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