Hello! I have tried valiently to grow 2 climbing rosebushes in very big terracotta pots which I had delivered from the UK, but they seem to have had every blight there is: spidermites, no flowering, yellow leaves and now some kind of powdery mildew. I have sprayed them with Neem oil, very diluted washing up liquid, fed them, etc, etc, but still they look pathetic. I have cut them down twice now and this is year 3 and still no flowers and sick-looking leaves. It is not particularly windy on our patio, but overnight we have a this layer of dust to get rid of. Is this the problem? We have sun for half of the day, and I made sure the roses are in the right position to make the most of this. I have fed them and cosseted them, and I'm resigned to pulling them out. Before I do this, does anyone have any ideas? The name of the rose is "Mortimer Sackler", which is supposed to be tough and disease-resistent. Alternatively, does anyone know of a gardener we could pay to have a look at them? (Portuguese or English). By the way, we have a nice Mandevilla growing up a wall, and it too is beginning to get a powdery, yellow look. Help!