Alternanthera rosaefolia

Scientific name: Alternanthera rosaefolia

Family: Amaranthaceae

Maximum size reached under cultivation: 30 - 50 cm (11.81 - 19.69 inch)

014

Recommended pH range: 5.8 - 7.2

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

0°C 32°F30°C 86°F

Recommended temperature range: 18 - 20 °C (64.4 - 68°F)

Preferred propagation method: Cuttings

Native to: South America

Growth rate: Slow

Recommended substrate: Fine gravel

Lighting requirements: Bright

Ideal placement in tank: Background

Common Names

Magenta Water Hedge

🌍 Origin

Alternanthera rosaefolia originates from South America, thriving in the tropical Amazon Basin where it grows along flooded riverbanks and in humid wetlands. It adapts well to both submerged and emersed conditions, making it a flexible and widely appreciated plant for aquariums and paludariums.

🔎 Quick Overview

• 🌊 Ideal For: Aquariums, paludariums
• 🧑‍🌾 Difficulty Level: Medium
• 💨 CO₂ Requirements: Helpful, especially in high light, but not strictly necessary

🌱 Growing Conditions

Alternanthera rosaefolia thrives when fully submerged in aquariums, but often displays its best coloration when grown emersed in humid paludarium environments. In such setups, stems become stronger and leaf pigmentation deepens. This plant is slow-growing and highly dependent on intense lighting to prevent leaf drop and fading colors.

Use a nutrient-rich substrate, such as fine gravel or sand, and supplement regularly with iron and potassium. This promotes vivid reds and ensures compact growth. It prefers water with a pH of 5.8–7.2 and moderate hardness (4–12 dGH). CO₂ injection is not mandatory, but it can significantly boost growth and intensify pigmentation, especially under bright lighting.

🏞️ Planting Area

With a height reaching up to 50 cm (19.69 inches), this plant is ideal for the background of large aquariums or as a midground focal point in smaller tanks. Plant it in small groups along the back or sides for a dense, bushy appearance. Ensure enough space between stems for light and water circulation to reach lower leaves.

🔁 Propagation

Propagation is simple via stem cuttings. Trim a healthy stem just above a node and replant it into the substrate. Each cutting should include several leaves. Frequent pruning encourages bushier growth and improves shape. Adding root tabs or planting in nutrient-rich soil will help new cuttings establish quickly and maintain the parent plant’s health.

🧪 Difficulty

Alternanthera rosaefolia is moderately challenging and recommended for aquarists with some experience. Bright lighting, regular nutrient dosing, and stable water parameters are the key requirements for success. Without these, growth slows and its vivid red coloration diminishes.

🌿 Short Description

This stunning plant is known for its magenta to deep red leaves and purplish stems that stand out in aquascapes. It’s a favorite in Dutch-style and nature-style aquariums, where color layering and contrast are essential. Its versatility allows it to grow submerged or emersed, though submerged conditions yield the most vibrant appearance. Patience is required due to its slow growth, but the result is a visually striking addition to any setup.

💡 Lighting Requirements

High-intensity light is critical. Use fluorescent lighting of 0.5–1 watt per liter (2–4 W/gal) or LED lighting of 30–40 lumens per liter (120–160 lumens/gal). Provide 8–10 hours of consistent light daily. In high-light tanks, CO₂ supplementation improves foliage density and prevents lower leaf loss.

⚠️ Potential Issues

• 🟡 Yellow or Brown Leaves: Often a sign of low iron or potassium levels or poor lighting. Adjust nutrient levels and improve light intensity.
• 🐌 Poor Growth: Usually caused by inadequate fertilization or unstable water parameters. Maintain consistent care and water quality.
• 🍂 Leaf Drop: Typically occurs in shaded or low-light environments. Increase brightness and ensure adequate CO₂ where possible.

🌟 Overall Appeal

Alternanthera rosaefolia is an eye-catching plant that adds color, contrast, and texture to planted aquariums and paludariums. It flourishes under proper conditions and stands out with its deep red and magenta tones. Although its care demands attention to light and nutrients, the visual rewards are well worth the effort, making it a top pick for hobbyists seeking to elevate their aquascaping game.