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How to Grow Radican Sword

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Radican Sword

Echinodorus cordifolius

aquatic plant

Echinodorus cordifolius is a popular aquatic stem plant native to South America, featuring heart-shaped leaves that range from green to reddish depending on light conditions. It is commonly used in aquariums and water gardens for its attractive foliage and relatively easy care requirements. The plant can grow both submerged and emergent, making it versatile for various aquatic setups.

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Example Radican Sword timeline · Pittsburgh, PA (Zone 6b)

  1. Plant Radican Sword

    Around Apr 17

    Near Pittsburgh's average last spring frost.

  2. Tend & protect

    Late spring–summer

    Watering, feeding, and pest-watch reminders.

  3. Harvest Radican Sword

    Late summer into fall

    Before the first fall frost (≈ Nov 8)

Sample dates for Pittsburgh, PA. Sign up to get exact Radican Sword dates for your own zip code.

Growing Conditions

☀️
Sun:
💧
Water: {"ph"=>"6.0-7.5", "changes"=>"Weekly 25-30% water changes recommended", "hardness"=>"Tolerates soft to moderately hard water (4-15 dGH)", "temperature"=>"72-82°F (22-28°C)"}
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Spacing: 6-12 inches between plants, depending on desired density inches
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Days to maturity:
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Planting depth: Plant with crown at substrate surface; bury roots 1-2 inches deep

Soil

Growing Zones

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Thrives in warm tropical and subtropical climates (zones 10b-11), typically grown in controlled aquatic environments

10b 11a 11b

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Growth Stages

1

Establishment

2-4 weeks

Plant develops new roots and acclimates to tank conditions; initial leaves may melt

Maintain stable water parameters; avoid moving plant frequently; ensure gentle water circulation

2

Vegetative Growth

4-8 weeks

Plant produces new leaves regularly; stems elongate; leaves become larger and more vibrant

Maintain consistent lighting and fertilization; prune runners if not desired; monitor for nutrient deficiencies

3

Runner Production

Ongoing during growth

Plant sends out horizontal runners with small plantlets; nodes develop on runners

Leave runners attached to mother plant for continued nutrient flow; propagate new plants once they develop roots

4

Emergent Growth (Optional)

Varies with conditions

If grown emersed or semi-aquatic, plant produces aerial leaves and small white flowers on inflorescences

Maintain high humidity; provide bright indirect light; keep substrate moist but not waterlogged

Companion Planting

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Common Pests

  • Maintain proper light duration (10 hours max); increase plant density; perform regular water changes; use algae-eating fish like Amano shrimp or otocinclus

  • and

    Remove dead matter promptly; ensure adequate water circulation; avoid burying the crown; maintain substrate cleanliness

  • Add all-in-one liquid fertilizers or root tabs; test water parameters; increase water change frequency; enhance lighting

  • Manual removal; introduce snail-eating fish like pufferfish (if compatible); reduce feeding to limit snail food sources

Uses

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Aquascaping and Tank Beautification

Aquatic landscape

Echinodorus cordifolius is extensively used in freshwater aquariums as a mid-ground or background plant, creating natural-looking planted tank layouts. Its heart-shaped leaves and color variations add visual depth and aesthetic appeal to aquatic designs. [source]

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Aquatic Animal Habitat

Wildlife

Provides shelter, shade, and spawning grounds for fish and invertebrates; creates biofilm surfaces for fry to feed on. Dense plantings offer refuge for small fish species and breeding stock. [source]

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Water Quality Improvement

Household

As a rooted aquatic plant, Echinodorus cordifolius absorbs excess nutrients (nitrates, phosphates) from the water column, helping reduce algae growth and maintain clearer, healthier aquarium water. [source]

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Traditional Botanical Use

Medicinal

In its native South American range, related Echinodorus species have been used in traditional folk medicine for digestive and diuretic properties, though scientific evidence is limited. [source]

This is not medical advice. LizPlants is not a medical resource. Always consult a qualified healthcare professional before using plants medicinally.

Fun Facts

  • 🌱 Echinodorus cordifolius can transform from a fully submerged aquatic plant to an emergent semi-aquatic plant; when grown emersed, it produces delicate white flowers on tall inflorescences—a dramatic transformation aquarists rarely see.
  • 🌱 The common name 'Radican Sword' refers to the plant's radican roots (roots that develop along the stem) and sword-like leaf shape; it is also called 'Ovate Sword Plant' due to its distinctly heart-shaped leaves.
  • 🌱 Under high light and CO₂ supplementation, this plant can develop striking reddish or crimson leaf coloration, particularly on new growth—a phenomenon caused by increased anthocyanin pigment production as a light-protective mechanism.

Gardening Terms

New to gardening? Learn about terms used in this guide:

pH Runner
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