Sentence:  He had been visiting a friend in a neighbouring county, and that friend having recently had his grounds laid out by an <WSD>improver</WSD>, Mr. Rushworth was returned with his head full of the subject, and very eager to be improving his own place in the same way; ... 
Meaning of the word marked with <WSD> tags:  "Specifically", a person who improves land or property, a landscaper.