Sentence:  Like "Janus" he the stubborn Soil manur'd, / With Rules of Husbandry the <WSD>Rankness</WSD> cur'd: / Tam'd us to Manners, when the Stage was rude; / And boistrous "English" Wit, with Art indu'd. 
Meaning of the word marked with <WSD> tags:  Exuberant or uncontrolled growth.