The aim of the present study is to evaluate the effect of growing media on the amounts and chemical composition of the essential oils of two different species of Achillea eriophora and A. wilhelmsii. The essential oil obtained from these plants growing wild and under cultivated conditions was analyzed by gas chromatography (GC) and gas chromatography-mass spectrometry (GC-MS). The results showed that essential oil yield of A. eriophora when grown in wild and cultivated conditions were 2 % and 2.25 % (v/w) respectively. Camphor (30.4 %, 29.98 %), 1,8-cineole (25.24 %, 26.98 %) and camphene (6.21 %, 5.98 %) were the major compounds identified in the essential oil of A. eriophora grown in wild and cultivated conditions respectively. The oils yield of A. wilhelmsii was 0.65 % and 0.5 % (v/w) when they were grown in wild and cultivated conditions respectively. The major components were camphor (19.66 %, 25.26 %), 1,8-cineole (9.06 %, 5.77 %) and α-pinene (10 %, 7.93 %) when the plants grown in wild and cultivated conditions respectively.

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