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According to the AFNOR norms, essential oils are ONLY obtained by steam distillation (with the exception of Citrus pericarp essential oil, which can be obtained by expression). All the other products are NOT essential oils, but extracts

My experience shows that it is unproductive to fiddle with DRY leaves. During the drying process, many volatile components are lost irrevocably, and the residue obtained by steam distillation, as GC-MS shows, consists mainly of high-boiling components. For example, from 1 kg of dry sea buckthorn leaves I received only 200 mg of the mixture

hi,

first check the presence of volatiel oil in the dried leaves by its microscopial study. on confirmation then  go for clevenger apparatus extraction for volatile oil separation.

clevenger apparatus with water covering leaves (100g)

Hydrodistillation using Clevenger apparatus or microwave extraction if you can have fresh leaves of your plant.  

Hydrodistillation. Cover Your biomass with water, let it boil, condense the steam, separate the liquid layers. Dependent on oil type it will form an upper layer or a layer under the condensed water.

Thank you all of you