The article provides scientific data on the study of optimal norms and timing of leaf feeding in the care of young lemon seedlings in the open field. The care of young lemon seedlings in the open field focuses on the rapid growth of branches, enlargement of leaf surface and leaf activity. Due to the additional nutrition of the leaves, the growth and development of young lemon seedlings is accelerated, the leaf surface is cleaned of dust, which has a positive effect on the metabolism of the leaves, the process of respiration and photosynthesis in the leaves. As a result, young lemon seedlings grow well in the short term and are formed as seedlings ready for planting in the main area.