There is increasing interest in the use of vegetable-fiber-reinforced structural concrete elements in developing countries. Vegetable fibers facilitate the production of structural elements that are cheaper, lighter, improve mechanical properties of the cement, and provide auraland thermal insulation. Vegetable fibers are preferred because they increase the ductility of the material; this has the important effect of improving energy absorption capacity when cracks occur. In addition, the manufacturing cost of this material is very low. Aggregate obtained from Gamber village (Kayseri) was used to produce reinforced concrete beams that included ground Miscanthus giganteus material (8 samples, 4 mixtures, dimensions 30 x 30 x 200 cm). Aggregate granulometry was held fixed,and beams of 400 kg/m3 were producedwith different fiber contents (0%, 2%, 4%, 6%). These beams were exposed to bending testsafter a curing period of 28 days. The effect of Miscanthus on the ductility and energy absorption capacity of the beams was compared.