Medicinal and aromatic plants hold a high share of interest in Romania. To offset the harvesting of spontaneous flora and ensure the sustainable conservation of natural resources, the cropping of highly valuable plants of interest represents a priority for the current agricultural system. This study was conducted due to the need for more balance in species exploitation. Therefore, it assessed the emergence dynamics, leaf appearance, growth and development of the plants depending on row spacing and plant distance. The research was conducted at the INCDCSZ Brașov, within the Technology Department, Laboratory of Medicinal and Aromatic Plants. The density of planting is the most important factor. Plants sown in continuous rows showed the highest yields of fresh and dry herbs, especially when the distance between the rows was set to 25 cm. Row-by-row distances of 50 cm ensure average values for all growth and development parameters. An increase in the row-by-row distance up to 70 cm drastically reduced the dry biomass up to 7.89 t ha⁻¹ in continuous rows, followed by a 2 and 2.5 t ha⁻¹ decrease for 15 cm and 25 cm plant-by-plant distances, respectively. Continuous row planting and a 25 cm row-by-row distance negligibly reduce the climate impact on growth and development. Greater spaces between plants leads to an average increase in individual development, but with a decrease in the total potential yield.

Lavender (Lavandula angustifolia L.) is one of the species cultivated in many countries of the world, being used as a medicinal, industrial and ornamental plant. It is distinguished as one of the most valuable plant species with a high content of essential oils. It is known that Lavender has a low seed germination rate, requiring vegetative propagation techniques, appropriate for obtaining high-quality planting material, which ensures both uniformity and high productivity. This work aimed to identify the most efficient method of lavender propagation by cuttings, to be economically profitable, and thus to support farmers who want to establish a Lavender crop but have limited financial resources. To determine the effect of cutting length on the rooting process, a factorial experiment was carried out, consisting of five variations of cutting length and a control variant of seed propagation. Each experimental variant had five repetitions, the tested lengths were: 3 cm, 5 cm, 8 cm, 10 cm and 15 cm, rooting and emergence evaluations were made 30 days after planting. The results obtained showed that the best rooting variant of lavender cuttings is 5 cm with a percentage of 87% rooted cuttings 45 days after planting.

These researches were carried out in order to introduce the species Primula officinalis into the culture and to establish an ecological cultivation technology. The species Primula officinalis Hill., synonymous with Primula veris L., popularly known as cowslip, common cowslip or cowslip primrose, is a perennial, herbaceous species, being one of the 400 species of the Primula genus. In some countries from Europe, this species is on the verge of extinction, due to intensive harvesting from the spontaneous flora, grazing, deforestation and alpine herbicides. In Romania, Primula grows spontaneously, starting from the lowlands, on hills, pastures, alpine meadows, up to approximately 2300 - 2400 m altitude. It is known in folk medicine as having multiple phytotherapeutic uses. Primula has been used since the Middle Ages for the treatment of gout, headaches, migraines. The saponins found in the rhizomes and flowers are used in the phytotherapeutic treatment of bronchitis and colds due to their expectorant effects. The paper presents results regarding the influence of the nutrition space on some elements of growth and development in the species Primula officinalis, with a determining role in the amount of vegetable mass obtained.