Hydrilla verticillata

Water thyme

Aquarium suitability: yes
Usage: Background
Difficulty: very easy
Growth: very fast

Availability [?]: 
  • occasionally available commercially

Common names: 
  • Water thyme

  • Hydrilla lithuanica

Habit, plant type:

  • stem
Botanical name [?]: Hydrílla verticilláta (L. f.) Royle

Major group (unranked): Seed plants: Flowering plants (Angiosperms)
Order: Alismatales
Family: Hydrocharitaceae
Genus: Hydrilla


The aquatic plant Hydrilla verticillata, aka Esthwaite waterweed, is easily confused

with waterweeds of the genera Egeria and Elodea. It is a variable species with many different-looking forms. Its main areas of distribution are the temperate to tropical climate zones of Asia and Australia, Eastern Africa and parts of Europe, however, it has been introduced in almost all regions of the world by human activity. In the USA, H. verticillata is an invasive, hard-to-control aquatic weed that outpopulates native aquatic plants.

The stems of H. verticillata can grow to a length of up to 2 metres and ramify moderately. Besides upright stems, the plant often also grows runner-like creeping shoots as well as subterranean sprouts with tuberous turions (winter buds) at their ends. In these, Esthwaite waterweed survives unfavourable periods inside the ground.
There are whorls of 3 to 9 leaves on each node. The leaf margin is serrate, which can clearly be seen with the naked eye (unlike Egeria densa and Elodea canadensis, whose leaf margin looks smooth to the naked eye and whose fine serration is only visible with a magnifying glass). On the older stem areas, the internodes are longer than the leaves as a rule (in Egeria they are shorter than the leaves).

To be continued...

References and further reading:
  1. follows
Light low to high 
Temperature tolerance 4 to 30 °C
Optimum temperature 20 to 27 °C
Carbonate hardness 2 to 21 °dKH
pH value 5 to 9 
Carbon dioxide (CO2) 5 to 40 mg/l
Nitrate (NO3-) 10 to 50 mg/l
Phosphate (PO43-) 0.1 to 3 mg/l
Potassium (K+) 5 to 30 mg/l
Iron (Fe) 0.01 to 0.5 mg/l

Growth: very fast

Propagation: Fragmentation, Runners, Cuttings

Can grow emersed?: no

Suited for outdoor cultivation / ponds: yes

Winter hardiness: half-hardy in Germany

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TODO Hydrilla verticillata is also known as Water thyme. TODO

Wasserpflanzen sind ein fester Bestandteil der meisten Aquarien. Beim Aquascaping, dem Naturaquarium, Biotop-Aquarium oder dem Gesellschaftsaquarium sind Wasserpflanzen nicht nur für die Wasserqualität entscheidend, sondern sorgen auch stets für eine optische Aufwertung des Aquariums.