Elm wood is sturdy and durable; it's often used to make furniture.
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榆木 is famous in the idiom 榆木疙瘩 - literally 'a knotty lump of elm wood', figuratively 'a blockhead' / someone with a thick, stubborn mind. Elm is hard and resistant to splitting, so a knot of elm became the Chinese stand-in for a stubborn skull.
