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Ceratophylum demersum (Hornwort)


  1. planting hornwort?
    by "Fishhead/Windsong" <fishhead/> (25 Oct 97)
  2. C. demersum
    by "Roger S. Miller" <rgrmill/> (Tue, 18 Jul 2000)

planting hornwort?

by "Fishhead/Windsong" <fishhead/>
Date: 25 Oct 97
Newsgroup: rec.aquaria.freshwater.plants

I've had this hornwort for years and it's truly a weird plant.  Indoors in
my tanks it floats & is always rootless.  In the pond outside (zone 6) it
sinks mostly to the bottom and I was shocked to find an old piece ROOTED
into the gravel along it's side.  The roots were strange white wiry things
holding the plant to the gravel.  I never saw this before.  Had i known it
was rooted I would have left it alone.  This is a fast growing plant &
nitrate USER big time.
Carol..... ICQ #2982961

~~}<(((o>~~~><(((ö>~~~}<(((Ô>~~~><(((ö>~~ SNIP

> Hornwort never puts out roots.  If you stick it in the gravel  or, in my
>  experience use the weights, the ends will eventually rot and break free.


C. demersum

by "Roger S. Miller" <rgrmill/>
Date: Tue, 18 Jul 2000

On Tue, 18 Jul, 2000 Susi Barber wrote:

> I have Ceratophyllum submersum (Tropical Hornwort), which has no roots, and is
> a floating plant.  "Demersum" I think means it should be grown emersed, ie in
> the air, not underwater - experts please advise.

C. demersum is an obligate submersed plant.  It has no roots but can
anchor itself to the bottom with modified leaves.  It's often found
floating.  The specimens I have floated by me while I waded in the Rio

> Anyway, they need a lot of light - losing leaves suggests to me not enough
> light.  It should also be floating at the top of the tank if it is
> "submersum", rather than anchored to the bottom of the tank with a stone.

C. demersum (like most plants) grows best in bright light, but it can
adapt to live in rather dim light.

As to Klaus' original problem with the plant dropping leaves, I think this
could be from an earlier stress, from a change in conditions, or from fish
picking at the plant.  None of my fish will regularly chew up C. demersum
but a couple weeks ago my American-Flag fish took a sudden liking to it
and stripped a stem bare.  Now they've changed their minds about it and
it's recovering.

Roger Miller

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