I'm looking at researching bamboo as a possible renewable resource because of its ability to grow and spread so fast. I was wondering what would be the best bamboo that could produce the most biomass in 3-5 years. I'm from Iowa so it would have to be cold hardy from -10 to -15 degrees F. I'd like a large bamboo that would grow rather fast in the first 2-3 years, if possible. I'd appreciate any and all help becasue I really don't know anything about bamboo and its differnet species. Thanks again!