In this minigame you press the O button in a single repeating beat. You can look at the white box border to pace your beat. The game starts when you hear the "HUI!" sound in the background, but I recommend you already start pressing O in a beat. Afterwards, the plant will pop out 3 items in a certain beat. Press the O button in the same way just before the falling sound stops.
Rewards include level 1 - 4 vegetables, which can replace meat in unit creation and costs less Kaching. Also, eyeball cabbage is used in another minigame.
How To Get: After mission 8 (Desert Crossing) the stage will change to a hunting mission (Creatures of the Sand.) Raining on this map will make Gancheek (snail) appear. Kill it and you will get your cap for your minigame.
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In conclusion, to catch the vegetables you have to wait for the falling sound to stop and then catch in a rhythm.