Alternanthera reineckii

Scientific name: Alternanthera reineckii

Family: Amaranthaceae

Maximum size reached under cultivation: 25 - 50 cm (9.84 - 19.69 inch)

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Recommended pH range: 6.2 - 7.1

Recommended water hardness: 4 - 12°dGH (71.43 - 214.29ppm)

0°C 32°F30°C 86°F

Recommended temperature range: 23 - 30 °C (73.4 - 86°F)

Preferred propagation method: Cuttings

Native to: South America

Growth rate: Slow

Recommended substrate: Fine gravel

Lighting requirements: Bright

Ideal placement in tank: Midground

Common Names

Magenta Water Hedge

🌍 Origin

Alternanthera reineckii originates from South America, especially the Amazon Basin, where it grows along flooded banks, in wetlands, and slow-moving rivers. It can thrive in both submerged and emersed conditions depending on seasonal changes, making it a resilient and adaptable aquatic plant.

🔎 Quick Overview

• 🌊 Ideal For: Aquariums, paludariums, ponds
• 🧑‍🌾 Difficulty Level: Medium
• 💨 CO₂ Needs: Beneficial but not essential

🌱 Growing Conditions

Alternanthera reineckii grows best fully submerged in aquariums but can adapt to paludarium conditions when humidity is high. Bright lighting is critical to enhance its signature red and magenta hues and to avoid leaf drop in lower portions of the stem.

Use a nutrient-rich substrate like fine gravel or sand. Regularly supplement with iron and potassium using root tabs or liquid fertilizers. While CO₂ injection is optional, it significantly boosts both growth rate and vibrancy under intense lighting.

🏞️ Planting Area

This plant fits well in the midground or background of aquariums. In smaller tanks, it can serve as a vibrant centerpiece. When planted in groups, it forms a striking, bushy appearance. Leave spacing between stems for better light and water circulation.

🔁 Propagation

Propagation is easy via stem cuttings. Trim a healthy stem just above a leaf node and replant it directly into the substrate. Ensure each cutting has several leaves. Frequent trimming promotes bushier growth and prevents the plant from becoming leggy.

🧪 Difficulty

Alternanthera reineckii is a moderately demanding species that rewards attentive aquarists with bold coloration and healthy form. It prefers stable water parameters, consistent nutrients, and intense light. Best for intermediate hobbyists or ambitious beginners who want to explore colorful aquascaping.

🌿 Short Description

This species is a standout stem plant prized for its deep red to magenta foliage. It grows slowly, making it ideal for Dutch-style and nature-style aquascapes where color contrast is desired. While capable of emersed growth, it reaches its full potential when submerged under high light and nutrient-rich conditions.

💡 Lighting Requirements

High light is essential. Under fluorescent lights, aim for 0.5–1 watt per liter (2–4 watts/gal) or 30–40 lumens/liter with LEDs. Provide 8–10 hours of light daily. In high-light tanks, CO₂ enhances foliage density and pigmentation.

⚠️ Potential Issues

• 🟡 Yellow or Brown Leaves: Often caused by insufficient light or iron deficiency. Improve lighting and fertilization.
• 🐌 Poor Growth: Linked to lack of nutrients or CO₂. Maintain stable conditions and dosing.
• 🍂 Lower Leaf Drop: A sign of inadequate light. Increase brightness and CO₂ if needed.
• 🌡️ Temperature Sensitivity: Prefers water above 23 °C (73.4 °F). Cooler water slows growth.

🌟 Overall Appeal

Alternanthera reineckii is a favorite in the aquascaping world for its bold appearance and colorful accents. It suits a variety of layouts, from minimalist to heavily planted designs. With proper lighting and care, this plant becomes a vibrant, long-lasting feature in both beginner and expert aquariums.