Sentence:  The first field it did was one on which Swedes had been roughly planted the year previously, but it had not been touched since the crop was eaten off, and was then a perfect wilderness of <WSD>Couch</WSD>, Docks, Thistles, and Dandelions. 
Meaning of the word marked with <WSD> tags:  (Couch grass), a species of persistent grass, "Elymus repens", usually considered a weed.