For many oily rag gardeners’ comfrey is an essential part of their gardening regime. The leaves are rich in nutrients and break down quickly in a compost bin. To make a comfrey fertiliser soup, half fill a container with comfrey leaves and top it up with water. Cover and let it brew for a month or so. It’s quite powerful so dilute it before applying to plants. If you plant comfrey under fruit trees, it will draw up nutrients from deep within the soil.