Within the different communes of the Barolo zone, stylistic differences emerge due to differences in soil type. The calcareous marl soils of Barolo and La Morra are relatively fertile and tend to produce softer, more aromatic and fruity wines that age relatively sooner than Barolos from other parts of the zone. The less fertile, sandstone soils of the Monforte d'Alba and Serralunga d'Alba commune produce more intense, structured wines that need more time to mature. Castiglione Falletto is located on a spur between the two valleys with overlapping soil types. This region tends to produce wines with elegance and aromatics of the Barolo commune and the structure of wines from Serralunga d'Alba.