Echinodorus cordifolius is a great aquarium plant that can handle many different conditions. This plant can thrive in low to high temperatures. The leaves of this plant have a long petiole and are spoon-shaped making a nice contrast for other swords. They are a large plant, making it perfect for the background of your aquarium. The highlight of Echinodorus cordifolius are the large bright green leaves it produces. Radican sword plants are great in aquariums for beginners.