Amazon sword care comes down to three things: feed the roots, never bury the crown, and give it space — this plant reaches well over 2 feet at maturity and wants a 20-gallon tank or larger. It needs no CO₂, tolerates a wide range of water, and the "dying" phase most new owners panic over is a normal transition called the melt.
You bought it because it looked unreal in the shop — a green fountain of leaves that makes a tank feel finished. Three weeks later, you're holding a brown, translucent mess over the trash can. Don't throw it out. That plant isn't dying. It's changing clothes.
Amazon Sword Care Parameters at a Glance
| Parameter | Ideal Range | Notes |
|---|---|---|
| Light | Low to moderate | Very tolerant; no high-tech fixture needed |
| Temperature | 72–82°F (22–28°C) | Comfortable across most tropical setups |
| pH | 6.5–7.5 | Flexible; rarely the problem |
| CO₂ | Not required | Speeds growth but is never necessary |
| Feeding | Heavy root feeder | Liquid fertilizer barely registers alone |
| Substrate Depth | 2.5–3+ inches | The root system grows genuinely enormous |
| Max Size | Over 2 feet | Plan the background around it |
| Tank Size | 20 gallons and up | Ideally, a tall tank |
The Melt That Fools Almost Everyone
Nurseries grow swords emersed — up out of the water in humid greenhouses, with thick leaves built for air. Submerge those leaves and they collapse into brown mush. Meanwhile, at the base, the plant quietly pushes out a new set: thinner, softer, made for life underwater.
Give it a month. Snip the melting leaves at the base, leave the roots undisturbed, and wait. Most "dead" Amazon swords are just mid-costume-change — more on this in our dying planted tank rescue guide.
Why It Still Wears the Crown
Carpet plants and fussy stem plants get the attention these days, but nothing anchors a tank like one mature sword. Broad leaves give a background genuine depth, angelfish lay eggs on them, shy fish shelter underneath — all without CO₂ or high-tech gear.
A single healthy PlantedPro Amazon Sword outperforms a dozen temperamental stems and arrives ready to transition rather than half-starved from weeks in a bare store tank.
Feed the Roots, or Don't Bother
Amazon swords eat through their roots, and liquid fertilizer alone barely registers. Left in plain inert gravel, the plant slowly starves — leaves yellow, pinholes appear, growth thins out.
The long-term fix is substrate, not surface dosing. PlantedPro Aquarium Soil releases nutrients directly into the root zone for months — exactly what a heavy feeder needs. With inert gravel, root tabs near the base work as the standard fix; refresh every month or two. Give it real depth, too — three inches of substrate — since the root system will eventually claim the whole corner of the tank.
Don't Bury the Crown
This mistake kills more swords than bad water ever will. Roots go into the substrate — the crown, where every leaf emerges, stays above it. Bury it and the plant rots from the middle out.
Tips Worth Stealing
- Trim old leaves at the base, never the tips — a chopped leaf stays chopped.
- Yellow leaves with pinholes mean hunger — address the substrate first.
- Expect the melt in a new tank. Patience beats panic.
- Propagate for free. A mature sword sends up plantlets on a stalk — let each grow a few leaves and roots, snip it free, and replant.
FAQ
(Q) Why is my new Amazon sword melting and turning brown?
= It was grown out of water at the nursery, and its air-adapted leaves collapse when submerged. Trim the mush at the base and wait about a month for new underwater-adapted growth. It's transitioning, not dying.
(Q) Why are my Amazon sword's leaves turning yellow?
= Almost always nutrition. Inert gravel gives this heavy root feeder nothing to eat. Upgrade the substrate or add root tabs near the base, refreshing every one to two months.
(Q) Does an Amazon sword need CO₂?
= No. It grows well without CO₂ injection — added CO₂ only speeds up growth that happens anyway.
(Q) How big do Amazon swords get?
= Well over 2 feet tall and nearly as wide at maturity. Plan for a 20-gallon tank or larger, ideally with height.
The Bottom Line
The Amazon sword isn't fashionable. It's just good — forgiving, generous, and capable of doing what a whole shelf of trendier plants can't. Feed its roots, keep the crown clear, and let it settle in.
Start with a healthy PlantedPro Amazon Sword and a bag of PlantedPro Aquarium Soil — the combo that gets it right from day one.
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