Printer Friendly Version Print Plant Details

Ceratophyllum demersum

Also called Hornwort


More About Ceratophyllum demersum

  • Submerged aquatic perennial producing slender, often rootless stems
  • Forked, brittle, dark green leaves are often borne more densely near the growing points
  • Tiny cupped white male flowers
  • Green female flowers
  • Evergreen perennial that sinks through the winter to provide cover for fish and other aquatic wildlife
  • Great oxygenator for controlling algae in ponds
  • Bloom Time: Summer to early fall
  • Flower Size: 3 mm (male), 1 mm (female)

Interesting Notes:

Native to Ontario and most of North America.

Called "coontail" because of its tight whorls resemble a racoon's tail. 

Zone:

3

Height:

30-60 cm

Spread:

2-4 m

Colour:

Non-flowering
×

Coontail Growing and Maintenance Tips

Plant in full sun and relatively clear water with adequate levels of nutrients.  More tolerant of shade than the species. Will adapt to sites with slow-moving or stagnant water where there is some protection from wind and waves. It can be aggressive. 


Ceratophyllum demersum Characteristics

Full Sun
Full Sun
Partial Sun/Shade
Partial Sun/Shade
Native to Ontario
Native to Ontario
Evergreen
Evergreen
Bog or water garden
Bog or water garden

Soil Moisture

Aquatic (submerged)

Growth Rate

Medium

Flowering Time

Summer

Foliage Color

Green (dark)

Landscape uses

Naturalizing

 Suitable Substitutions for Ceratophyllum demersum

Get more info on Elodea canadensis

Elodea canadensis

Canada Pondweed