Posted: 16/09/2012 at 20:47
I think I'd go with planting at the top in soil and have hanging, flowering plants that you renew each year as opposed to ...ivy growing up the wall. I'm not an expert so someone might come along and say otherwise but the conditions you describe are tough so ivy would possibly survive but in troughs, you'd still have to water. I have an ivy that survives/thrives in very little, poor soil but I suspect it searches under the house and patio beyond its small bed so it is not containerised. Just my thoughts, hope it's helpful.