[Hamons]

I am designing the planting at the top of 4' wall made with large 18" ledge rock. A t the top I was considering a combination of blue rug juniper and climbing roses to hang over the top of the wall. Anyone ever done this before and if so -- how did it look?

[LandArts]

I'd choose blue pacific or procumbens nana over blue rug. Creeping rosemary and thyme work well.

[NCSULandscaper]

this may be something similar to what you have, these are salvaged rocks from my great grandfathers house foundation and we used procumbens nana juniper

[TrickyDick]

Yes. I thought it looked great. Although I personally hate Blue Rug and would choose a different juniper. I don't think conferta blue pacific is hardy in zone 5 but procumbens nana would be great.

[agla]

Carpet rose or a shrub rose (Royal Bonica or one of the "Knockout" varieties for example) rather than climbing rose.

Variegated winter creeper euonymus cultivars are an option. Don't be afraid of upright shrubs as this is only chest high, people are still looking down at the top of the wall.

You could use some color if you wanted to ... Lavender, hydrangeas, and daylilies. There is no single answer. I would give some thought to how the space below the wall is being used and whether you want to create privacy, take advantage of a view, or whether you want to connect or isolate from adjacent activities.

Start with the use of the area and make your plantings support and enhance that use and mitigate things around it that do not support that use. Usually, a planting has potential for much greater use than just as decoration. Try to recognize that and work with it.