The key reason why for It's because Elm features a characteristic that no other variety of firewood has: the once-a-year rings are wavy. For some different types of wood, the lines from the annual rings are reasonably uniform. But for Elm, the rings are wavy and Nearly glance “blurry” so https://firewood58521.techionblog.com/28337494/firewood-cape-town-no-further-a-mystery