pretty hardy ...and that will not be too bad if I try more Hosta again. (if the Deer do not demolish it ....) The pretty Ajuga and Sedums are stomped on by the Deer and I am constantly re-planting them....