Klamath weed

noun

1. the St.-John's-wort, Hypericum perforatum.

Word History and Origins

Origin of Klamath weed¹

1920–25, named after the Klamath River

Example Sentences

In Europe the Klamath weed, or St. Johnswort, has never become a problem because along with the plant there have developed various species of insects; these feed on it so extensively that its abundance is severely limited.

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A ten-year survey completed in 1959 showed that control of the Klamath weed had been “more effective than hoped for even by enthusiasts,” with the weed reduced to a mere 1 per cent of its former abundance.

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Land values declined accordingly, for the Klamath weed was considered to hold the first mortgage.

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Klamath weed, quite unlike such native plants as sagebrush, has no place in the ecology of the region, and no animals or other plants require its presence.

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Within small areas the beetles accomplish their own dispersion, moving on as soon as the Klamath weed dies out and locating new stands with great precision.

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