The time required to harvest plant crops is important to the plant properties. It is affected by design of the harvest equipment and the desire for high-quality products with low energy consume. In this study, we determined the cutting properties of sage (Salvia officinalis L.) at different harvesting time to be applied to the design of mechanization applications. Cutting properties of sage (Salvia officinalis L.) (an important medicinal aromatic plant) harvested on 15, 22, 30 July and 7 August, 2013 (H1, H2, H3 and H4, respectively) were measured at the bottom and top sections of the stalk. Measurements included maximum force, bioyield force, shearing force, bending stress, shearing stress, shearing energy, and shearing deformation.