Joan (カブリバ,,Kaburiba?) is a special visitor who comes to the player'stown each Sunday morning (6 AM to 12 PM) to sell turnips. She is a brown boar with large white tusks carrying a basket on her back with white turnips inside. She has orangish,brownish cheeks. She wears ragged blue clothes and a small, blue bandanna on her head. Originally she only sells one type of turnip in Animal Crossing, and sells two types in Wild World and City Folk. In New Leaf, however, she goes back to only selling White Turnips.
Joan's background is unknown, but she has told the player she had been selling turnips for sixty years. She appears in town on Sundays before noon in every game so far. In Animal Crossing and New Leaf, she sells White Turnips. White Turnips, however, sell for a different price depending on Stalk Market. The Stalk Market is a play on the existent Stock Market in reality. More than one can be bought a week from Joan. Players can ask Tom Nook (Reese in New Leaf) what White Turnips are currently selling for at two different times of the day, which will have different prices and he will buy White Turnips between Monday and Saturday.
In Wild World and City Folk, she continues to sell White Turnips which work the same way as they did in the original games on every Sunday. She now also sells Red Turnip Seeds for 1,000 Bells which will need to be planted like flowers, and be watered each day so they can grow to their full potential and later sold to Tom Nook for profit. Forget to water them one day and it wilts. This cannot be fixed. Red turnips require constant care. However, the player needs to be early to catch Joan and get a red turnip. Sometimes there are none. Only one Red Turnip can be sold to the player(s) each week.
Joan can be asked to explain her store and turnips, but she wishes not to explain how her store works. However, she does not act gloomy while explaining. Some villagers also explain that the player can buy them in bulk and go to Tom Nook's to sell them for a profit on a certain day. The player must not go too far ahead, though. After a week the turnips will expire become spoiled turnips, and are therefore useless.
As sure as the sun shines, you can count on Joan showing up every Sunday to peddle her turnips. While savvy investors can make a mint playing the turnip market, casual buyers may end up with a rotten-turnip ant farm.
In New Leaf, she refers to herself as 'sow Joan.' This is likely a reference to the Dow Jones stock market index since her turnips are resold as part of the "stalk market." If so, it could explain the origin of her name.
'sow Joan' could also mean that Joan is a female pig.
Joan always tells the player no matter how many years they have been playing, that she has been selling turnips for over 60 years, she still mentions this in City Folk, even if the player has been playing for ten years, or have time traveled. This may be because she says over sixty years, which covers any number of years beyond sixty.