Sweet potato farm shop

My wife and daughters wanted to go to a farm shop near my city and dig sweet potatoes. The farmers said that you could dig three vines for JPY 600 (one person), and they did their best to shovel all the potatoes from the earth. I was a little sleepy and stayed in the car with my dog, and was watching them enjoy the farm work. They harvested many potatoes, and we enjoyed them for dinner.