The Castagné brothers produce grapes on 3.5ha on the heights of Martel, in the lot. The plots are planted on a south-west facing hillside. The vines are organic and are located at altitude in the woods, isolated. The causse being a sunny and dry region, there is very little phyto pressure, we only use organic phyto products on rare occasions. 6 grape varieties were planted: Malbec (Cahors wine variety), Pinot Noir and Syrah for red grapes; Chenin, Chardonnay and Roussanne for the white grape varieties. We work the vineyard mechanically, with a tractor without weeding. With a view to always getting closer to the natural cycle of our environment, we have set up a system of green manure that is self-sown. The harvest is done by hand, in crates. Once the grapes have gone to the cellar, settling of the whites with chickpea powder. Then the indigenous yeasts begin their work when we give them the ideal temperatures. We touch the wine as little as possible, there is only one racking. Depending on the turbidity of the wine, we carry out a light filtration on cellulose.