Basically the idea is that you defeat barbarians, collect resources on the map and in your City in you have a chance to receive boxes of carnations. You then collect these via the in-game mail system. Then you'll get eh boxes of carnations in the Other tab of your Items section. Use these to generation carnations which you can redeem for rewards in the Show Your Love event.
Flower Seeker
We have questions and answers related to this topic which may also help you: Show all