Echinodorus opacus "Rataj"

Dark swordplant

Echinodorus opacus "Rataj"

Dark swordplant

  • Small Echinodorus wild type
  • Distinctive appearance
  • Spreading habit
  • Slow growth
  • Rarity
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Echinodorus opacus is a remarkable, beautiful swordplant wild type that originates from Paraná state in southeastern Brazil, occurring in fast-flowing rivers. Described as a species by Karel Rataj in 1970, it is likely a natural hybrid from the Echinodorus grandiflorus species group. There are different plants under that name, however our plant is a small form that is already cultivated since the 1970's as Echinodorus opacus. Due to its low propagation rate it is still a rarity. Only recently the name addition "Rataj" is used to designate this small E. opacus form.
Very different from the many big, fast-growing Echinodorus types, this plant grows slow and hardly flowers. It developes a creeping rhizome and hard, stiff, dark green leaves with ovate blade. It is particularly attractive through its light nervature that contrasts with the darker leaf tissue.

Echinodorus opacus "Rataj" is not really demanding and is content with medium light intensity, however it benefits much from nutrient-rich substrate and CO2 supply. The temperatur may drop below 20 °C, corresponding to the subtropical climate in southern Brazil with already quite cool winters. With the growth of the rhizome, the leaf rosette shifts slowly on the ground. Long rhizomes can be cut into pieces for propagation. Side shoots will grow from buds on the rhizome parts.

This rare Echinodorus wild type is a special gem in aquariums, looking best as an adccent plant in the midground, in tall tanks also in the foreground. Old, broad specimens with many leaves are especially attractive. This plant should also be interesting for naturally designed aquariums, imitating a river biotope with pebbles and boulders.



Aquasabi is our own brand, under which we offer high-quality products with a very good price-performance ratio. Carefully selected CO2 diffusers, CO2 bubble counters or lily pipes are just some of the items we sell under this brand and which will surely add to the value und the beauty of any aquascape. For this reason, many aquascapers and planted tank enthusiasts use products by Aquasabi.

Besides the good price-performance ratio, our main focus is on the satisfaction of our customers. This is the reason why our doors are always open for those who need help with our products.

When it comes to special aquatic plants, water plants from Aquasabi are just the thing for you. We offer rarities from our own cultivating tanks or import them specifically. These plants are otherwise hard to come by, and most of them cannot be purchased from other shops. We have high quality standards, which make Aquasabi plants a good choice for aquascapers, planted tank enthusiasts and aquatic plant collectors who want to enrich their tanks with rare aquatic plants. Special mosses, particular stem plants, hard-to-come-by ferns or very rare forms of the genus Bucephalandra are only a few of the plants we are proud to offer.

General information

Item no.
Weight 0,10 kg
Shipping weight 0,10 kg

Customers ask customers

You have questions about this product? Ask other customer or our support team about this product!

The origin of this E. opacus is from Rataj farm?
Shogo S.
Feb. 2024
Aquasabi Support
Feb. 2024
The small form of E. opacus was described by Karel Rataj in 1970 and is likely a natural hybrid. The name addition "Rataj" is used to designate this form. However, the individual plants in stock are not originated in Rataj farm, but in european plant nurseries.

Customer reviews

This item has been rated 5 out of 5 stars
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Peter K.
Perfect choice
25th July 2018
Echinodorus opacus "Rataj"
Echinodorus opacus "Rataj"

Really beautiful plant which deserves best place in your tank. I received one in perfect condition, with huge root system. It adapted perfectly in my tank and soon started to grow. (read more)

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