I have been burning mostly ash,maple, and a little oak. I have some elm that has not been seasoned enough I suspect, because it will burn but soon smolders after having a flame on it. What are the characteristics of burning elm and how does it compare to other hardwoods? Don't know what type of elm but it is very stringy and has red coloring running through the center of the splits. Oh yeah, not very straight and considerable knotting. What does everyone think???