“The tree is named after Prussia. The wood came from there, and 'spruce' once meant 'Prussian' — which is also why 'to spruce up' means to look smart, because Prussian leather and fashions were considered the height of style.”
Middle English Pruce was the English name for Prussia — the Baltic territory that exported timber, leather, and beer to England in the 14th and 15th centuries. 'Pruce fir' or 'Spruce fir' meant 'Prussian fir.' The tree was named after its shipping origin, not its biology. Over time, the place name dropped away and 'spruce' became the tree.
The adjective 'spruce' — meaning neat, smart, well-dressed — came from the same source. 'Spruce leather' was fine Prussian leather. 'Spruce beer' was Prussian beer (made, coincidentally, from spruce tips). To be 'spruce' was to have Prussian taste. The verb 'to spruce up' appeared by the 1590s. Prussia's reputation for quality goods became an English compliment.
Spruces (genus Picea) are not actually native to Prussia in great numbers. The trees associated with 'Pruce fir' were probably Norway spruces (Picea abies), shipped through Prussian ports like Danzig (Gdansk). The naming honored the middleman, not the forest. English commerce cared about where goods were bought, not where they grew.
Spruce wood is the tonewood of choice for stringed instruments. Stradivarius used Alpine spruce for the tops of his violins in the early 1700s. The wood is light, stiff, and resonant — it transmits sound waves more efficiently than almost any other material. A Stradivarius violin is, among other things, a precisely shaped piece of what the English once called Prussian fir.
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Today
Nobody thinks of Prussia when they say 'spruce up.' The geographic origin has been completely absorbed into the word. A tree named after a country that no longer exists provides the wood that makes the best violins on earth sound the way they do. Stradivarius did not call it spruce. He called it abete — Italian for fir. The name did not matter. The resonance did.
Prussia dissolved in 1947. The tree kept its borrowed name. 'To spruce up' still means to look sharp. The country is gone but its reputation for quality persists in an English verb that nobody remembers to credit.
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