Given the need to transfer grasses of the mexican semiarid of hight forage potential were evaluated switchgrass (Panicum virgatum), estearn gamagrass (Tripsacum dactyloides) and alkali sacaton (Sporobolus airoides) in production of forage, tiller population density, seed production as well as physical and physiological characterization of seeds. The study was carried out in two cycles from april to august and from august to december under irrigation conditions at 8 333 plants ha(-1). The treatments were three grasses, on field, Completely Random Blocks and in laboratory, Completely Random (Tukey alpha = 0.05). The highest forage yield was observed in switchgrass (3.59 t DM ha(-1), P < 0.0001), and surpassed eastern gamagrass and alkali sacaton in 3.0 and 4.9 times, respectively. The highest population density of tillers was seed eastern gamagrass with 216 tillers plant(-1) and surpassed switchgrass and alkali sacaton by 1.15 and 2.6 times, respectively (P < 0.0001). The highest production of dispersal units occurred in eastern gamagrass 177 kg ha(-1); similar to switchgrass with 147 kg ha(-1) (P > 0.05), however, cupules with incipient physical purity (0.79%). Viability decreased with a larger caryopsis size, therefore, a greater quantity of viable pure seed was determined in alkali sacaton (12.3 kg ha(-1)) and surpassed switchgrass by 1.3 times. Switchgrass is a forage alternative as it has good forage and seed yield in the first year of establishment. Eastern gamagrass is forage viable alternative to be propagated by plant material alive.