Rotala indica (Emergent)

Rotala indica is an Asian aquatic plant widely used in aquariums, and in its emergent form it reveals its true character as a semi-terrestrial marsh plant, producing oval, light-green leaves and modest but charming small pink flowers in the axils of the upper leaves. The emergent form is considerably more robust and substantial-looking than the submerged form, with broader, flatter leaves and a more upright, structured stem habit.

It is an ideal plant for the transition zone of riparian paludariums, growing naturally at the interface of water and moist soil. It tolerates both fully submerged and fully emergent conditions, making it a reliable bridge plant that will naturally colonise the waterline margin of a paludarium without special intervention. The flowers attract small insects in open-top paludarium builds, adding ecological interaction.

Light: Medium to high; 2,500–5,000 lux; pink flowers are produced most abundantly under bright light. CO2/Humidity: No CO2 in emergent form; keep roots in water or saturated substrate. Fertilisation: Monthly dilute all-purpose fertiliser added to the water section. Placement: Plant in substrate at the waterline and allow stems to grow upward naturally into the air zone. Propagation: Stem tip cuttings replanted in substrate root rapidly under bright light.