People often think about the movie Hunger Games when they hear the word ‘katniss' because of its protagonist's name is Katniss Everdeen, but the truth is katniss is a beautiful aquatic plant that has 3-petal flowers. They're a bit invasive but they're easy to control and since it's an aquatic plant, it's best that you plant them in a water garden where its roots can stand.

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Source: Gardening Know How