Proserpinaca palustris – Mermaid Weed Proserpinaca palustris, commonly known as Mermaid Weed, is a beautiful stem plant prized for its unique, finely serrated leaves and attractive colour changes. Under stronger lighting, the new growth can develop vibrant orange, red and copper tones, creating a striking focal point in planted aquariums. It grows upright and can be trimmed regularly to encourage bushier growth. Mermaid Weed is a great choice for the midground or background and works especially well in nature-style aquascapes. Care Level: Medium Light: Medium–High CO₂: Recommended Growth: Moderate Placement: Midground–Background Propagation: Stem cuttings