Juniperus communis, Hedychium spicatum and Valeriana jatamansi are important medicinal and aromatic plants from north-wester Himalayas India. The essential oils (EOs) composition, isolation of new molecules and biological activities (cytotoxic and antibacterial) were carried out on targeted plants. HDA application will enhance the net return of EOs of V. jatamansi (425.54 to 459.59 USD/kg), H. spicatum (69.07 to 77.71 USD/Kg) and J. communis (96.26 to 101.74 USD/Kg), respectively, compared to NC (normal Clevenger apparatus). The results showed that HDA method is economically more suitable as...