Helanthium sp. "Longifolius"

Aquarium suitability: yes
Usage: Midground, Nano tanks, Foreground, group
Difficulty: easy
Growth: fast
Range and localities: 

unbekannt, wahrscheinlich Süd- oder Mittelamerika

Availability [?]: 
  • rarely or not available commercially
  • rarely or not available from other aquarists

  • Echinodorus spec. ''Longifolius''

Habit, plant type:

  • rosette
Major group (unranked): Seed plants: Flowering plants (Angiosperms)
Order: Alismatales
Family: Alismataceae
Genus: Helanthium


Helanthium sp. "Longifolius" was known as Echinodorus sp. "Longifolius" in the hobby many years ago, however, it was almost forgotten afterwards. It remained in cultivation e.g. in the Botanical Garden Halle on Saale, and some hobbyists also have it in their aquaria. It belongs to the group of "small", runner-forming sword plants that have recently been placed in a genus of their own (Helanthium)

Helanthium sp. "Longifolius" is a medium-sized runner-forming sword plant with narrow grass-like leaves. It tends to grow higher than e.g. Helanthium bolivianum "Quadricostatus" or H. bolivianum "Latifolius", however, it stays considerably smaller than H. bolivianum "Angustifolius".
Its submersed leaves are sometimes not as clearly band-shaped than those of the latter, but narrow towards the leaf basis, forming a stalk-like part. This characteristic discerns H. sp. "Longifolius" from the similarly narrow-leaved Helanthium sp. "Angustifolius, small form", which also stays quite small but whose leaves do not narrow much towards the basis.

The emersed rosulate leaves of Helanthium sp. "Longifolius" are distinclty smaller than the submersed leaves and have a narrow-lanceolate form.

The plant reproduces very fast through runners forming long, sometimes reddish internodes comparable to those of H. bolivianum "Angustifolius". After a short time you will get a nice group of loose, light green leaf rosettes.

-To be continued-

Light medium to high 
Temperature tolerance 10 to 30 °C
Optimum temperature 20 to 26 °C
Carbonate hardness 0 to 14 °dKH
pH value 5 to 7.5 
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: Runners

Can grow emersed?: yes

Suited for outdoor cultivation / ponds: unknown

Winter hardiness: not hardy in Germany

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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.