Echinodorus — the Amazon swords — are the most iconic aquarium plants in the world, and the genus is far more varied than the single "Amazon sword" most beginners know. From the compact 'Ozelot' to the giant E. bleheri, from green workhorses to red-flamed showpieces, there's a sword for every tank from 10 gallons to 200. These 8 Echinodorus varieties are compared head-to-head: size, color, difficulty, and which tank each one belongs in.
The Sword Formula
All Echinodorus share the same care: they're heavy root feeders (root tabs are mandatory in inert substrates), they grow from a central crown that must stay unburied, they dislike being moved, and they propagate via flower spikes bearing baby plantlets. Get those four things right and every variety on this list thrives. Get them wrong and every variety struggles equally — swords are consistent that way. Our rosette plant guide covers the general growth form; this is the variety-level detail.
8 Echinodorus Varieties Compared
1. Echinodorus amazonicus (Amazon Sword)
The classic. Bright green, lance-shaped leaves reaching 16–20 inches, fast-growing for a sword, and tolerant of a wide range of conditions. The default centerpiece for tanks 30 gallons and up — the plant most people picture when they hear "planted aquarium." Undemanding beyond root tabs; the benchmark all other swords are measured against.
2. Echinodorus bleheri (Broad-leaf Amazon Sword)
Often sold interchangeably with amazonicus, but distinct: broader, more oval leaves on a plant that grows even larger (20+ inches). If amazonicus is the standard, bleheri is the extra — choose it for big tanks where you want maximum presence. Same easy care, bigger payoff. In tanks under 40 gallons it's too much plant; in 75+ it's perfect.
3. Echinodorus 'Ozelot'
The patterned sword: green leaves heavily spotted and mottled in red-brown, like a jaguar's coat — each leaf uniquely marked. Stays more compact than the big green swords (12–16 inches), suiting medium tanks. The patterning needs no CO2 or special treatment; it's genetic. The best "interesting" sword for beginners who want more than plain green. A standout in our patterned-plant roundup too.
4. Echinodorus 'Red Flame'
New leaves emerge deep red, maturing through bronze to green with red veins — a sword with genuine color dynamics. More compact (10–14 inches) than the classic swords, making it a midground option in medium tanks. The red is strongest in new growth under good light; keep it fed and lit and the show continues indefinitely.
5. Echinodorus 'Red Diamond' / 'Red Devil'
The red sword cultivars: selected for intense, persistent red coloration far beyond 'Red Flame's new-growth flush. These are the swords for aquarists who want red without high-tech stems — the color holds in mature leaves under strong light. Slightly more demanding (wants good light and rich roots for best color) but still fundamentally a sword: feed the roots, leave it alone.
6. Echinodorus parviflorus 'Tropica'
The compact sword: a rosette of broad, hammered-texture dark-green leaves staying under 6 inches — a true foreground/midground sword for small tanks. It brings sword character (bold rosette, root-feeding, long-lived) to nano and 10-gallon setups that can't fit its giant cousins. Slow-growing and undemanding; the small-tank sword specialist.
7. Echinodorus cordifolius (Radican Sword)
The giant: heart-shaped leaves on a plant that reaches 2+ feet and tries to grow emersed out of the tank (it will — flower spikes and all). For very large tanks and indoor ponds, it's magnificent; for anything under 75 gallons, it's a mistake. Buy it when you have the space; admire it as the monster it wants to be. Our pond guide includes it as a marginal giant.
8. Echinodorus 'Aquartica' / marble cultivars
The newer marble and variegated sword cultivars — white-cream marbling on green, in the 'Ozelot' size range. They're collector-priced and slower than standard swords (less chlorophyll), but they bring genuinely unique patterning to the sword form. For the sword enthusiast who's grown everything else and wants the unusual. Stability is good; treat like 'Ozelot' with slightly more light.
Comparison Table
| Variety | Height | Color | Tank minimum | Character |
|---|---|---|---|---|
| E. amazonicus | 16–20" | Bright green | 30 gal | The classic, does everything |
| E. bleheri | 20"+ | Green, broad | 55 gal | Maximum presence |
| 'Ozelot' | 12–16" | Spotted red-brown | 20 gal | Patterned, beginner-friendly |
| 'Red Flame' | 10–14" | Red new growth | 20 gal | Color dynamics |
| 'Red Diamond' | 12–16" | Persistent red | 30 gal | Reddest sword |
| parviflorus 'Tropica' | 4–6" | Dark green, textured | 10 gal | Nano sword |
| E. cordifolius | 24"+ | Green, heart-shaped | 75 gal | The giant |
| Marble cultivars | 12–16" | White-marbled | 20 gal | Collector's sword |
Sword Care Masterclass
Root feeding schedule
In inert substrate: one root tab per sword every 2–3 months, pushed into the substrate 2–3 inches from the crown. In aquasoil: tabs after month 6–12 as the soil depletes. Signs of hunger: yellowing outer leaves (nitrogen), pale new growth with green veins (iron), small new leaves (general deficiency). A well-fed sword is deep green, broad-leafed, and constantly unfurling.
The flower spike
Mature, happy swords send up emergent flower stalks — sometimes 3+ feet long — with small white flowers that develop into baby plantlets. In open-top tanks let it bloom (see our flowering guide); in lidded tanks, pin the stalk underwater to root plantlets while attached, then separate once they have roots and several leaves. Free swords, courtesy of a thriving mother plant.
Pruning
Remove outer leaves at the base as they age — yellowing, algae-covered, or damaged leaves drain energy. Pull firmly downward and outward; the leaf separates at the crown. Never cut a leaf mid-blade (the stub rots). A sword with 15–20 healthy leaves is at peak; more than that and the inner leaves shade out — thin to keep it vigorous.
Moving (don't)
Swords build massive root systems; moving one destroys months of growth and usually triggers melt. Choose the spot with the mature size in mind — that 4-inch pot plant becomes a 20-inch centerpiece — and commit. If you must move it, trim the roots by a third, replant at the right crown height, and expect a 3–4 week sulk.
A reliable pick here is Seachem Flourish Tabs.
A reliable pick here is API Root Tabs.
Propagating Swords: The Flower Spike Method
Swords propagate themselves — your job is just to assist. When a flower stalk emerges and develops plantlets, wait until each baby has 3–4 leaves and visible roots (typically 4–8 weeks on the stalk). Then either pin the stalk to the substrate so plantlets root while attached, or snip plantlets off and plant them directly like any rosette — crown exposed, roots spread. A single flower spike can yield 5–15 babies, and a happy mother plant produces multiple spikes per year. Pot up extras for trades: sword plantlets are hobby currency, and a mature 'Ozelot' or 'Red Flame' mother generates a steady supply. Adventitious plantlets also appear directly on old leaves of some varieties — treat them the same way. Between spikes, swords occasionally split at the crown into two growing points; divide these with a sharp knife during a rare rescape, ensuring each division has roots and leaves.
Frequently Asked Questions
Which sword is best for a 20-gallon tank?
'Ozelot' or 'Red Flame' — both stay 10–16 inches, bring color/pattern interest, and won't overwhelm a medium tank. Avoid amazonicus and bleheri (too big) and parviflorus 'Tropica' is an option if you want a smaller accent. One sword per 20 gallons is plenty; they're specimen plants, not fillers.
Why are my sword's new leaves small and pale?
Root hunger — the most common sword problem. Push fresh root tabs near the crown; improvement shows in new leaves within 2–3 weeks. If tabs are fresh and growth is still poor, check light (swords want moderate+) and consider whether the crown is buried (unbury it — buried crowns rot and stunt the plant).
How long do Amazon swords live?
Years — often 5+ in stable tanks, with specimens a decade old in the hobby. They're among the longest-lived aquarium plants. A mature sword becomes a tank landmark; plan aquascapes around it rather than treating it as temporary. The longevity is part of the appeal.
Can swords grow in gravel without aquasoil?
Absolutely — gravel plus root tabs grows excellent swords. The substrate texture matters far less than the nutrients in it. See our gravel-growing guide: plain gravel, regular tabs, and your sword will never know the difference.
My sword is sending leaves out of the water — what do I do?
It's either cordifolius being itself (let it — the emersed leaves and flowers are spectacular in open-top tanks) or another variety that's outgrown the tank. For non-giant varieties, emersed growth signals it's time to divide or replace with a smaller cultivar. Trimming emersed leaves just prompts more; the plant is telling you about its size.
Are red swords harder than green swords?
Slightly — red cultivars want stronger light to hold their color and are a bit slower-growing (less chlorophyll in red leaves). But the care fundamentals are identical: root tabs, unburied crown, don't move it. If you can grow a green sword, you can grow a red one; just give it better light.
Pick Your Sword
Eight varieties, one formula: feed the roots, expose the crown, plant once, and be patient. Whether you choose the classic amazonicus, the spotted 'Ozelot', or the compact parviflorus for a nano tank, you're getting one of the hobby's most rewarding plants — a living centerpiece that grows more impressive every year. The sword you plant today is the tank landmark of 2030.