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Hydrilla verticillata - (L.f.)Royle.
                 
Common Name Hydrilla, Waterthyme
Family Hydrocharitaceae
USDA hardiness 4-8
Known Hazards None known
Habitats Grows in a variety of aquatic habitats, from acidic to basic, oligotrophic to eutrophic, fresh to brackish, and from a few centimeters deep to a meter or more if light penetrates that deeply[270].
Range A cosmopolitan plant, it is hard to know the areas where it is truly native[270]..
Edibility Rating  
Other Uses  
Weed Potential Yes
Medicinal Rating  
Care
Fully Hardy Water Plants Full sun

Summary

Hydrilla verticillata Hydrilla, Waterthyme


Hydrilla verticillata Hydrilla, Waterthyme
   
Physical Characteristics
 
Hydrilla verticillata is a ANNUAL/PERENNIAL at a fast rate.
It is hardy to zone (UK) 5. It is in flower from May to October, and the seeds ripen from Jun to October. The flowers are monoecious (individual flowers are either male or female, but both sexes can be found on the same plant) and are pollinated by Water.Suitable for: light (sandy), medium (loamy) and heavy (clay) soils. Suitable pH: neutral and basic (alkaline) soils and can grow in very alkaline soils.
It cannot grow in the shade. It can grow in water.

Synonyms

Habitats
 Pond;
Edible Uses
None known
Medicinal Uses


Plants For A Future can not take any responsibility for any adverse effects from the use of plants. Always seek advice from a professional before using a plant medicinally.

Detergent;  Miscellany.

Used in the treatment of abscesses, boils and wounds, especially if there is debris in the wound[147]. A dried powder of the plant is applied to cuts and wounds to help accelerate healing[272].
Other Uses
Miscellany.

The plant is used in sugar refinery[177]. No more details are given.
Cultivation details
A submerged water plant, it prefers growing in alkaline water[200]. A good oxygenator for ponds, the plant forms a large mass with stems up to 2 metres long[1, 200]. This is a very vigorous species which can regrow from even small sections of the plant. Stem fragments become rooted by fine, unbranched adventitious roots and soon produce vegetative reproductive structures from both subterranean and erect stems[270]. Tubers produced on subterranean stems are pale brown; those produced on erect stems are dark olive-green and covered with short, stiff scales. Both types germinate quickly to produce new stems[270]. This species has often invaded native habitats, clogging waterways and crowding out native species of flora and fauna[274]. It is considered a noxious weed in many areas[274]. Plants can be monoecious or dioecious. Dioecious plants (usually female) are triploid forms whilst monoecious plants are diploid[274]. Male flowers are released from the plant under water. They float to the surface where they release their pollen to fertilize female flowers[274].
Propagation
Seed - it is quite likely that seed must be kept moist in order to maintain viability. If seed can be obtained, it is probably best sown immediately in a greenhouse in soil covered with water. Tubers - plant immediately in soil covered in water, Division - even small sections of stem will soon start producing roots when placed in water.

Books by Plants For A Future

Other Names
Found In
Weed Potential

Right plant wrong place. We are currently updating this section. Please note that a plant may be invasive in one area but may not in your area so it’s worth checking.

Conservation Status
IUCN Red List of Threatened Plants Status :
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Expert comment
 
Author
(L.f.)Royle.
Botanical References
200270274
Links / References
For a list of references used on this page please go here
Readers comment
 
Elizabeth H.
Phoebe Wilson Wed Jun 21 18:49:04 2000
I recently came upon your 'Plants for a Future' website at:

http://metalab.unc.edu/pfaf/cgi-bin/arr_html?Hydrilla+verticillata

where there is erroneous information about Hydrilla verticillata. If you really believe the following information apparently supplied by 'Plants for a Future', made on that website:

Known Hazards: None known

then someone needs to do some more research before they provide information to other people. Just visit: http://aquat1.ifas.ufl.edu/prohib.html http://aquat1.ifas.ufl.edu/hydrinex.html to see the problems associated with Hydrilla verticillata.

Since you live in the UK, you probably have no way of knowing about these problems, but I assure you they are very real. That plant is considered an extreme pest, to the point where they are considering some kind of biocontrol. Here in Florida, we certainly would never encourage cultivation of such a plant.

I just thought you might like to update your information.

Elizabeth H.
sangeeta dhote Thu Aug 23 2007
Hydrilla verticillata can be used for water purification as it removes pollutants from water and waste water.
Elizabeth H.
Debra Pipkins Sun Feb 3 2008
can this plant affect creatinine levels in the kidney?
Elizabeth H.
deepank arya Wed Feb 13 2008
it is very beautiful for how those how like flowers.it is most use in study
Elizabeth H.
Mon Apr 13 2009
I NEED SOME INFO ON HOW HUMANS INTERACT ON THIS PLANT SPECIES. PLEASE NOTE THAT.
Elizabeth H.
Dr Manisha Acharya Tue Jan 12 2010
I need Hydrilla verticillata powder,please advise who can supply.
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Subject : Hydrilla verticillata  

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