What is the fine-grained topic of the following text: Grape growing is in Maillart’s blood and he came back to the family estate in 2003 after graduating university, “When I completed my studies, I knew I wanted to create wine with my own identity.” Champagne Maillart is certified with the HVE (High Environmental Value) rating and uses both biodynamic and organic methods. Only return the topic.
Maillart's approach to grape growing and wine production