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The results showed that the essential oil content of dragonhead (Dracocephalum moldavica L.) and its constituents were significantly affected by sowing dates. The highest oil content (3.2 %) and the lowest one (2.3 %) were obtained as a result of sowing on 20 of April and 5 of March respectively. The results of GC and GC-MS analysis showed that the essential oil constituents were affected by sowing dates. Eighteen components were identified from the oil of plants which were sown on 5 of June but nine to twelve components were analyzed from the essential oils of plants which were sown from 5th of March to 20th of May. The highest amount of geranyl acetate (50.1 %), geranial (25.3 %), neral (19.3 %) and geraniol (28.8 %), were obtained from the plants sown on 5th of May, 5th June, 5th June and 20th of March respectively.
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Omidbaigi et al. (2009) studied this question.
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