Chateau Guiraud

Geology and pedology

Geology and pedology

The vines grow on extremely heterogeneous soils and subsoils: sandy gravel makes up to 80% of the soil, the rest consists of deeper layers of a mixture of gravel and clay.

Subsoils show variation, from translucent sand to pure gravel layers that alternate with masses of red clay, but also marl and limestone, calcified oyster layers, red and white clay.

Excessive rains can cause the vine to suffocate if its roots bathe in the water trapped between clay layers. Therefore drains are digged 60 cm deep in the ground before the new vines are planted.

This way the water flows through the drains to large ditches.