Match Cropsies next to a flower to make it grow and bloom. Each time you do so, the flower will grow another stage until it's fully bloomed and removed from the board.
In some levels your task will also be to plant the flower, by matching a flower seed with a water droplet. Be sure to check the total number you need to collect for the level and how many you already have on the board. If you need more, you'll need to plant the seeds and show some love to the pending bloomer!
The shovel booster can also be used to grow a flower a stage.