There is the suggestion that because of the twisted and interlocking nature of its grain structure elm trees can. Top 5 worst wood to split [hardest woods by hand] 1. Browse mini skid steer attachments.
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Hardest Wood to Split Page 6 Firewood forum Arbtalk The Social
Another top ranker on the difficult to split list is sweetgum.
During the drying process, the wood warps.