Tomato Mirsini F1 is an early determinate hybrid intended for cultivation in open ground and plastic greenhouses. The plant features balanced growth and good foliage, which effectively protects fruits from sunburn. The hybrid is resistant to various diseases, including alternaria, verticillium and fusarium wilt, leaf spot, tobacco mosaic virus, yellow leaf curl virus, tomato leaf curl virus, and nematodes, ensuring a stable and high yield under various growing conditions. Tomato Mirsini F1 fruits have a flat-round shape and a rich red color. Fruit weight varies from 200 to 400 grams, and they are dense, meaty, and have a sweet-tart flavor. Due to their high density, the fruits have a long storage life and good transportability, making the hybrid attractive for both fresh consumption and processing. The hybrid also demonstrates high plasticity, successfully setting fruit under various climatic conditions, including humid and dry periods. Fruits are rich in vitamins C, P, PP, B1, B2, and carotene, and contain significant amounts of proteins, carbohydrates, and minerals such as potassium, sodium, calcium, phosphorus, and iron. The composition includes citric and malic acids, which give tomatoes their distinctive taste and beneficial properties. The recommended planting density is 22-25 thousand plants per hectare, with optimal development requiring plant training and support up to a height of about 130 cm.