Secrets With Lorn I

Lorn wants to have a secret way of sharing information and items with you. He set up a mailbox at the Post Office. It requires a password. You can access the mailbox if you can discover the password from this clue.

The watermelon has a relative that you can grow at level 40.

After you solve the clue and enter the password, bring Lorn the contents of the mailbox for a reward. He’ll also let you keep what was in the mailbox after you show him you were successful.