Topping
Mulch in spring with well-rotted organic matter.
Applying a mulch in spring will help conserve moisture throughout the dry summer months. It will also provide a low level of nutrients as the mulch decays. The best mulch is well rotted organic matter, your compost heap is a good source of this.
During freezing weather in winter, heucheras can sometimes lift out of the soil leaving gaps around the shallow roots. A spring mulch will not only help to prevent this but it will fill in any gaps around the crown. Do not mulch the centre of the plant, this could cause the crown to rot.