Echinodorus argentinensis

Species description

Care, breeding and tankmates

Plant profile

Placement

Midground

Due to its immense size, it must be placed in the background of large aquariums or used in paludariums and open-top tanks. In a standard aquarium, its leaves will quickly reach the surface, folding over and shading everything below it. If grown emersed, the leaves will robustly stretch out of the water. Provide a very wide berth for its expansive root system and broad canopy.

Botanical form

Rosette

This species features very long, sturdy petioles ending in large, oval-to-spatulate green leaves. When submerged, the leaves are slightly narrower and more delicate. When allowed to grow emerged above the water line, the leaves become thicker, tougher, and deeply veined, resembling a terrestrial houseplant. It has an incredibly massive, thick root system.

Growth

Medium

Its growth rate is exceptionally fast, especially when its leaves breach the water surface and access atmospheric CO2. Submerged, it will rapidly grow toward the light, producing long petioles. You must be prepared for frequent pruning if trying to keep it submerged in an enclosed tank. It will quickly outgrow anything smaller than a 75-gallon aquarium.

Substrate

High

Column fertilization

Recommended

Liquid fertilization provides necessary trace elements but is secondary to root feeding for this giant. Dosing potassium into the water column can prevent the older, massive leaves from developing pinholes. It can absorb nutrients effectively through its leaves, but its sheer size means it relies heavily on its roots. Do not rely solely on liquid fertilizers.

Root fertilization

Required

A deep, nutrient-rich soil substrate is absolutely mandatory for long-term success. If using inert gravel, you must push several high-quality root tabs deep under the crown every month. The root system will quickly spread across the entire tank bottom, aggressively seeking out nutrients. Starving the roots will cause the plant to decline rapidly.

Trimming

Occasional

If kept in a closed aquarium, maintenance will involve frequently cutting off leaves that reach the surface to prevent severe shading. Cut the long petioles as close to the base as possible. For open-top tanks, trim away any submerged leaves that begin to yellow as the plant transitions to emerged growth. Pruning is necessary just to keep its size manageable.

Propagation

Division

Propagation is straightforward; mature plants send out long, thick flower stalks. If grown emerged, these stalks will produce white flowers that can yield seeds. Submerged or emerged, the nodes on the stalk will also develop plantlets. Once the plantlets have a sturdy root system, they can be snipped and replanted.

Sensitivity

Moderate

Echinodorus argentinensis is practically indestructible once established, handling a wide range of temperatures and water hardness. Its main 'sensitivity' is to small tanks, where it will suffer if cramped or heavily pruned too often. It strongly prefers to grow out of the water and may continuously shed submerged leaves in favor of emerged ones. It requires very strong lighting.

Layout role

Background

This plant is best utilized as a dramatic centerpiece in a paludarium, where its massive emerged leaves can create a jungle canopy. In open-top aquariums, it adds a stunning three-dimensional element breaking through the water surface. It is generally too large and disruptive for standard, fully submerged aquascapes. It provides excellent structure and cover for large fish species.