THE KING AND THE SEED

The emperor is looking for a husband for his daughter. He summons the
bachelors of the kingdom for a contest about cultivating the most
beautiful plant of the seed that the king gives to them. Six months
later, the candidates bring to the palace all sort of beautiful plants.
The seed of a young man did not germinate, yet he went to the palace with an empty pot. Everybody laughs at him.
And yet, he is chosen by the emperor to marry the princess.
Why?