Whole leaves and inflorescences of two wild strawberry cultivars ('Rugia' and 'Baron von Solemacher') harvested in 2008 during the agrotechnical experiment performed by Department of Vegetable and Medicinal Plants, University of Life Sciences in Lublin, were used as a material for determinations. Samples were collected before noon at sunny and dry days at the beginning of wild strawberry's flowering stage. Material was dried up to 35 ℃ in shadow and air just after the harvest.

Depending on a cultivar, air-dry inflorescences from wild strawberry contain from 0.21% ('Baron von Solemacher' cv.) to 0.30% ('Rugia' cv.), whereas leaves contains from 0.46% ('Baron von Solemacher' cv.) to 0.62% ('Rugia' cv.) of essential oils. GC/MS analysis of essential oils achieved from studied materials revealed presence of 70 (including 59 identified) compounds in leaves of 'Rugia' cv. and 58 (including 50 identified) compounds in leaves of 'Baron von Solemacher' cv. Essential oils from inflorescences of 'Rugia' cv. contained 52 (including 47 identified), while 'Baron von Solemacher' cv. contained 54 (including 46 identified) compounds. The chromatographic analyses by GC-MS revealed that myrthenol, nonal, linalool and phthalide dibuthyl dominated in essential oils obtained from leaves, while myrthenol, citronelol, linalool and geraniol - from those of inflorescences. There were qualitative differences between oil components at both studied materials and differentiation between both cultivars, as well.

Seeds of P. ruderale were collected from wild plants found on the campus of the Federal University of Vicosa, Minas Gerais state (Brazil), in September 2000. The seeds were cultivated in a greenhouse during the period of February to May 2001; 60 days after sowing, the leaves and flowers were collected at regular intervals of 15 days for the oil isolation.

The oil content found for the leaves of P. ruderale varied during the period of 60 to 120 days, as follows: 13.8 mg/100 g of fresh material after 60 days; 7.5 mg/100 g (75 days); 23.1 mg/100 g (90 days); 10.6 mg/100 g (105 days); 12.5 mg/100 g (120 days). The first floral buds were collected after 105 days of sowing, and its oil content was 45.1 mg/100 g of fresh material. A significant decrease in the production of oil from the buds was observed after 120 days of sowing, when only 23.0 mg oil/100 g of fresh material was obtained. During the period of 90 days to 105 days, a significant decrease in leaf oil content was observed, at the same time the plants were flowering. This data suggests the plants were relocating their resources to produce more oil in the floral buds.