Melon Sword (Echinodorus osiris): Ultimate Care Guide

The Melon Sword plant (Echinodorus osiris) is a popular aquarium plant that can be found in many pet stores. This plant is easy to care for and can grow quite large, making it a popular choice for those who are looking to add some greenery to their tank. Melon Swords are native to the tropical regions of South America and can be found in slow-moving rivers and streams. In the wild, they can grow to be over two feet tall. They have long, sword-like leaves that are green with white stripes running down the center. In this guide, we will discuss the best way to care for your Melon Sword plant and help you keep it healthy and happy!

How to Care for Melon Sword

Melon Sword is not difficult to care for, but there are a few things you should know before adding one to your tank.

Lighting Requirement

Melon Sword plants are not very demanding when it comes to lighting, but they will benefit from some supplemental light. Melon Swords will do well in both low and high light conditions, but they may grow faster in higher light. If you are growing your Melon Sword in a low-light aquarium, be sure to provide some floating plants or other cover to diffuse the light and prevent algae growth. Melon Swords are not picky about lighting, so you can experiment a bit to find what works best for your plant. Just be sure to provide some sort of light source for your Melon Sword to thrive.

Melon Sword (Echinodorus osiris)
Melon Sword (Echinodorus osiris)

Temperature Requirement

The Melon Sword aquatic plant is native to tropical areas and requires warm water temperatures to thrive. In its natural habitat, the Melon Sword would grow in water that is around 80 degrees Fahrenheit. While this plant can tolerate a range of different temperatures, it will not do well if the water temperature drops below 60 degrees Fahrenheit for an extended period of time. If you are keeping your Melon Sword in an aquarium, make sure to use a heater to maintain a consistent water temperature. fluctuating temperatures can stress the plant and cause it to become more susceptible to disease.

pH Requirement

Melon Sword plants prefer a neutral to slightly acidic pH range of around six to seven. If your water is too alkaline, you can lower the pH by adding some peat moss to the aquarium. If the pH is too low, you can raise it by adding a small amount of crushed coral to the aquarium. Overall, Melon Swords are not very sensitive to pH changes, but it is important to maintain a consistent pH level to prevent stress on the plant.

CO2 Requirement

C02 injection is not necessary for Melon Sword Plants, but it can help them to grow faster.

Melon Swords are able to adapt to a wide range of CO2 levels, so they are not very sensitive to changes in this area. If you do choose to inject CO2 into your aquarium, be sure to start with a low dose and increase it slowly over time. sudden changes in CO2 levels can cause stress on the plant and lead to problems down the road.

Propagating Melon Sword

The most common way to propagate Melon Sword is through dividing the rhizome. To do this, simply cut the side shoots coming off of the rhizome and replant them in the aquarium substrate. Once the new plant has grown roots, you can cut and replant it once more.

Melon Sword Growth Rate and Height

The Melon Sword aquatic plant grows at a moderate to fast rate and can grow to be quite large, with some specimens reaching up to six feet in height in the wild, although it will only grow to around 12 to 20 inches in height in a home aquarium. Given the size that this plant can reach, it’s important to provide it with plenty of space to grow. Melon Swords prefer being placed in the center of an aquarium, where they have room to spread out and reach their full potential. When Melon Swords are young, they tend to be much smaller in size and will only grow to be a few inches tall. However, as they mature, they will begin to grow much larger and will eventually reach their full height.

Where Can I Find Melon Sword for Sale?

Melon Swords are readily available for sale online and in many pet stores. You can also find Melon Sword plants for sale at some garden centers. Melon Sword plants are very affordable and typically cost between $5 and $10. When purchasing a Melon Sword plant, be sure to look for one that is healthy and free of disease. Avoid buying Melon Swords that have been treated with herbicides or pesticides, as these chemicals can be harmful to your other aquarium plants.

Red Melon Sword vs Red Flame Sword

The Red Melon Sword (Echinodorus osiris) and the Red Flame Sword (Echinodorus rubin), are two red-leaved aquatic plants that are often confused with one another. Both plants are members of the Alismataceae family and both have lanceolate leaves that grow to be around 12 inches long. The main difference between these two plants is their coloration. The Red Melon Sword has dark red leaves with green stripes running down the center, while the Red Flame Sword has bright red leaves with no striping.

When it comes to care, both plants are very similar and have the same requirements. Both plants prefer a neutral to slightly acidic pH level and do best in an aquarium that is densely planted. Both plants also require a consistent water temperature and plenty of space to grow. Melon Swords can reach a height of six feet, while Flame Swords will only grow to be around 12 to 20 inches tall.


The Melon Sword plant is a beautiful and unique addition to any home. With proper care, it can thrive for many years. By following the tips outlined in this article, you can be sure that your Melon Sword plant will stay healthy and happy in your aquarium for a long time to come.

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