The Amazon Sword (Echinodorus) Care Guide

Amazon Swords (genus Echinodorus) are one of the most forgiving centrepiece plants you can put in a freshwater tank. They form large rosettes, tolerate low light, need no CO2, and given a decent substrate they will grow for years with very little fuss.

They are frequently confused with Helanthium, the chain swords, which look similar as young plants and behave completely differently. If you bought a small grassy sword expecting a carpet, see our Helanthium Care Guide instead.

They feed through their roots, almost entirely

This is the whole of Echinodorus care in one line. Swords are among the heaviest root feeders in the hobby, and liquid fertiliser in the water column does comparatively little for them.

In aquasoil or a nutrient substrate they grow strongly unaided. In plain gravel or sand they need root tabs — several, pushed in around the root mass, replaced every couple of months. A sword producing small pale new leaves while losing old ones is short of root nutrition nine times out of ten.

Yellowing between green veins on older leaves points at iron specifically.

Plant the crown at the substrate line

The crown is the point where the leaf stalks emerge from the root mass. It must sit at the surface of the substrate, not below it.

A buried crown rots, and this is how most newly planted swords are lost in the first few weeks. Bury the roots; leave the crown clear.

Trim long roots back to an inch or two before planting so they anchor cleanly rather than curling back and lifting the plant.

Expect the leaves you bought to die

Nursery swords are grown emersed, above water. Emersed leaves are shorter, broader and stiffer than the submersed form.

When the plant goes underwater those leaves yellow and melt away over two to four weeks while the plant rebuilds from the crown. The submersed leaves that replace them are longer, thinner and often a different colour.

This is normal and not a failure. Remove leaves once they have clearly gone, leave the rest alone, and do not move the plant while it converts.

Light and CO2

Amazon Swords are not demanding. Low to medium light is enough, and they grow under standard LED fixtures without supplemental CO2. They respond well to more of both if you have it — leaves darken, growth speeds up, and red and ozelot varieties colour up more intensely.

Introduce brighter light gradually. A sudden jump triggers melt on older leaves, and excess light on a slow-growing plant with broad leaves mostly grows algae.

Propagation: aerial stalks, not runners

This is the key difference from the chain swords, and worth understanding before you go looking for runners that will never appear.

A mature Echinodorus produces a floral stalk — an aerial runner — that shoots upward from the centre of the rosette or arches across the water column. Along that stalk, plantlets form at intervals, each developing its own leaves and roots.

Leave a plantlet on the stalk until it has three or four leaves and a visible root system, then cut it free and plant it as you would any sword, crown clear of the substrate. You can also weigh the stalk down onto the substrate and let the plantlets root themselves before separating.

Large established plants can occasionally be divided at the rhizome, but this sets the plant back considerably and is not the normal route.

Give them room and depth

Most Echinodorus reach 12 to 20 inches and some go well beyond. A full-size Amazon Sword in a shallow tank grows into the lid, bends over and shades everything around it.

They are midground and background plants for tanks with real depth. In smaller tanks, choose a compact variety or a chain sword instead.

Varieties worth knowing

The genus covers a lot of ground. Echinodorus bleheri is the classic — large, all-green, and the easiest entry point. Ozelot Red and Ozelot Green bring mottled, patterned foliage without getting as large. Marble Queen is a variegated cream-and-green option. For a smaller rosette, Echinodorus parviflorus 'Tropica' stays compact enough for midground placement.

Common issues and fixes

Melting after planting: Normal for the first two to four weeks as the plant sheds emersed-grown leaves. Trim what has clearly gone and wait.

Yellowing leaves: Usually nitrogen or iron. Add root tabs first — this is a root-fed plant — then check liquid dosing.

Stunted, small new leaves: Root nutrition, or a potassium and micronutrient shortfall in fast-growing high-light tanks.

Holes or translucent patches: Usually potassium deficiency. Increase dosing and watch the next few leaves.

Algae on the leaves: Too much light for a plant that turns over this slowly. Shade it or reduce the photoperiod.

Quick reference

• Light — Low to medium
• CO2 — Not required
• Water — 72–82°F, pH 6.5–7.5
• Substrate — Required; heavy root feeder
• Placement — Midground to background
• Mature height — 12–20 in and beyond, by variety
• Propagation — Plantlets on aerial floral stalks
• Difficulty — Beginner

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