Moss in borders and growing on shrub stems indicates a very moist environment, high rainfall, etc. Sometimes you'll be able to improve drainage, fork over borders, and reduce the tree/branch canopy to let in more light and air. If none of this is possible you'll just have to put up with the moss!
Also would composting alone be sufficient to restore the quality of a neighbours soil that I think has suffered from coal ash being tipped on it. Nothing seems to want to grow, we have removed the ash but will it need topsoil as well as manure.
2. I have two Strelitzia, which I grew from seed from a friends garden in Thailand. I recently transfered them too a mini green house in my front garden where it gets full sun. Since transfering it, dark grey mold has appeared on the large leaves, and I also noticed a grey bug on the leaves, it looks like a mini armadillo, its 2 to 3 mille metres long, what are they and what can be done about them? Can anybody help me?