Improvement of the urban microclimate with aromatic and medicinal plants

Abstract

The paper examines the bioclimatic contribution of urban gardening through the use of aromatic and medicinal plants, proposing an innovative approach to urban design. The research aims to evaluate the role of these plants in improving the urban microclimate, focusing on their ability to reduce temperature, increase relative humidity, and contribute to the creation of a synergistic ecosystem that attracts beneficial insects. The methodology involved experimental research at eight sites in Thessaloniki, where temperature, humidity, and solar radiation were recorded. At the sites with aromatic and medicinal plants, a temperature reduction of 10-15% was observed compared to the non-planted areas. Significant improvement was recorded in areas simulating balconies, where potted plants led to a temperature reduction of 5-10%. Furthermore, areas with dense vegetation and water features showed greater humidity, while air circulation was limited, creating adverse thermal comfort conditions. In locations with small arrangements of aromatic plants, a reduction in discomfort perception of up to 26% was observed. The study highlights the innovative potential of integrating aromatic and medicinal plants into urban design for improving the microclimate. Replacing grass in public spaces and using these plants on vertical and horizontal surfaces can improve thermal comfort, aesthetic value, and attract beneficial insects, such as bees.