I don't think the wall looks bad but then I'm not living with it. Having the sun blocked would be my greater concern.

Any vine -- creeper -- you have climbing the wall would likely climb the trees and choke and disfigure them and end up giving you an unkept and cluttered look.

You might want to talk with a pro about the trees. They're planted close together to create a hedge but, by doing so, the trees crowd each other. It may not always happen but I've seen such tree hedges begin to die and the adjacent trees left misshapen as the trees get older. It may be that you could, in fact, top the trees at your preferred height and create a shorter hedge -- it would be worth asking a pro about that.

Also ask the pro what hedge you might plant to replace them if you opted to remove the trees. If you're in Georgia, I'd suggest you consider aucuba bushes which are attractive and low maintenance and keep their leaves year round and can grow 6' - 8' high.
Building code permitting, of course, replacing the trees with a fence or trellis to be covered in English ivy, which would also cover the stone wall, could be something to consider but ivy does take a while to grow and can be invasive.

@suezbell. Thanks for your advice but these hedge trees are really tall, taller than my roof top in order to block the sight of my neighbor. My neighbor's house and our house are very close and they sit higher than us, only hedge would be working to block the view. A regular fence height would not work unfortunately. And the wall is pretty long, about 65 feet. It would be very costly to remove the trees as well.

Try growing plants in the cracks : succulents, flowering annuals that are tolerant of heat and drying, perennials like Heath.
You can also turn one of the rock walls into a water fall.

@ayun Thanks for your advice! Interesting idea! Can you tell me a little bit more details? How can you turn a rock wall into a water fall?

Hire a landscaper that specializes in water feature. They would created a small trench behind the rock wall and run piping and a pump tubing behind it. Then dig a small pond or gravel pond in front of the wall to allow the water to recirculate back into the pump. A good specialist can wire electrical into the house so you can turn the pump on whenever you want, adjust water flow, create mood lighting so it can also be enjoyed at night

Definitely a water feature would soften it and bring together all the nature great idea

Part of the problem is the lack of transition. The beautiful stone wall very abruptly meets grass. Adding softly curved beds in front of the wall would help. Anchor with a few trees, shrubs of varying heights and under plant with flowers. The yard needs softening lines. Don't worry about the top of the wall. After planting the beds the wall will become a lovely background.

I agree with Beseaside. What zone are you in? Camellias will grow in shade and they can get tall.

Woodland plants

Backdrop for garden beds

Espalier something on the wall

Plants between wall and trees

Hi there

I like this wall - it's the trees I have a problem with but understand why you might need to keep them. I think if you can find plants that grow in the crevices of the wall (trailing flowering plants for example and little succulents) it would soften the wall. I would also plant in front of it - a border full of flowers would transform it. You could also consider solar powered (or other) lighting for the evening so that the wall gets lit up and becomes something charming to look at - especially with a water feature it would be great. You could break up the wall by having a mosaic artist create some mosaics on a few of the larger rocks that make up the wall. think about wildlife - a bird feeder maybe - anything that turns it from an eyesore into something you start to love.

yeah, plantings around and on the wall -- if you think of it as a rock garden, you will find that there are groundcover-style plants that will happily convert it into a pleasant sight, especially when combined with a mix of plants along the base.

You could put a fence in front of it since it looks like there is some in the side yard however its really expensive so doing some vines etc could make it look better for less.

I agree the wall is not so bad. I like this ground cover idea, and really love the idea of a water feature with lighting you can turn on for evenings. Maybe do both, a pond feature in the middle of the wall that is most visible from the dining area and ground cover landscaping along the rest of the wall.

Phlox at top of the wall that will grow to drape over the side

Grow hens and chicks in the wall. Add soil to cracks and plant.

I wouldn't do a fence because I think that rock retaining wall is much more attractive than a fence would be. Beseaside nailed it - work on the landscaping on top of the wall and before the trees.

Love the little buxus hedge and seat, on a smaller scale. Could plant the grasses, morning light, or similar, above the wall. Add a big pot or garden art among the grasses

Espelier is quite easy to do, pics below are star jasmine and a Camilla

Camellia lol, I should say

Ass wall creepers, trailing rosemary, wild roses, other flowering busges, maybe an herb garden. Seems willow or pepper tree with trailing branches will work.

Sounds like you're not willing to wait for something to grow tall, so you need a solution that covers much of the wall in a short time. In that case I'd take the approach of growing something up the wall from the bottom, either a fast growing perennial vine, and even some very tall annuals in the first year until everything else is larger. Also plant something at the top of the fence that will trail over. Something green all year. What zone are you in?

And I would also fill in the larger gaps in the stones with soil, planted with succulents. Great idea.

Also plant a small tree or large shrubs, about 5 ft away from the wall. It will fill in fast and attract the eye.

Hey, just seeing this and wondering what you did about the stone wall?! Did you go for the water feature or the camelias or the succulents or some mix of all?! I'd love to see some update photos (and bet I'm not the only one!).