I always say there's no wood that won't burn. Ofcourse I'm talking about clean wood from the woods out back. My wood is about 3 or more years seasoned, So I burn the oldest end of the pile. This year, that section of the pile had a huge amount 2" - 6" unsplit rounds. About 50%. I forgot how much less work goes into this size wood is. Easy to cut, move. and no splitting. I top cover so I drys out fine unsplit.