Amazon sword plants make impressive green focal points, but their adult size and root nutrition deserve more attention than their reputation as an easy plant. Give one enough room, keep the crown above the substrate and supply nutrients at the roots.
They can grow successfully without injected carbon dioxide (CO2). A simple planted aquarium with suitable lighting and steady maintenance is often enough; stronger lighting is not automatically better.
Amazon sword care at a glance
| Care point | Practical guidance |
|---|---|
| Common trade names | Amazon sword; several related forms are sold under this name |
| Placement | Background or a spacious central focal point |
| Adult size | Often 12–20 inches tall; some forms exceed 20 inches and spread widely |
| Light | Low to moderate aquarium lighting |
| Substrate | Enough depth for the roots, with an appropriate nutrient source |
| CO2 injection | Optional, not essential for a basic setup |
| Propagation | Separate rooted plantlets produced on a stalk |
Identify the plant and leave room to grow
The name Amazon sword is not a precise guarantee of size. Plants commonly labeled Echinodorus amazonicus or Echinodorus bleherae are also discussed under Echinodorus grisebachii in aquarium references. Ask the grower which form you are buying rather than relying on the small size of the plant in its pot.
Tropica’s profile of ‘Bleherae’ describes an undemanding plant that can become about 8–20 inches tall. Allow width as well as height. Our practical preference is a 20-gallon or larger aquarium for a typical full-size sword, with more space for large forms. A compact cultivar is a better choice when permanent space is limited.
Position the plant where it will not shade every smaller neighbor or block access to equipment. Compare its role with smaller species in our aquascaping plant guide.
How to plant an Amazon sword
- Remove the nursery basket and gently work packing material away from the roots. Rinse away loose debris and inspect for damaged tissue or unwanted hitchhikers.
- Choose a permanent location with space for the mature rosette. Avoid repeatedly uprooting an established plant.
- Make a planting hole and bury the roots. Keep the crown—the point where the leaves emerge—at or just above the substrate surface.
- Gently firm the surrounding substrate without burying the leaf bases.
- If using plain sand or gravel, add aquarium root fertilizer according to its label and keep it properly buried.
Aquarium Co-Op’s planting instructions illustrate the distinction between burying the roots and covering the crown. Sand and gravel can both work; neither supplies a complete nutrient program by itself. Our planted-tank substrate guide compares the main approaches.
Root feeding and fertilizer
A sword develops a substantial root system. Nutrient-rich planted substrate can support it, while inert or depleted substrate usually needs supplementation. Liquid fertilizer can support the wider aquarium, but do not ignore nutrition around the roots.
Follow the particular fertilizer’s dose, placement and replacement schedule. Tablet size and formulation differ, so a universal number of root tabs per month is not useful. Keep a simple record of when you fertilize and compare new leaves over time before increasing the dose.
Aquarium Co-Op’s plant-selection guide highlights the regular root-feeding needs of sword plants. Choose aquarium products appropriate for the animals you keep and use the labeled dose. Do not add iron automatically whenever a leaf changes color.
Lighting, CO2 and water conditions
Use a controllable aquarium light and start with a modest schedule, such as six to eight hours daily. Treat that as an adjustment point, not a requirement for every fixture. Increase light cautiously only when healthy growth and the rest of the setup support it.
Watts per gallon is a poor way to compare modern LED fixtures: electrical power alone does not tell you how much useful light reaches the leaves. Tank depth, shading and fixture placement also matter. Keep the light on a timer so changes are deliberate and repeatable.
No injected CO2 does not mean no carbon dioxide. Plants still use dissolved CO2 already present in the aquarium. Adding a gas system is optional and introduces another variable to manage; it is not the first response to an unhealthy leaf.
Amazon swords tolerate a range of tropical freshwater conditions. David Manthei’s species profile in Tropical Fish Hobbyist notes differences between forms, including their tolerance of harder water. Match conditions to your livestock and avoid changing pH simply to reach a supposed universal sword-plant number.
Melting, yellow leaves and holes: what to check
| What you see | Useful first check |
|---|---|
| Older leaves fade after planting | Transition to submerged growth may be involved. Watch for new growth from a firm crown before assuming the whole plant has failed. |
| Continuing pale or weak new growth | Review the overall nutrient supply, light and planting depth. Color alone does not identify a specific deficiency. |
| Holes or scraped leaf surfaces | Check for physical damage and grazing, including plecos, as well as nutrient history. |
| Algae coating leaves | Review light duration, shading and maintenance. Avoid increasing brightness as an automatic fix. |
| Plant repeatedly comes loose | Check root anchoring and whether digging fish are disturbing it. |
Remove deteriorating tissue and judge recovery by healthy new leaves. Take a weekly photo from the same angle; it makes gradual improvement easier to see than checking repeatedly through one afternoon.
Pruning and propagation
Remove damaged or oversized outer leaves near their base without cutting into the crown. Do not shear all the leaf tips to make a permanently undersized plant. Tropica’s trimming guide recommends selective removal of outer or shading leaves for Echinodorus.
A mature sword may send out a long stalk carrying daughter plants. Wait until a plantlet has its own leaves and roots, then carefully detach and plant it. A loose leaf is not a stem cutting that will reliably produce another sword.
If the parent repeatedly overwhelms the aquarium, move or rehome it and choose a smaller plant. Regular pruning can manage some shade, but it cannot change the mature growth habit you selected.