The thing you put into the ground was just a seed (maybe a wheat seed, or whatever). You don’t put the body of the plant in the ground, but just the seed.
That’s a stupid question. You know, all sorts of things die and then they get new bodies. Think about seeds and plants. If you plant a seed in the ground, that seed dies. But that is not the end. A new plant grows up. That seed comes alive again and grows up into a new plant.