Joan comes every Sunday from 6:00 AM to 12:00 PM. She gives you turnips for a price, there are white turnips and a red turnip available. She decides on a price and you pay her; you can get as many white turnips as you can with your bells, but be careful how you spend it. White turnips are useful for selling to Tom Nook, check every day what Tom Nook buys turnips for, and if it is a high price, sell all of the white turnips you saved up. You can only receive one red turnip from Joan, but it's worth it. Plant it in the ground and make sure to water it every day. When it is ready, dig it up and you can give it to Wendell the next time you see him. Make sure your turnips don't spoil.