Mellisa officinalis L. is a herbaceous, perennial plant, known as lemon balm. Our previously published scientific studies on lemon balm included biotechnological, biometrical and biochemical research results. As the inner structure of lemon balm is not entirely known, the purpose of this scientific study was to observe each and every aspect in this species’ development, as well as its organs’ histo-anatomy. The vegetal material used in the histo – anatomical research was represented by axial and lateral vegetative organs of lemon balm plants originating from Greece, acclimatised and cultivated in Racova village, Bacău county. The tested plants were in various developmental stages.
