Here's the short of it: It's about beans. Trading them. Planting them. Selling them and making gold. And, dispite this silly theme - it's fun as hell to play.
I have to be honest, in todays market of slick, glossy game boxes where all that glitters is gold - the Bohnanza box had me a skeptical as soon as it was brought out I was like "Wait... there's a goofy 70's style illustration of a pissed-off bean on the box cover. What the hell is this?"
Needless to say, 45 minutes later I was not disappointed.
Simple, right? Well - sort of, until the strategy of the game hits you.
The fun with Bohnanza comes from a nuanced core mechanic: the value of each bean type is tied to the probability of finding that card in the common deck, yet each plot can only have one type of bean planted on it at any given time. It quickly creates a connundrum where players are trying to maximize the number of beans planted in their plots, while trading away cards they aren't have no need for from their hand.
I know... it sounds silly.And it is - but its fun as hell.
At it's heart - Bohnanza is a game of economics and trading, of making deals and breaking them. The average game lasts about thirty minutes to an hour and can handle up to six players. Add some great food, heady drinks, and great company to the mix - and it makes for a friggen great evening.
Have you played Bohnanza? What's your take on this game?
 Each player starts out with two bean plots (fields for farming beans of the same type), but you can purchase an additional plot as the game progresses; but this is a trade off since the "winner" is decided by who has the most gold at the end of the game.
 Trading can pretty much happen at anytime, and there's no rules as to what's allowed save for that you can only trade with the player whose turn it is. Hence, you can basically give away cards from your hand that have no value to you before your turn comes up.