The stratosphere is a layer of the Earth’s atmosphere, located above the anthroposphere and below the mesosphere. The stratosphere has particular meteorological conditions, such as high UV-A radiation, slow atmospheric pressure, and temperature variations. Currently, several studies have shown that organisms suchas plants can be positively affected by exposure to stratospheric conditions, especially UV-A radiation. However, studies on the viability of seeds have been little developed. For this reason, this study aimed to evaluate the viability of Solanum lycopersicum Lam, 1794 “Tomato Prince Borghese” and Beta vulgaris Linneo, 1753 “Beet” seeds under stratospheric conditions. Th e seeds were taken to the stratosphere by the stratospheric balloon of the “Asociación Peruana de Astrobiología”, which is also equipped with meteorological instruments to measure the altitude, te...