Amazon SwordplantAmazon SwordplantEchinodorus amazonicusPhoto © Animal-World
Amazon Swords are actually amphibious bog plants, but most can become completely aquatic if submerged for long periods!
Amazon Swordplants can grow to a maximum of 14 to 20 inches (35 to 50 cm). The leaves, being very long and fairly broad, make up the main part of the Amazon Sword plant. Their height and shape makes them ideal for background or mid ground decorations.
The leaves of the Amazon Swords can, and often will, grow above the surface of the water if the conditions allow it to do so. This trait makes them very popular for aquariums with a low surface level. However if you do not want the plant growing above the water, trim its roots and long leaves periodically. Also remove older leaves to keep the plant looking healthy.
Amazon Swordplants are relatively easy to keep, with a few basics to keep in mind. They do well in fine, iron-rich substrates, bright lighting, and fairly soft water. Be careful of high carbonate hardness levels, because this can affect how well the plant grows.
For more Information on keeping a planted aquarium see:
About Planted Aquariums, Adding Aquatic Plants For a Healthy Aquarium