Aponogeton deformis

Aponogeton deformis is native to the streams of Sri Lanka, where it grows in moderately flowing, warm, soft water. Its name refers to the distinctly irregular, almost deformed appearance of its leaves, which are asymmetric with strongly undulate, almost twisted margins. This unusual leaf structure makes it an immediately recognisable and curiosity-inducing plant among collectors. Leaf colour is mid- to dark-green, and the leaves grow to around 20–40 cm in length.

Care for A. deformis is straightforward compared to many Malagasy species. It is tolerant of slightly harder water than most Aponogeton and can establish well in a range of tropical community aquarium conditions. It does not require CO2 injection and will grow reliably under medium light with basic root fertilisation.

Its moderate stature makes it excellent for midground placement, where its quirky leaf shape can be appreciated without dominating the layout. It is a good entry point for aquarists new to the Aponogeton genus.

Light: Medium; 0.3–0.6 W/litre equivalent LED, 10 hours daily suits this species well without triggering early dormancy. CO2: Not required; grows acceptably without supplementation, though gentle CO2 addition improves vigour. Fertilisation: Root tabs every 8 weeks; tolerates a range of nutrient levels and is not demanding. Placement: Midground, planted with bulb half-buried in substrate; space at least 20 cm from neighbouring plants. Propagation: Flowers readily and produces viable seed; can also produce offset bulbs at the base of a mature plant.