Coontail, Hornwort
Ceratophyllum demersum

Family: Ceratophyllaceae
Genus: Ceratophyllum (ser-at-oh-FILL-um) (Info)
Species: demersum (Dem-er-sum) (Info)

Category:

Ponds and Aquatics

Height:

6-12 in. (15-30 cm)

12-18 in. (30-45 cm)

18-24 in. (45-60 cm)

24-36 in. (60-90 cm)

36-48 in. (90-120 cm)

Spacing:

9-12 in. (22-30 cm)

12-15 in. (30-38 cm)

15-18 in. (38-45 cm)

18-24 in. (45-60 cm)

Hardiness:

USDA Zone 6a: to -23.3 C (-10 F)

USDA Zone 6b: to -20.5 C (-5 F)

USDA Zone 7a: to -17.7 C (0 F)

USDA Zone 7b: to -14.9 C (5 F)

USDA Zone 8a: to -12.2 C (10 F)

USDA Zone 8b: to -9.4 C (15 F)

USDA Zone 9a: to -6.6 C (20 F)

USDA Zone 9b: to -3.8 C (25 F)

Sun Exposure:

Full Sun

Danger:

Parts of plant are poisonous if ingested

Bloom Color:

Green

White/Near White

Bloom Time:

N/A

Foliage:

Leathery-Textured

Other details:

May be a noxious weed or invasive

Very high moisture needs; suitable for bogs and water gardens

Soil pH requirements:

6.1 to 6.5 (mildly acidic)

6.6 to 7.5 (neutral)

7.6 to 7.8 (mildly alkaline)

7.9 to 8.5 (alkaline)

Patent Information:

Non-patented

Propagation Methods:

By dividing rhizomes, tubers, corms or bulbs (including offsets)

From leaf cuttings

From seed; germinate in a damp paper towel

Seed Collecting:

Properly cleaned, seed can be successfully stored

Regional

This plant has been said to grow in the following regions:

Vincent, Alabama

Oak View, California

Chicago, Illinois

Cleveland, Ohio

Portland, Oregon

Gardeners' Notes:

4
positives
0
neutrals
0
negatives
RatingContent
Positive

On Dec 29, 2007, Opoetree from Oak View, CA wrote:

I collected this plant from Lake Casitas (was floating on top of the water) in Oak View, California. I added it to my aquarium and it has grown very well. I also have anacharis.

Positive

On Jun 10, 2006, JoieM from Portland, OR (Zone 8a) wrote:

I credit this plant with finally clearing the "muddy" water in my pond, but it spreads like crazy. I started with three small plants. Within about a month, I seem to have 4-5 very large ones.

Positive

On Jan 4, 2003, easter0794 from Seffner, FL wrote:

I confused this with parrot feather but it doesn't grow above pond water level. Just let it float. My gold fish breed in it. It provide great oxygen and algae control for the pond and aquarium.

Positive

On Nov 5, 2002, mystic from Ewing, KY (Zone 6a) wrote:

This is a submerged rootless water plant. Has delicate fern like foliage. Makes a good oxygenator for a home water garden. It does spread freely. If you want more just break off a piece and float it in the water it will soon start to grow.