After eventually figuring out how much Duke the Gay Workman wanted for his spade, I could start digging stuff up. Stuff like sweet potatoes and rupees! Well, OK – only sweet potatoes and rupees. Although I did dig some holes I could fall through and found some treasure chests with more rupees in.
Then the tower shrunk! I didn’t know it did that! It seems if you don’t keep chucking rupees in, it shrinks again, undoing all your rupee-earning. Rubbish!
Thankfully, I made a pile of rupees from the jeweller for saving his daughter from the Oinkers in Lon Lon Meadow, so I could grow it again, and then grow it some more. Phew! I’ve unlocked Deku Forest now too.