Echinodorus cordifolius

Creeping burhead

Aquarium suitability: yes
Usage: Semi-emersed plant for open tanks, Background, Midground, Specimen plant
Difficulty: easy
Growth: fast
Range and localities: 

Southern and southeastern USA, Mexico, Cuba, northern South America

Height: 30 - 50 cm
Width: 20 - 40 cm

Common names: 
  • Creeping burhead
  • Radican sword

  • Alisma cordifolium L.
  • Echinodorus fluitans Fassett
  • Echinodorus radicans (Nutt.) Engelm.
  • Sagittaria cordifolia (L.) Lam.
  • Sagittaria radicans Nutt.

Habit, plant type:

  • rosette
Botanical name [?]: Echinódorus cordifólius (L.) Griseb.

Major group (unranked): Seed plants: Flowering plants (Angiosperms)
Order: Alismatales
Family: Alismataceae
Genus: Echinodorus


Creeping burhead, or Echinodorus cordifolius, is a very variable species distributed in the eastern and south-eastern parts of the USA to South America. Depending on the author, sometimes Echinodorus ovalis and E. fluitans are considered to belong to the species E. cordifolius, or as species in their own right.
E. cordifolius is mainly found growing emersed on marshlands, ponds or in the shallow water of lakeshores.
Typical forms of E. cordifolius, as they occur in the South of the USA, are high-growing plants with wide heart-shaped leaves. However, there are some populations with narrow-oval to lanceolate leaf blades.
Sometimes, plants sold as E. cordifolius that grow very large and have round heart-shaped leaves might really belong to the species Echinodorus floribundus (from the group of plants related to E. grandiflorus).
E. cordifolius is one of the oldest aquarium plants, and it is also known under the vernacular name radican sword or the synonym Echinodorus radicans.

E. cordifolius differs from E. floribundus in its inflorescence. The flower stalks of E. cordifolius start lying down soon after sprouting, and they always develop adventitious plants (the flower stalks of E. floribundus maintain their upright growth habit for a longer period of time), by longer peduncles (up to 8 cm) as well as by the form of the transparent patterns (pellucid areas) in the leaf tissue (in E. cordifolius: dots and dashes, in E. floribundus only dots).

E. cordifolius is or is not suitable for aquarium cultivation, depending on the population. Under intensive light, long-day conditions and an ample nutrient supply these plants tend to grow floating leaves and aereal leaves that grow out of the water, whereas the submersed leaves die off. In some forms of E. cordifolius, this does not take very long - these plants are only suitable for open tanks. Other aquarium populations are easier to keep submersed, though. Short-day conditions (a dark phase of over 12 hours in succession by night) and the removal of any long-stalked leaves are recommendable. Inflorescences with adventitious plants mainly form on plants that are cultivated emersed.

To be continued...

References and further reading:
  1. (follows)
Light medium to high 
Temperature tolerance 15 to 30 °C
Optimum temperature 20 to 28 °C
Carbonate hardness 0 to 21 °dKH
pH value 5 to 8 
Carbon dioxide (CO2) 10 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: fast

Propagation: Proliferating inflorescences, Rhizomteilung, Seeds, Splitting, cutting off daughter plants

Can grow emersed?: yes

Suited for outdoor cultivation / ponds: yes

Winter hardiness: half-hardy in Germany

References and further reading:
  1. (follows)
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TODO Echinodorus cordifolius is also known as Creeping burhead and Radican sword. 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.