Plants of the Lavandula species are highly valued aromatic plants renowned for their distinct fragrance and therapeutic properties attributed to specific elements within the essential oil.

The quality of lavender essential oils is primarily affected by the oil's unique aroma, which is defined by particular monoterpenes. This study's objective is to examine, by way of comparison, the chemical composition of the essential oils produced by the L. angustifolia `Sevtopolis` cultivar in order to draw attention to the variations that have been detected.

The experiment was carried out in both a protected (greenhouse) and unprotected (field) space. To achieve the objectives proposed in this experiment, plants of the species Lavandula angustifolia Mill cv. ‘Sevtopolis’ were used, with four experimental variants: watered with H₂O (v1); watered with standard Hoagland nutrient solution (v2); watered with Hoagland nutrient solution containing a double amount of K (v3); and watered with Hoagland nutrient solution containing a double amount of P (v4). The plant material was collected, during the flowering period, in June 2019. The essential oil was extracted via hydrodistillation according to the European Pharmacopoeia standards. The separation and the identification of the components were carried out using GC-FID (gas chromatography-flame ionization detection).

A chemical analysis of essential oils of the `Sevtopolis` cultivar has led to the identification of over 90 organic compounds. Notably, the most abundant chemicals found were linalool, accounting for 24-33.6% of the total compounds, and linalyl acetate, comprising 13-24% of the total compounds. Additional significant chemicals present in the oil's composition included lavandulyl acetate (2.6-4.3%), eucalyptol (1.5-4.9%), terpinen-4-ol (1.8-2.4%), α-terpineol (2.6-3.8%), and borneol (1.3-3.9%).

It can be concluded that the nutrient solution influenced the quality of essential oils of L. angustifolia Mill. cv. `Sevtopolis`.