Hygrophila polysperma 'Rosanervig'

Hygrophila polysperma 'Rosanervig', commonly known as Sunset Hygro, is a stunning cultivated variety of Indian Waterweed. It is highly sought after for its beautiful pink hues and unique, light-colored veins that become more intense under strong lighting. Growing up to 60 cm tall, this plant is an excellent choice for adding color and vertical structure to the midground or background of an aquarium. Its ease of care and rapid growth make it a favorite among both beginner and experienced aquarists.

Care

Caring for H. polysperma is relatively straightforward. It thrives in moderate to high lighting, which is essential for developing its signature deep-pink coloration. While CO₂ supplementation is not mandatory, it significantly enhances growth and color vibrancy. The plant appreciates a nutrient-rich environment, so regular fertilization, especially with iron, is recommended to prevent color fading and promote healthy growth. It is highly adaptable to a wide range of water parameters.

Propagation

Propagation is simple and is primarily done through cuttings. To propagate, snip a healthy stem of at least a few inches long and remove the leaves from the bottom node. Plant the cut end into the substrate, where it will quickly develop roots and grow into a new plant. This method allows for easy and rapid multiplication, helping to create a dense, bushy appearance in the aquarium.

Trimming

Regular trimming is key to maintaining the health and appearance of Hygrophila polysperma 'Rosanervig'. Pruning the top shoots encourages the plant to send out side shoots, resulting in denser, more compact growth. Trimmings can be replanted to propagate new plants. Consistent trimming prevents the lower parts of the stems from becoming leggy and losing their leaves due to lack of light.

Notes, Tips, and Considerations

• The distinctive light coloring of the leaf veins is caused by a plant-specific virus that prevents chlorophyll production around the leaf ribs; this virus is harmless to other plants.
• The parent species, Hygrophila polysperma, is considered invasive in some parts of the world. Always dispose of trimmings responsibly by letting them dry out completely before throwing them away.
• Under very high light and low nitrate conditions, the plant may exhibit a creeping growth habit, growing horizontally along the substrate.

Origin

• Regions
  • Asia
    • Directions: South, East
    • Countries: India, Malaysia
• Environment
  • Habitat: marsh, pond, lake, river
  • Water Type: freshwater
  • Water Depth: 0.2 – 2 m
  • Water Flow: still, slow
  • Light: medium, high
  • Temperature: 18 – 30 °C
  • Humidity: high
  • Substrate: mud, soil, sand

Closing

With its brilliant coloration and undemanding nature, Hygrophila polysperma 'Rosanervig' is a fantastic choice for aquarists looking to introduce a splash of vibrant pink and red into their aquascape. Its rapid growth and simple propagation make it a rewarding plant for any freshwater tank.