Koi and plants do fine if the plants are abundant enough. If you “try” one or two plants to see how it goes the group of Koi will consider them quite the novelty and will probably allocate a lot of time to checking them out. Not having thumbs, they experience their world with their mouths.
If there’s ANY gravel in the pond, they will spend time sifting that, and rolling the rocks around, and playing with the plants, and then the plants aren’t the sole entertainment.
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Dr Erik Johnson is a Marietta, Georgia Veterinarian with a practice in small animal medicine. He graduated from University of Georgia with his Doctorate in 1991. Dr Johnson is the author of several texts on Koi and Pond Fish Health and Disease as well as numerous articles on dog and cat health topics.