Douglas firs grow between one and two feet a year and have for as long as people have been writing it down (in English, anyway). We've definitely gotten better

Douglas firs grow between one and two feet a year and have for as long as people have been writing it down (in English, anyway). We've definitely gotten better at breeding fast softwoods, but we've done so through smarter silvaculture--tree positioning matters a lot, turns out--and selective breeding.