Cultivar-Dependent Effects of Basil–Common Bean Intercropping on Mineral and Lipophilic Antioxidant Composition

Intercropping can affect nutrient availability and plant biochemical composition, but information on these effects in medicinal and aromatic plants is still limited. This study evaluated the effects of intercropping with common bean (Phaseolus vulgaris L.) on mineral composition, carotenoids, and tocopherols in two basil (Ocimum basilicum L.) cultivars, ‘Genovese’ and ‘Sweet basil’, grown at different basil–bean ratios. Intercropping significantly affected all analyzed minerals, although the response differed between cultivars for several elements. ‘Genovese’ showed increases in Zn, Mn, and Cu, while Zn content in ‘Sweet basil’ remained relatively stable. In contrast, N, P, and Fe concentrations decreased in some treatments. Total carotenoids and total lutein decreased under intercropping in both cultivars, whereas β-carotene responses were less consistent and depended on cultivar and intercropping ratio. In contrast, total tocopherols and α-tocopherol generally increased under intercropping. Zn, Mn, and Cu were negatively correlated with several carotenoids but positively correlated with tocopherols. PCA separated monocropped from most intercropped samples and showed that both mineral and antioxidant variables contributed to sample differentiation. These findings show that the compositional response of basil to common bean intercropping depends on cultivar, intercropping ratio, and the group of compounds considered.