Freshwater aquarium plants are one of the most popular components in freshwater aquariums. The aquarium plant trade is a lucrative trade in its producer countries. In fact, the aquarium is a closed and controlled environment that coordination between all its components is necessary to maintain the balance and stability of this small ecosystem. They beautify the interior of the aquarium, moreover create an ecological balance for the fish in the aquarium. The main advantages of using aquatic plants in the aquarium are regulating the hardness of water, increasing water-soluble oxygen, and maintaining the proper pH for fish health. Aquarium plants provide a very safe environment for ornamental fish and enable them to hide around leaves and stems. This article gives an overview of some of the main aquarium plants in Iran and the world and presents the biological needs for some of these plants.