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Plant response is not only dependent on the atmospheric evaporative demanddue to the combined effects of wind speed, air temperature, humidity, and solarradiation, but is also dependent on the water transport within theleaf-xylem-root system. Therefore, a detailed understanding of such dynamics iskey to the development of appropriate mitigation strategies and numericalmodels. In this study, we unveil the diurnal dynamics of the microclimate of aBuxus sempervirens plant using multiple high-resolution non-intrusive imagingtechniques. The wake flow field is measured using stereoscopic particle imagevelocimetry, the spatiotemporal leaf temperature history is obtained usinginfrared thermography, and additionally, the plant porosity is obtained usingX-ray tomography. We find that the wake velocity statistics is not directlylinked with the distribution of the porosity but depends mainly on the geometryof the plant foliage which generates the shear flow. The interaction betweenthe shear regions and the upstream boundary layer profile is seen to have adominant effect on the wake turbulent kinetic energy distribution. Furthermore,the leaf area density distribution has a direct impact on the short-waveradiative heat flux absorption inside the foliage where 50% of the radiation isabsorbed in the top 20% of the foliage. This localized radiation absorptionresults in a high local leaf and air temperature. Furthermore, a comparison ofthe diurnal variation of leaf temperature and the net plant transpiration rateenabled us to quantify the diurnal hysteresis resulting from the stomatalresponse lag. The day of this plant is seen to comprise of four stages ofclimatic conditions: no-cooling, high-cooling, equilibrium, anddecaying-cooling stages.

Unveiling dynamic changes in the diurnal microclimate of a Buxus  sempervirens with non-intrusive imaging of flow field, leaf temperature, and  plant microstructure