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Rotala sp. 'Vietnam'

°C
°dKH
Aquarium suitability: yes
Usage: Background, Midground
Difficulty: medium
Growth: fast

Habit, plant type:

  • stem
Major group (unranked): Seed plants: Flowering plants (Angiosperms)
Order: Myrtales
Family: Lythraceae
Genus: Rotala

Description: 

The Japanese company Rayon Vert was the first to introduce Rotala sp. 'Vietnam' to the hobby. This Rotala hasn't been identified yet, but it is known that it populates shallow waters and wet ground in its native habitat. The submersed form is said to look very much like Rotala hippuris, however, it still has to be cleared up whether it indeed belongs to that species.

The requirements Rotala sp. 'Vietnam' are quite similar to those of Rotala wallichii. Moderate light leads to an overall green plant with red stems, whereas intensive light leads to a pretty golden colour. It also needs CO2 injection in order to grow well. The phosphate content of the water should be around 1 to 2 mg/l in order to obtain thicker stems, smaller internodes and a reddish tint. Iron and micronutrients should also be present in ample amounts. An iron deficiency results in small, weakly-coloured stems; an extreme lack may even cause the vegetation point to die off.

The growth habit of this form can be compared to that of Rotala wallichii. Rotala sp. 'Vietnam' grows vertically and produced many lateral shoots, especially if long shoots are allowed to grow along the water surface. Propagate like other stem plants: Make cuttings of top or lateral shoots and re-plant in the substrate.

Rotala sp. 'Vietnam' can be used in the middle- and background of a great number of layout types and is especially suited for aquascapes dominated by stem plants. It contrasts beautifully against red as well as green plants.

References and further reading:
  1. follows
Light medium to high 
Temperature tolerance 15 to 30 °C
Optimum temperature 22 to 28 °C
Carbonate hardness 0 to 12 °dKH
pH value 4.5 to 7 
Carbon dioxide (CO2) 20 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: Cuttings

Can grow emersed?: yes

Suited for outdoor cultivation / ponds: unknown

Winter hardiness: unknown

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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.