Crinkled Aponogeton

This is one of the few Aponogeton species that does not need a cool rest period between growth cycles. Aponogeton crispus grows from a tuber and produces long, translucent-green leaves with a wavy edge — the crinkled texture that gives the plant its common name. It is endemic to Sri Lanka.

Each leaf is a narrow, elongated blade with gentle ripples along the margin and a semi-transparent quality that shows the fine parallel veins. The plant reaches 30 to 40 cm, making it a mid-sized background choice. It grows fast at the warmer end of its temperature range, which is 25 to 32 °C — notably higher than most aquarium plants.

A nutrient-rich substrate with root tabs helps the tuber produce strong leaves. CO₂ injection is optional but the plant responds well to it in terms of leaf size and growth rate. pH tolerance is broad at 5 to 8. Moderate light is sufficient; stronger light makes the leaves shorter but denser.

The plant does have a rest period: it may stop growing and shed its leaves for a few weeks, especially after a growth spurt. Leave the tuber in the substrate and it will sprout again. Propagation is by seeds — A. crispus produces flower spikes above the surface that self-pollinate and drop viable seeds into the water.