In the middle portion would typically be plants that are half submerged. In this case what I call the “Main Attraction” – Lotuses and Lilies will fit this category very well since they have roots that extend well below the water surface, penetrating deep into the soil to absorb any excess nitrates and waste generated by the fish. At the same time, the leaves and flowers will rise well above the water surface creating a beautiful scene.
Last but not least, some floaters at the very top surface could be added in as well. Plants such as water lettuce and duckweed go a long way in keeping the waters healthy and purified for the fishes living in it.
Although I have covered a large range of plants that are available to be utilized in the Pond in a Pot. Not all of them are necessary, you may pick and choose as you wish. Freedom of choice is important my friends.