I've just excavated quite a few bags of leaf mould in various vintages from a dark corner that I need for piling up prunings that I can't take to the dump. Some of it isn't ready yet (still quite leafy) but some looks remarkably like compost.
Is it best to just use it as a mulch between plants on the borders? Should I add fertiliser (I think I've got some slow release granules) before, or mixed in.