Common buckwheat (Fagopyrum esculentum Moench.) has a long history of cultivation in the large, mountainous regions of Bosnia and Herzegovina (B&H). Its commercial production is mainly based on the regionally bred variety ‘Darja’, but numerous landraces are also being grown on a smaller scale. As part of the SEEDNet (Southeast European Network on Plant Genetic Resources) project, these landraces have been collected and stored at the Gene bank of the Faculty of Agriculture and Food Sciences in Sarajevo (FAFS). To assess their utilization value, it was first important to investigate if they represent distinct landraces and to identify their genetic relationships with the most commonly grown varieties in the region (‘Darja’, ‘Goluba’ and ‘Čebelica’). Therefore, the aim of this study was to assess the genetic relationships and diversity of the common buckwheat accessions maintained at the FAFS Gene bank, as well as the value of these accessions for future breeding programs, using microsatellite markers and seventeen quantitative and fifteen qualitative morphological traits. The FCA (Factorial Correspondence Analysis) and AMOVA (Analysis of Molecular Variance) revealed that several accessions represent completely distinct landraces which clearly differentiated from the most commonly grown cultivars ‘Darja’ and ‘Goluba’. Conducted morphological analyses revealed that several of the analyzed landraces hold similar characteristics to the ones observed in ‘Darja’ and ‘Goluba’, while others possess unique traits potentially useful in breeding programs.

Lavandula species are one of the most popular aromatic plants in the world and have a high content of high-quality essential oil (EO). Although there are many species in this genus, only lavandin (Lavandula intermedia Emeric ex Loisel.) and lavender (L. angustifolia Mill.) are highly valued worldwide. The quality and yield of lavandin and lavender depend on genetic factors, environmental conditions and cultivation methods. Therefore, the aim of this paper is to research the effects of the application of biostimulant on the inflorescence yield and the quality of lavandin and lavender. The treatments used in this research consisted of a combination of different species (lavandin and lavender) and biostimulant (applied and unapplied). The research results show that all the research traits significantly depended on the used species and the applied biostimulant. The inflorescence yield, the content of total flavonoids, and the content of EO were higher in the lavandin species (477.3 g plant^-1, 17.21 mg CAE g^-1, 8.57 mL 100 g^-1, respectively) than in the lavender species (180.5 g plant^-1, 13.41 mg CAE g^-1, and 3.69 mL 100 g^-1, respectively). EOs of lavandin and lavender were rich in linalool and linalyl acetate. The use of biostimulators had a positive effect on the inflorescence yield and the content of essential oil. Furthermore, the applied biostimulant increased the linalool content in the essential oil of both researched species, i.e. it positively affected its quality.