1. The only way to buy kohlrabi is to go to the uninhabited island to find Cao Xin every Sunday morning 12. He comes to sell kohlrabi every Sunday. You can buy kohlrabi from it as long as you find it.

2. After that, you can go to the beaver every day to ask about the price of kohlrabi. If you are satisfied with the price, you will sell it. If you are not satisfied, you will continue to hoard it for only one week. After a week, kohlrabi will rot whether it is sold or not.