Echinodorus osiris

Melon Sword Growing & Care Guide

Melon Sword, native to Southern Brazil, is an exceptionally attractive rosette plant featuring slightly wavy, golden-red leaves that develop rich veining. It is an elite background anchor, famed for its massive rosette root system that serves as an elite biological water filter.

Lighting Moderate Light

Water Hardness Aquatic (pH 6.5-7.5)

Substrate Nutrient-rich substrate / sand

Water Temp 18°C - 28°C

Toxicity Pet Friendly (Non-toxic)

Botanical macro photography of Melon Sword (Echinodorus osiris) - Plant AI care database

How to Identify Melon Sword

Melon Sword (Echinodorus osiris) has key botanical markers. Recognizing these features is crucial for successful aquascaping and thriving growth.

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Visual Shape & Growth: Upright rosette of wavy-edged golden-red leaves rising from a central crown.
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Leaf Morphology: Large, lance-shaped bright-green leaves (up to 12-20 inches tall) with prominent longitudinal veins.
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Root & Anchoring Structure: Extremely large, dense white root system designed to absorb massive substrate nutrients.

💡 Plant AI Tip: Take a photo with Plant AI to identify aquatic weeds and diagnose fungal spot diseases in 1 second.

Complete Cultivation & Spawning Guide

Follow our detailed scientific water parameters and care guides to keep your Melon Sword thriving.

pH: 6.5 - 7.5, GH: 4 - 15 dGH. Adapts well to soft or moderately hard water. High nitrates are absorbed rapidly.

Low. Grows perfectly without pressurized CO2, though supplemental carbon accelerates leaf growth and rosette size.

Moderate light. Too high light triggers spot algae on the broad leaf surfaces; too low light stunts leaf vertical growth.

Cut old, yellowing, or algae-covered outer leaves at the very base of the crown. Never prune leaves in half.

A heavy root feeder. Water column fertilization is helpful, but substrate feeding with root tabs is mandatory.

Requires a deep sand or gravel bed (at least 3 inches) to accommodate its massive root network. Feed heavily with root tabs.

Optimal temperature is 18°C to 28°C (64°F - 82°F). Sensitive to severe cold shocks below 15°C.

Enjoys moderate current. Steady water flow delivers carbon and trace minerals directly to its broad foliage layers.

Extremely cichlid-proof and goldfish-proof due to its tough, fibrous leaf structure. Safe for community setups.

Broad leaves easily gather Green Spot Algae. Employ large Nerite snails or Bristlenose plecos to graze leaves.

Best placed in the background. Space rosettes at least 4 to 5 inches apart to accommodate their massive foliage spread.

Common Diseases & Treatment

Iron Deficiency (Chlorosis)

Symptoms: New leaves at the center of the crown turn pale green, yellow, or translucent white.

Action: The classic sign of iron deficiency. Insert iron-rich root tabs near the crown immediately.

Potassium Deficiency

Symptoms: Mature leaves develop tiny, dark-rimmed holes that grow larger, causing the leaf to drop.

Action: Dose water column potassium sulfate or comprehensive liquid fertilizer weekly.

Frequently Asked Questions

Why is my Melon Sword turning green?

Melon Sword turns green under low light. Strong light and comprehensive liquid iron dosing are key to develop and maintain its iconic golden-red leaf color.

Can I trim the leaves if they grow too long?

While you can trim them, cutting a leaf blade will cause the rest of the leaf to decay. It is best to prune the entire leaf from the crown base.

How do I plant Melon Sword correctly?

Dig a small hole in the gravel, place the roots in, and cover them. Then, gently pull the plant upward until the green crown base is visible.

How fast does it grow?

Under moderate light and nutrients, it is a moderate grower, typically producing one new leaf every 7 to 10 days.