The explanation for It is because Elm has a attribute that no other variety of firewood has: the annual rings are wavy. For most different types of wood, the traces in the annual rings are comparatively uniform. But for Elm, the rings are wavy and Pretty much seem “blurry” so https://firewood18090.blogprodesign.com/50267213/indicators-on-firewood-for-sale-you-should-know