The pink flower is a wild scattering symbol. This means it will be used to replace all other symbols, and if you get 3 or more anywhere on the screen, you can pay, no matter what the payline is.
If you get three wild/scatter symbols anywhere on the 5 reels, you will also trigger 10 free rounds. Any symbol here (except for pink flowers) will be selected as an additional "extended" scattering. Using the lower symbols (10, J, Q, K, A), you can display three symbols on the screen during the free spin to fill the entire column and win.