The earth causes plants to grow.\par People plant seeds in the garden,\par and the garden makes them grow.\par In the same way, the Lord\par will make goodness grow.\par The Lord will make praise grow\par in all the nations.”\par
And when you plant something, the thing you plant does not have the same “body” that it will have later. The thing you plant is only a seed, maybe wheat or something else.
All things made of flesh (bodies) are not the same kind of flesh: People have one kind of flesh (body), animals have another kind, birds have another kind, and fish have another kind.
So the person that plants is not important, and the person that waters is not important. Only God is important, because he is the One who makes things grow.