Posted: 27/08/2017 at 20:55
Let the stems blacken, which they will at the first frost, then remove the old growth and do the mulch thing (or lift the tubers and store them). If your neighbour's plants are surviving well with just a mulch for protection, then I'd go with that. No, the mulch can stay - it'll just rot down and become a nutrient release for the plants. However, don't rely on that for food. They will benefit from a top dressing of good compost in spring (not too rich, that can cause yellowing and weak growth) and a high potash feed when buds start to show.