Here **you** is a metonym that refers to his servants. The landowner probably had his servants plant the seeds. Alternate translation: “we planted good seed” (See: [[rc://en/ta/man/translate/figs-metonymy]])
This is a quotation within a quotation. The entire quotation can be restated so that this portion is an indirect quotation: “The man answered that only his enemies would want to plant them, so it was one of his enemies who did this.” (See: [[rc://en/ta/man/translate/figs-quotesinquotes]])