This is a full-time PhD position (36-month contract) funded under the Marie Skłodowska-Curie COFUND PhD@Tec21 programme. The research focuses on the hydromechanical interactions between growing plant roots and soil, aiming to develop a comprehensive multiscale and multiphysics modelling framework. It bridges root biophysics, soil mechanics, and water transport phenomena by integrating experimental data (e.g., 4D X-ray and neutron tomography) with advanced numerical simulations. The work has applications in sustainable agriculture, civil engineering (soil stabilization), and bio-inspired robotics. The PhD project will be conducted jointly at two leading laboratories on the Grenoble campus: the 3SR Laboratory (geomechanics, porous media, imaging) and the LIPhy Laboratory (biophysics of living systems). A variety of modelling techniques (e.g., continuum mechanics, FEM, DEM) will be used to link microscopic and macroscopic behaviours in soil-root systems, with candidates selecting a specialised research axis based on interest and background.