Boxes Event
The event menu presents a game field consisting of 48 cells with lockable holes. The field is divided into 4 equal parts: red, yellow, white, and blue. In the very center of the field are 4 main boxes, each of a different color.

When you receive seed packets (by purchasing 1 or 10 packets or by watching ads), you get a key corresponding to the color of the flower whose seeds you received. For example, getting 3 Snapdragon packets gives you 3 white keys, 2 Peruvian Lily packets gives you 2 yellow keys, and receiving 1 Ipomoea flower gives you 1 blue and 1 yellow key (similar mechanics apply to all multi-colored flowers).
After receiving the seeds, the event menu opens, and the keys automatically open random boxes of matching colors, i.e., blue keys open blue boxes, and so on. One key opens one box, but this does not apply to the main boxes (those in the middle)! To fully open them, you need 3 keys.
The more cells you open, the more seeds you get!

Rewards: Opening all boxes of a specific color gives you packets of seeds of flowers of that same color, which were hidden under the cells. Moreover, small rewards (including crystals and coupons) also fall out of the cells. From the main boxes in the middle of the field, 4 x3 packs for your most pumped flowers of the corresponding color fall out.