Charles Ellicott Commentary Psalms 80:15

"And the stock which thy right hand planted, And the branch that thou madest strong for thyself." — Psalms 80:15 (ASV)

And the vineyard which ... —Most modern scholars follow the Septuagint and Vulgate in making the word rendered vineyard an imperative of a verb, meaning protect: And protect what your right hand has planted. This makes a good parallelism.