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Knowledge of the engineering properties of seeds, grains, nuts, kernels, and fruits is vital in the design of planting, harvesting, and postharvesting machines. This study investigates moisture‐dependent geometrical, gravimetrical, frictional, rheological, and aerodynamical properties of arugula seed. The length, width, and thickness of the seed distributions were modeled by the Normal, Log‐normal, and Weibull probability density functions. In the moisture ranges of 4.68–20.50%, the major, intermediate, and minor seed dimensions increased from 2.01 to 2.35 mm, 1.60 to 1.98 mm, and 1.17 to 1.33 mm, respectively. The results indicated that Log‐normal distribution had the best performance in most cases. Values of 1,000‐seed mass, bulk density, particle density, and porosity ranged between 1.33 to 1.77 g, 703.07 to 644.37 kg m⁻³, 1,160 to 1,392 kg m⁻³, and 39.39 to 53.71% as in the above moisture …