Do you lift your dahlias or cut them down and mulch them? It depends on the growing conditions and weather. Soil type and temperatures are the deciding factor - heavy, wet soils can cause dahlias to rot over winter, dahlias will also rot if they freeze. Often, mulching isn’t enough and it is less risky to lift, dry and store them. You can leave it until the first frost, but we always make a start in early November to clear space for planting tulips and other spring bulbs. We’re starting with the