Amazon sword plants root in substrate, not water column, so planting depth and substrate type matter more than most aquatic plants

Amazon sword is a rooted plant that grows from the bottom of your tank upward. Unlike floating plants, it needs to be anchored into substrate with its roots buried and its crown (the point where leaves meet roots) at or just above the gravel surface. The plant will not thrive if you leave it floating or if you bury the crown underwater—both mistakes kill it within weeks.

The basic steps are: prepare a substrate deep enough to hold roots, plant the sword so the crown stays exposed, anchor it if needed, and wait for roots to establish before adding fertilizer. Most swords take two to four weeks to stop uprooting themselves and start growing new leaves.

Key Takeaways

  • Amazon sword roots must be buried in substrate at least 2 to 3 inches deep, but the crown where leaves begin must stay above the gravel line or the plant will rot.
  • Substrate type matters: sand or fine gravel works better than large pebbles because roots can penetrate it and the plant stays anchored.
  • New plants often uproot themselves in the first two weeks; use plant weights or anchor the base gently with a small rock to hold it in place until roots grip the substrate.
  • Wait until the plant shows new growth before adding liquid fertilizer, because fresh plants rely on nutrients already in the substrate and excess fertilizer can cause algae blooms in new tanks.

Choosing and preparing your substrate

Amazon sword roots are thick and fleshy but still need a substrate soft enough to penetrate. Sand is ideal—it holds the plant firmly and roots spread easily through it. Fine gravel (2 to 3 mm diameter) works well too. Large pebbles or coarse gravel do not: roots cannot push through them, the plant stays loose, and it will uproot when fish dig or water current moves it.

Your substrate should be at least 2 to 3 inches deep in the area where you plan to plant. If your tank has only 1 inch of gravel, add more before planting, or the roots will hit the tank bottom and the plant will struggle. Substrate depth is one of the most common reasons Amazon swords fail in new setups.

If your tank already has plants or is established, you do not need to tear it down. Plant the sword in an open spot where it will not shade smaller plants and where you can reach it easily if it needs adjustment in the first few weeks.

Planting the sword step by step

Remove the plant from its pot or packaging and gently rinse the roots under cool water to remove any nursery gel or loose material. Do not scrub or pull the roots apart—they are delicate and damage now means slow growth later.

Dig a hole in the substrate deep enough that when you place the plant in it, the crown (the thick white or pale part where roots meet leaves) sits right at the gravel surface or just barely above it. The roots should be fully buried. If the crown is underwater, it will rot. If the roots are exposed above the gravel, they will dry out and the plant will die.

Lower the plant into the hole and gently pack substrate around the roots with your fingers. Do not compress it so hard that you crush the roots, but firm enough that the plant does not slide around when you release it. The plant will feel loose at first—that is normal.

Anchoring a newly planted sword

New Amazon swords often uproot themselves in the first one to three weeks because roots have not yet gripped the substrate. Fish digging, water current, or even the plant's own weight can dislodge it. If your sword keeps floating up, anchor it temporarily with a plant weight, a small smooth rock placed gently over the base, or a plant anchor clip designed for this purpose.

Do not use anything sharp or heavy enough to crush the crown. A smooth river rock or a commercial plant weight works fine. Once you see new leaves growing from the center (a sign roots are established), you can remove the anchor. This usually takes two to four weeks depending on water temperature and light.

If your sword uproots despite anchoring, replant it when ready. Each time it is exposed, roots dry out and the plant loses progress. If it keeps uprooting after three attempts, move it to a different spot in the tank—sometimes a location with less current or less fish activity makes the difference.

Light and water conditions for growth

Amazon sword grows in moderate to high light. In low light (fewer than 8 hours per day or a single standard aquarium light), the plant will survive but grow slowly and may develop thin, pale leaves. Aim for 8 to 10 hours of light daily and a light source strong enough to cast a shadow on the tank bottom. LED lights rated for planted tanks work well.

Water temperature between 72 and 82 degrees Fahrenheit is ideal. The plant tolerates cooler water but grows much slower below 70 degrees. Water pH does not matter much—Amazon sword adapts to acidic, neutral, or slightly alkaline water. Perform regular water changes (25 to 30 percent weekly) to keep nitrates low and provide fresh nutrients.

When and how to fertilize

Do not fertilize when ready after planting. New Amazon swords have enough stored nutrients to survive the first month, and adding fertilizer to a new or lightly planted tank often causes algae blooms instead of plant growth. Wait until you see new leaves unfurling from the center of the plant—usually three to four weeks in—before adding any fertilizer.

Once the plant is growing, use a liquid all-in-one fertilizer (such as Thrive, Flourish, or a similar product) at the dose recommended on the bottle, usually once or twice weekly. If your substrate contains nutrients (such as aquasoil or root tabs), you may not need liquid fertilizer at all. Watch the plant: if new leaves are large and green, fertilizer is working. If leaves stay small or yellow, increase the dose slightly.

Avoid overdosing. Too much fertilizer causes algae, not faster plant growth. If algae blooms appear, reduce fertilizer to half dose or skip a week.

Common problems and how to fix them

Plant keeps uprooting: The substrate is too coarse or too shallow, or water current is too strong. Move the plant to a calmer spot, add more substrate depth, or switch to sand if you are using large gravel. Anchor it with a weight while roots establish.

Leaves turn yellow or brown: This usually means the crown is buried underwater or the plant is in very low light. Check that the crown is above the gravel line. If it is, move the plant to a brighter location or add a stronger light.

Plant grows very slowly or stops: Low light is the most common cause. Add more hours of light or upgrade to a stronger bulb. If light is adequate, the substrate may lack nutrients—add a liquid fertilizer or root tabs.

Leaves have holes or are eaten: Some fish nibble Amazon sword, especially larger herbivorous species. If damage is minor, the plant will grow new leaves. If damage is severe, move the plant to a tank with less aggressive fish, or accept that it will be a temporary food source.

Frequently Asked Questions

Can I plant Amazon sword in sand only, without gravel underneath?

Yes. Sand alone works perfectly for Amazon sword and is actually ideal because roots penetrate it easily and the plant anchors firmly. Make sure the sand layer is at least 2 to 3 inches deep so roots have room to spread.

How long does it take for Amazon sword to grow tall enough to fill the back of the tank?

Growth rate depends on light, temperature, and fertilizer. In good conditions (high light, 75+ degrees, weekly fertilizer), a healthy sword can grow 1 to 2 inches per week and reach 12 to 20 inches tall within two to three months. In low light, growth is much slower.

What do I do if the crown starts to rot after planting?

Remove the plant, cut away any mushy or dark tissue with a clean knife, and replant it deeper or in a different spot. If most of the crown is rotted, the plant may not recover. Rot usually happens because the crown was buried underwater or the substrate was too wet and airless—check your planting depth and substrate type.

Can I plant multiple Amazon swords close together?

You can, but space them at least 4 to 6 inches apart so they do not shade each other as they grow. Mature swords are wide plants and will compete for light if planted too close. Spacing them also makes it easier to remove or trim one without disturbing the others.

Do I need to trim Amazon sword, and if so, how?

Trimming is optional. If the plant grows too tall or wide, you can cut leaves at the base with scissors. New leaves will grow from the center. Do not remove more than one-third of the plant at once, or growth will slow while it recovers.