The choices are to answer the question by repeating the fundamentals, vote to close the question as a duplicate or....
For first time users we want them to come back so closing the question would not be perceived as very friendly. Yet what I see as a virtue of Stack Overflow: having one really good answer to a question can be overwhelmed by having numerous answers to the same question.
Unlike our technically minded forums the pace of horticulture is much slower. The key to a good lawn today is the same as last year or ten years ago.
What is the best solution to providing a good answer without repeating yourself and respecting a new users question?