I wouldn't mind having a better look at that wall before suggesting something with a lot of root mass, like daylilies or shrubs. There is not much lean on that wall and pressure from within is the last thing you want. I've been poking around my rock walls and garden lately and have noted how much root mass is tending to migrate to areas of consistent dampness. For example, I have a pot standing next to a plant that has a bulky root mass, and although the plant can grow best where there is light, the woody base has pushed itself under the pot. Quite intriguing. In your situation, this tendency is aggravated by the downhill slope, which is where water, and thus roots, will go. Therefore a plant that spreads by stolons would probably not grow uphill, but you may not want to risk it - so none of your Houttuynias or St. John's wort, for example. Something that mats, in contrast, could easily by mowed by the neighbour (or their mowing people). A couple of matting plants that I have had good success with are a spreading veronica (note to self and others: do NOT google "spreading veronica") and a matting dianthus with bright pink flowers. Not sure how they would handle full sun in your climate, but the moisture retention of the rock would help. I think the thymes would be OK too. Which way they spread would partly be determined by the sun - they would grow primarily toward it. I agree that the sedums are not as weed-suppressing as you might think. One that might be would be Sedum 'Angelique', and there are others. Sedum acre would probably also work - but as Yardvaark's description of how to root it suggests, it is rather easy to propagate and so your neighbour's mowing might get it all over her yard - so easy to miss a bit that falls. 'Angelique' will also root where it drops, but because it's bigger and not as fragile it is easier to control the bits. All ground covers need periodic haircuts to avoid getting leggy, woody, and sparse. KarinL

mmmmmmmmmmmmmm..well.....thanks georgez5il for taking the time to reply.....guess I will get seed somehow :) Thanks again

A - I believe is a variegated crassula of some sort, can't remember the actual name B - Crassula Perforata "string of buttons" C - Sedum Rubrotinctum "pork and beans" aka jelly bean plants - these guys turn sunset red under prolonged sunlight exposure. I love them, the leaves fall off very easily, and I usually just leave them in the same pot whenever they come off. A week later, the fallen leaves all rooted!

Helen, the above plant is Sedum morganianum. and like rina posted it's common name can be burros tail or donkeys tail. I've always like the colorful common names but if you own more than a few plants you really need to use the horticultural name, I'm not sure what your second question is. To make a easy succulent mix you can add pelrlte to a commercial cactus and succulent mix.