Pumpkin - a good luck symbol

Ева Туник
Why in China is pumpkin a symbol of good luck for good people?

Every peasant was obligated to carry the largest most beautiful pumpkin as a gift to the Emperor. 
 
One poor widower had three daughters to feed—he decided to hide his pumpkin to himself. His rich neighbor wanted to blackmail him and asked to marry his youngest.  The widower had no choice but to agree. 
 
Then the greedy neighbor came for the precious pumpkin, and the widower agreed once more.   
 
Third time the villain came to blackmail the widower into giving up his home, and garden—got refusal. 
 
The Blackmailer went to the Emperor and got beheaded for hiding the most beautiful pumpkin.