Foliar fertilisation is increasingly used in Polish agriculture to address specific micronutrient deficiencies, particularly when soil availability or root uptake is limited. However, its application should be guided by validated foliar analysis to accurately diagnose the type of deficiency and select the most appropriate foliar fertiliser. It is important to note that the majority of nutrient uptake occurs through the root system. Foliar absorption accounts for only a small proportion of total nutrient intake and should be reserved for exceptional cases of deficiency that arise during the growing season. Foliar fertilisation should not replace a well-planned, multi-year fertilisation strategy based on soil and crop requirements. These products are also being investigated for their potential role in crop biofortification, aiming to enhance the nutritional quality of agricultural produce. While foliar application allows for targeted nutrient delivery at critical growth stages, its effectiveness depends on agronomic context and should be integrated into a broader nutrient management plan.