Planted by streams of water means you have the spiritual nourishment that brings prosperity. If you walk with God prosperity is a given.

Psalm 1How blessed is the man who does not walk in the counsel of the wicked,
Nor stand in the path of sinners,
Nor sit in the seat of scoffers!
2 But his delight is in the law of the Lord,
And in His law he meditates day and night.
3 He will be like a tree firmly planted by streams of water,
Which yields its fruit in its season
And its leaf does not wither;
And in whatever he does, he prospers.

The tree in this picture is not real, but God’s promises are very real.