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Ceratophyllum demersum (Hornwort)
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2 hours care
per year
per year
0.1m
Max height
Max height
1.5m
Max spread
Max spread
5-10 years
To maturity
To maturity
Plant details
Botanical name
Ceratophyllum demersum
Other names
Hornwort, Cedar moss, Coon tail, Fish blankets, Morass weed, Rigid hornwort
Genus
Ceratophyllum Ceratophyllum
Species
C. demersum - C. demersum is a submerged, aquatic perennial with whorls of forked, brittle, dark green leaves. Tiny flowers, white male and green female, bloom in summer from the leaf axils.
Ceratophyllum demersum is: Deciduous
Habit
Spreading
Flower
White, Green in Summer; Dark-green in Autumn
Foliage
Dark-green in Spring; Dark-green in Summer
How to care
Watch out for
Pests
Generally pest free
Diseases
Generally disease free
General care
Propagation
Take stem cuttings and float in water.
Propagation methods
Stem tip cuttings
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Where to grow
Ceratophyllum demersum (Hornwort) will reach a height of 0.1m and a spread of 1.5m after 5-10 years.
Suggested uses
Aquatic, Low Maintenance
Cultivation
Grow in water 30-90cm deep in full shade to full sun. Plants float freely so do not require baskets. Dies back in winter but stem buds overwinter in bottom mud and grow in spring.
Soil type
Clay, Loamy
Soil drainage
Pond/In water
Soil pH
Acid, Alkaline, Neutral
Light
Partial Shade, Full Shade, Full Sun
Aspect
North, South, East, West
Exposure
Exposed, Sheltered
UK hardiness Note: We are working to update our ratings. Thanks for your patience.
Hardy (H4)
Companion plants
We do not currently have companion plants added for this plant.
Botanical name
Ceratophyllum demersum
Other names
Hornwort, Cedar moss, Coon tail, Fish blankets, Morass weed, Rigid hornwort
Genus
Ceratophyllum Ceratophyllum
Species
C. demersum - C. demersum is a submerged, aquatic perennial with whorls of forked, brittle, dark green leaves. Tiny flowers, white male and green female, bloom in summer from the leaf axils.
Foliage
Deciduous
Habit
Spreading
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Colour
Flower
White, Green in Summer; Dark-green in Autumn
Foliage
Dark-green in Spring; Dark-green in Summer
How to care
Watch out for
Pests
Generally pest free
Diseases
Generally disease free
General care
Propagation
Take stem cuttings and float in water.
Propagation methods
Stem tip cuttings
Monthly care advice
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Where to grow
Ceratophyllum demersum (Hornwort) will reach a height of 0.1m and a spread of 1.5m after 5-10 years.
Suggested uses
Aquatic, Low Maintenance
Cultivation
Grow in water 30-90cm deep in full shade to full sun. Plants float freely so do not require baskets. Dies back in winter but stem buds overwinter in bottom mud and grow in spring.
Soil type
Clay, Loamy
Soil drainage
Pond/In water
Soil pH
Acid, Alkaline, Neutral
Light
Partial Shade, Full Shade, Full Sun
Aspect
North, South, East, West
Exposure
Exposed, Sheltered
UK hardiness Note: We are working to update our ratings. Thanks for your patience.
Hardy (H4)
USDA zones
Zone 10, Zone 9, Zone 8, Zone 7, Zone 6, Zone 5, Zone 4, Zone 3
In order to add a note on this plant, please add this plant to your plant lists.
| This plant likes... | Garden match | |
| Soil types: | Clay, Loamy | Tell us... |
| Soil drainage: | Pond/In water | Tell us... |
| Soil pH: | Acid, Alkaline, Neutral | Tell us... |
| Light: | Partial Shade, Full Shade, Full Sun | Tell us... |
| Aspect: | North, South, East, West | Tell us... |
| Exposure: | Exposed, Sheltered | Tell us... |
| Hardiness: | Hardy (H4) | Tell us... |
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