Hornwort, Ceratophyllum demersum, is one of the most popular aquarium plants in the trade.  Hornwort, or Coontail as it is more commonly referred to is able to tolerate a wide range of aquatic conditions which is the reason for its popularity.  Ceratophyllum demersum is also very common is the water garden industry where it is used as an oxygenating plant for small water features and ponds.  Hornwort adapts easily to floating or to being planted.  Ceratophyllum demersum is native to the United States and makes an excellent habitat for fish to lay eggs on or hide in.   

Common Name: Hornwort, Coontail
Family Name: Ceratophyllaceae
Native To: North America
Lighting: Moderate to Strong
pH: 6-8
Growth Demands: Easy
Growth Form: Stem Plant
Growth Rate: Fast
Placement in Tank: Mid - Background
Available As: Bunch
USDA Hardiness Zones: 5-11