User: Is switchgrass a good biofuel source?
Assistant: Switchgrass is an excellent biofuel source for many reasons.  Switchgrass grows natively throughout the United States, Mexico, and Canada.  It has a dramatically higher energy yield than corn.  It requires almost no pesticides to grow and no fertilizer.  Switchgrass actually pulls carbon out of the air and puts it into the ground through it's large root system, thus enriching the soil it grows in rather than depleting it.  Once a switchgrass plant is established it grows back naturally every year for 18 to 20 years.