Marketing in Berkhamsted, Hemel Hempstead and Tring. Evergreen Marketing uses latest digital media to provide the best marketing to Berkhamsted and also Tring and Hemel. Although digital media is often over used, digital media is the best way to attract new customers or make outstanding marketing presentations. Evergreen marketing is based in Berkhamsted and provides graphics, illustrations, software development to a range of clients in and around Berkhamsted, Hemel Hempstead and Aylesbury.