Coontail, Hornwort

Ceratophyllumdemersum

Genus
Ceratophyllum (ser-at-oh-FILL-um)
Species
demersum (Dem-er-sum)
Synonym
Sun Exposure
Full Sun
Foliage
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)
Danger
Parts of plant are poisonous if ingested
Bloom Color
Chartreuse (yellow-green)
White/Near White
Bloom Time
N/A
Other Details
Category
Ponds and Aquatics
Water Requirements
Very high moisture needs; suitable for bogs and water gardens
Foliage Color
Where to Grow
Bloom Characteristics
Bloom Size
Other details
May be a noxious weed or invasive
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 is said to grow outdoors in the following regions:

Vincent, Alabama

Glendale, California

Oak View, California

Chicago, Illinois

Cleveland, Ohio

Portland, Oregon(7 reports)

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Gardener's Notes:

4
positives
0
neutral
0
negative
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O
Oak View, CA | December 2007 | positive

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 ha...Read More

J
J
Portland, OR (Zone 8a) | June 2006 | positive

I credit this plant with finally clearing the "muddy" water in my pond, but it spreads like crazy. I started with three small plants. Wit...Read More

E
Seffner, FL | January 2003 | positive

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 provid...Read More

M
M
Ewing, KY (Zone 6a) | November 2002 | positive

This is a submerged rootless water plant. Has delicate fern like foliage. Makes a good oxygenator for a home water garden. It does spread...Read More

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