The trees of the Lord are full of sap; rather, are satisfied, or have their fill; i.e. drink in sufficiently God's rain, so that they grow up and flourish amazingly. Even the cedars of Lebanon (see Psalms 29:5, Psalms 29:6; Psalms 92:11).
These are particularized as the grandest of God's vegetable productions known to the psalmist (comp. 9:15; 1 Kings 4:33; 2 Kings 14:19; Isaiah 2:13; Ezekiel 31:3). Which he hath planted (comp. Numbers 24:6).