After you have placed the bet, you'll state your position, either hot or cold. The host will plant a flower with Mithril seeds and by using the table at the bottom of this page you will be able to identify if you won or lost.
The first thing you would need to do is to find a trusted host who offers to play flower poker, this would ensure your safety of the item(s)/money you are betting.
Make sure that the both of you have agreed to the game you are wishing to play. For example, the host may think you are wanting you play Flower Poker when you are wanting to play Hot & Cold.
When everything is confirmed and accepted (items given to host or mm), the game will then begin. The host will then have to plant 1 Mithril seed.
After you and the host have planted, the winner is evaluated by the colour of the flower. Black and white are considered automatic replants, Rainbow is an automatic host win. Red, Orange, Yellow are wins if you have chosen Hot Purple, Pastel and Blue are wins if you chose Cold.