Chris Barth looks after 7 hectares of vines around the town of Azley in the Rheinhessen. This is a region of rolling hills where vines share the land with many other crops, a contrast to other regions such as the Mosel and Rheingau, where  vines are virtually a monoculture. The varied soil types and favourable climate means the Rheinhessen is home to a wide variety of grape varieties.