Our guide Nuno Roxo introduced us to a local plant man, who produces essential oils in a small village, Corte Sines in the hills near Mertola. He took us to a location near the river (Guadiana) where they harvest herbs for their business. These are the main herbs they use: Cistus ladanifer Lavandula stoechas, pedunculata and viridis, Rosmarinus officinalis Thymus mastichina Fueniculum vulgare Helichrysum stoechas Eucalyptus globulus Mentha pulegium Ruta graveolens