Hygrophila corymbosa

Hygrophila corymbosa is indigenous to the marshes, rice paddies, and riverbanks of Southeast Asia, where it naturally grows as an emergent or partially submerged plant in warm, humid conditions. It has become one of the most widely cultivated aquarium plants globally due to its exceptional hardiness and fast, reliable growth. Submerged, the leaves are elongated and bright green, while emersed growth produces a slightly different, more rigid leaf form. Multiple named varieties and cultivars exist, including 'Kompakt', 'Siamensis', and the distinctive 'Star' form, providing aquarists with considerable variety within the species. In the aquarium, Hygrophila corymbosa grows rapidly under a broad spectrum of lighting, from moderate to high, and tolerates both soft and hard water with equal ease. This adaptability makes it a valuable plant for cycling new tanks, out-competing algae, and providing biological filtration. Its large leaves offer shelter for cichlids, larger tetras, and livebearers. Regular trimming is required to keep it tidy in smaller tanks, but its easy propagation turns trimmings into new plantings effortlessly.

Placement Ideal for the background of most aquariums, especially those 50 litres and above. In large tanks it can serve as a dramatic mid-background accent. Plant single stems or loose groups of 3–5 spaced 5 cm apart.

Lighting Tolerates a wide lighting range (20–80 PAR). Growth is faster and more compact under higher light. Even in dimly lit community tanks, this plant survives and provides greenery.

CO2 & Fertilisation Does not require CO2 but benefits from it. Regular liquid fertiliser with nitrogen, phosphorus, and potassium keeps the large leaves healthy and prevents yellowing. Iron supplementation maintains rich green colour.

Propagation Stem cuttings root extremely easily. Take cuttings of 8–15 cm, trim lower leaves, and plant immediately. Roots appear within 5–7 days. Lateral shoots are produced abundantly after each trim.

Trimming Trim tops every 2–3 weeks in active tanks. The plant can grow several centimetres per week under good conditions. Replant healthy tops; discard woody lower portions. Removing lower leaves prevents substrate rot.