This is a double definition - the clue gives you two different meanings or descriptions of the same answer word, separated by a linking word or phrase.
Look for a word that means both 'Scots knew' (past tense of knowing in Scottish dialect) and relates to 'England's garden'. The question mark suggests one definition might be playful or metaphorical.
Answer: KENT | Double definition: 'kent' is the Scots past tense of 'know', and Kent is famously known as 'the garden of England' due to its agricultural abundance.