Tree Planting

If you plant a tree it will not shade you,
For people always plant saplings.
They dream of the tree's shade, or fruit,
Or that the tree will make a hedge.
But trees out live them, out last them.
The trees they plant are the next's.
The new them's shade, the new them's fruit,
A hedge to make the new them's yard private.
So does that make planting trees not worth it?
No, because the new thems will need it!