Pollen-related respiratory allergy has a significant impact on global public health, as it involves around one-quarter of the general population. On the other hand, green areas are of pivotal importance in improving the quality of life through a multitude of effects. Therefore, adequately selecting plants for the urban and country landscape represents an important preventive measure to reduce the burden of the disease. This review aims to summarize the characteristics of the allergenic plants and the measures that can be taken to reduce their impact on public health. The degree of allergenicity of plants can be predicted according to various tools, e.g. the Ogren Plant Allergy Scale (OPALS) and the criteria by the American Academy of Allergy, Asthma & Immunology. In brief, noninvasive, non-toxic, entomophilous plants (i.e. insect-pollinated flowers) should be the preferred ones. Interventions aimed at reducing the impact of pollen allergy should include both a correct selection of plants and simple individual preventive measures. In conclusion, better understanding how pollen-related respiratory allergy impacts on global public health and defining criteria to adequately choose plants for the landscape is of paramount importance to improve quality of life for children and adults with respiratory allergies.