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.
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.
Tissue-culture plants are the exception — they’re grown in sterile gel and adapt with minimal melting, which is part of what you’re paying for. Plants bought submersed from another hobbyist’s tank also transition with little melt, since they’re already in the right form.
Which Plants Melt Most (and Least)
Heavy melters (expect significant leaf loss)
- Cryptocorynes — infamous for “crypt melt,” sometimes dropping every leaf after any disturbance. They almost always recover from the roots within weeks.
- Stem plants grown emersed — rotala, ludwigia, and hygrophila often shed lower emersed leaves while the growing tips transition.
- Amazon swords — emersed-grown swords typically lose their broad oval aerial leaves and replace them with longer submersed ribbon leaves.
Light melters
- Anubias, java fern, bucephalandra — slow-growing rhizome plants transition gradually; occasional old-leaf melt but rarely dramatic.
- Vallisneria — usually transitions well, though it dislikes the move itself and may sulk for a week.
- Floating plants — minimal melt since their leaves were already at the air-water interface.
The Acclimation Protocol
Step 1: Quarantine or dip first
Before acclimating to your tank’s conditions, make sure you’re not acclimating pests along with the plant. Run new arrivals through our quarantine and dip protocol — it adds days upfront but prevents months of regret.
Step 2: Float to temperature-match (30 minutes)
Float the bag or container in your tank for 20–30 minutes to equalize temperature. Plants are less temperature-sensitive than fish, but a 10°F shock on top of transplant stress is an avoidable insult.
Step 3: Trim before planting
Remove any leaves that are already damaged, yellowing, or heavily algae-covered — they won’t recover and they’ll rot in your tank, feeding algae. For stem plants, trim off the bottom inch and any emersed leaves that look unlikely to adapt; the plant wastes energy maintaining leaves it’s going to shed anyway. Keep the healthy growing tips — that’s where recovery starts.
Step 4: Plant correctly the first time
Follow our planting guide — right depth, crown exposed on rosettes, rhizomes unburied on epiphytes. Every uprooting and replanting restarts the acclimation clock, so get placement right on the first attempt. Decide where each plant goes before it goes in the water.
Step 5: Run a gentle first week
For the first 7 days after planting:
- Moderate light — run your normal photoperiod but consider dropping intensity 20–30% if your light is dimmable. Blast-level light on a melting plant grows algae on the dying leaves, not recovery.
- Stable CO2 — if you inject CO2, keep it consistent. Fluctuating CO2 during acclimation is a melt accelerator. If you’re low-tech, this doesn’t apply — see growing without CO2.
- Half-strength fertilizer — new plants with damaged leaves can’t use full dosing, and the excess feeds algae. Ramp to full strength over 2–3 weeks per our fertilizer schedule.
- No disturbance — don’t move, trim, or “check on” new plants for at least two weeks. Every touch resets root establishment. This is especially critical for crypts.
Step 6: Remove melt, keep the base
As emersed leaves melt, remove the mushy material promptly — decaying leaves release ammonia and grow fungus that can spread to healthy tissue. But never discard the plant while the crown, rhizome, or roots are firm and alive. A crypt that’s lost every leaf but has firm roots is a plant that’s about to recover, not a dead plant. Give it 3–4 weeks before judging.
Telling Normal Melt From Real Problems
Normal transition melt:
- Affects oldest/emersed leaves first, newest growth last
- New submersed leaves emerge even as old ones dissolve
- Roots and crown stay firm and white/green
- Timeline: 1–4 weeks, then obvious new growth
Concerning melt (see our full melting diagnosis guide):
- New growth also melts or emerges deformed
- Rhizome or crown turns mushy and brown — this is rot, not transition
- Entire plant dissolves within days with no new growth after 4+ weeks
- Melting spreads to established plants that weren’t recently moved
Buying Tips to Minimize Melt
- Buy submersed-grown when available — hobbyist-grown cuttings transition with almost no melt.
- Choose tissue culture for sensitive species — crypts and delicate stems establish far more reliably from sterile cups.
- Avoid plants already melting in the store tank — some melt is normal, but a plant that’s mostly mush at purchase has less energy for recovery.
- Transport carefully — keep plants damp and out of direct sun/heat. A plant that dries out or cooks in a hot car melts far worse than one transported properly.
The First-Month Timeline: What to Expect Week by Week
Knowing what’s normal when removes most acclimation anxiety. Here’s the typical timeline for a healthy plant adapting to a new tank:
Week 1: The quiet week
Almost nothing visible happens. The plant is growing roots you can’t see and assessing its new environment. Some species (vallisneria, stem plants) may start shedding their lowest leaves. This is normal. Resist the urge to “help” — no moving, no extra fertilizer, no light changes. The most common beginner mistake is intervening during a week when the correct action is nothing.
Week 2: Melt peaks
This is when emersed leaves give up in earnest. Crypts may drop everything; swords shed their broad aerial leaves; stem plants lose lower foliage. It looks catastrophic and it’s usually fine. Keep removing mushy material, keep conditions stable, and watch the crown and growing tips — if those are firm and green, recovery is already underway.
Week 3: The turn
New submersed-adapted leaves emerge — smaller, thinner, often a slightly different shade of green than the emersed foliage. Stem plant tips start growing visibly; crypts push tiny curled leaves from the crown; swords unfurl narrow ribbon leaves. This is the moment most beginners exhale for the first time.
Week 4+: Established
New growth outpaces melt, and the plant is functionally yours. You can resume full-strength fertilizer, normal trimming, and stop treating it as fragile. Some slow growers (anubias, bucephalandra) take 6–8 weeks to show obvious progress — that’s their normal speed, not a problem.
Acclimating Different Plant Formats
Tissue-culture cups
Sterile, pest-free, and already adapted to high-humidity (not emersed) growth — tissue cultures melt the least of any format. Rinse the agar gel off gently (leftover gel rots and feeds fungus), split the portion into small plantlets, and plant per our planting guide. They establish slowly for the first two weeks, then accelerate. No dip needed, minimal acclimation stress — this is the premium experience you’re paying for.
Potted plants
Remove the pot and strip away the rockwool completely — leftover rockwool traps debris and rots. Tease the root mass apart gently; if it’s a dense mat, splitting it into 2–3 smaller portions actually establishes faster than planting one big clump (more growing points, better water flow around roots). Potted plants are usually emersed-grown, so expect the standard 2–4 week melt cycle.
Bare-root / bunched stems
Typically sold as weighted bunches. Remove any bands, foam, or weights, strip the lower leaves, and plant stems individually or in small groups. Bunched stems from the store are often already transitioning — check for new submersed growth at the tips, which tells you the plant is mid-adaptation and will settle quickly.
Hobbyist cuttings
Already submersed-grown and the fastest to establish — often showing new growth within days. The main acclimation factor is water-parameter difference between the two tanks. Float to temperature-match, plant promptly, and they’ll usually take off with minimal melt. This is why experienced hobbyists prefer trading cuttings over buying potted plants.
Frequently Asked Questions
Should I use a “plant starter” or transplant fertilizer?
Products marketed for transplant shock are mostly B-vitamins and mild hormones. They don’t hurt, but there’s no strong evidence they help aquarium plants specifically. Stable conditions and patience outperform any bottle. Save the money for more plants.
My new plant melted completely — bare crown, no leaves. Is it dead?
Probably not, if the crown or rhizome is firm. Crypts and swords routinely lose 100% of their leaves and regrow from the base within a month. The test is firmness: firm and pale/green means alive; mushy and brown/black means rot. Give firm-but-leafless plants a full 4 weeks before declaring them dead.
Can I speed up acclimation with extra light or CO2?
No — and trying usually backfires. A melting plant can’t use extra light; the excess just grows algae on its dying leaves. Keep light moderate and CO2 stable (not boosted) during acclimation. Growth speed comes from the plant’s own adaptation timeline, which you can’t rush, only avoid delaying.
Should new plants go straight into my main display tank?
After quarantine/dipping, yes — there’s no benefit to a separate “growing-in” tank for most plants. They acclimate to your water fastest in the tank they’ll live in. The exception is very delicate species going into a tank with boisterous fish; give those a few weeks in a calm corner or breeder box first.
The Patience Rule
The single most important acclimation skill is restraint: plant it right, set gentle conditions, remove decay, and then leave it alone for a month. The hobbyists with the best plant growth aren’t doing something clever in week one — they’re simply not interfering in weeks two through four while the plants do what they’ve evolved to do. Melt looks like failure and feels like failure, but in most cases it’s the visible part of a plant successfully becoming yours.