Mermaid Weed (Proserpinaca palustris)

Mermaid Weed (Proserpinaca palustris) is a unique and highly sought-after stem plant known for its finely serrated leaves and incredible color transformation. In lower light, the foliage remains bright green, while under high lighting and nutrient-rich conditions, it develops stunning shades of orange, copper, and deep red, making it a true centerpiece in any planted aquarium.

Its distinctive saw-toothed leaves provide a texture unlike most aquarium plants, creating beautiful contrast against finer stem plants and broad-leaf species. Mermaid Weed grows upright and responds well to regular trimming, allowing it to form dense, colorful groups in the midground or background.

With proper lighting, fertilization, and CO₂, Mermaid Weed becomes one of the most striking accent plants available for Dutch-style and nature aquascapes.

Care Guide

Difficulty: Moderate

Growth Rate: Moderate

Placement: Midground to Background

Lighting: Medium to High (High light produces the best orange and red coloration)

CO₂: Recommended for optimal growth, compact form, and vibrant color

Temperature: 20–28°C (68–82°F)

pH: 5.5–7.5

Water Hardness: Soft to moderately hard

Propagation: Trim healthy stems and replant the cuttings into the substrate. Regular pruning encourages branching and fuller growth.

Why You'll Love It

• Unique serrated leaves unlike most aquarium plants
• Beautiful green, orange, copper, and red coloration
• Excellent focal point for planted aquariums
• Adds outstanding texture and contrast to aquascapes
• Forms dense, bushy groups with regular trimming
• Easy to propagate through stem cuttings