Alternanthera reineckii

Scientific name: Alternanthera reineckii

Family: Amaranthaceae

Usual maximum size in aquariums: 25 - 50 cm (9.84 - 19.69 inch)

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Recommended pH range for the species: 6.2 - 7.1

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

0°C 32°F30°C 86°F

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

Reproduction of the plant: Cuttings

Origin (in the wild): South America

How fast these plants grow: Slow

Recommended substrate: Fine gravel

Demands on lighting: Bright

Ideal placement in a fish tank: Middle

Common Names

Magenta Water Hedge

Origin

Alternanthera reineckii comes from South America, where it is commonly found in the Amazon's slow-moving waters. In its natural environment, it thrives during the rainy season when riverbanks flood. This ability to grow both submerged and emerged shows how adaptable this plant is to different conditions.

Quick Overview

• Ideal For: Ponds, paludariums, aquariums
• Difficulty Level: Medium
• CO₂ Requirements: Beneficial but not essential

Growing Conditions

Alternanthera reineckii can grow both submerged and emerged, but it grows best when submerged in aquariums. The plant needs bright light to stay healthy, and low light will slow its growth a lot. For best results, plant it in nutrient-rich fine gravel. This type of substrate supports its roots and encourages strong growth.

Though CO₂ injection is not required, adding it will boost the plant's growth and help maintain vibrant red coloration. In low-tech setups without CO₂, growth may be slower, but the plant will still thrive under proper lighting and nutrient conditions.

Planting Area

This plant is flexible in where you can place it in your tank. In larger tanks, it's great for the midground or background. In smaller aquariums, it can even be a centerpiece, adding vibrant color. Be careful not to overcrowd the tank, as fish need space to swim freely.

Propagation

Alternanthera reineckii is easy to propagate. The most common method is by cutting the middle shoot and planting it directly in the substrate. This helps the main plant grow thicker and fuller. You can also take cuttings from the side shoots. When planting cuttings, ensure each piece has a few leaves attached and place them in nutrient-rich substrate.

Root tabs or liquid fertilizers should be added to ensure the new plant develops strong roots and vibrant colors.

Difficulty

Alternanthera reineckii is considered medium in difficulty. If you provide it with the right amount of light and nutrients, it’s fairly easy to care for. It's a good option for both beginner and experienced aquarists.

Short Description

Alternanthera reineckii is a stunning plant that stands out because of its red leaves, which provide a beautiful contrast against green plants. This slow-growing species works well in smaller aquariums but also fits perfectly into larger tanks when planted in groups. If it doesn’t get enough light, the lower leaves might fall off, but once lighting is improved, the plant recovers quickly.

Whether you plant it submerged or emersed, it will thrive in your aquarium. A nutrient-rich substrate and regular fertilization, especially with iron, potassium, and micronutrients, are essential to maintaining the plant’s vivid red coloration.

Lighting Requirements

Bright light is essential for this plant. In traditional fluorescent lighting, "bright" is typically considered to be around 0.5 to 1 watt per liter (2 to 4 watts per gallon) of water. For LED lighting, which is more efficient, this would be around 30 to 40 lumens per liter (120 to 160 lumens per gallon). LED lights are often preferred because they produce more light with less energy and generate less heat.

Without sufficient light, the plant's growth will slow down, and you may notice leaf drop, particularly in the lower leaves. To maintain healthy, vibrant growth, ensure the plant receives bright light for at least 8 to 10 hours per day. In high-light setups, providing CO₂ can further boost the plant's health and intensify its red coloration.

Potential Issues

• Browning or Yellowing Leaves: This is often caused by a lack of light or nutrients, particularly iron deficiency.
• Poor Growth: Inadequate lighting or low nutrients can stunt its growth. Ensure sufficient levels of iron, potassium, and other micronutrients to support healthy development.
• Leaf Drop: Insufficient lighting can cause lower leaves to fall off. Increasing the light will help solve this problem.
• Temperature Issues: If water temperature drops below 23°C (73.4°F), growth will slow, and the plant may become stressed.

Overall Appeal

Alternanthera reineckii is a versatile, low-maintenance plant that adds stunning visual contrast to ponds, paludariums, and aquariums. Its red foliage brings a touch of color and vibrancy to any aquatic environment. Whether you’re an experienced aquascaper or a beginner, this plant will thrive with proper care and add lasting beauty to your tank. Regular doses of nutrients, especially iron and potassium, combined with bright lighting and optional CO₂ supplementation, will help the plant maintain its signature red hue.