Propagating Rotala pusilla from Cuttings

A practical guide to multiplying the fine-leaved dwarf Rotala pusilla by topping and replanting, including the strong light, CO2 and nutrient regime that pushes it toward orange-red.

Overview

Rotala pusilla is a small, fine-leaved species in the genus Rotala, part of the loosestrife family (Lythraceae). The genus holds roughly 46 species ranging across Africa, Asia and the Americas, and several of them are grown as aquarium plants. Pusilla's needle-like foliage forms soft, textured cushions, and it is most effective planted in groups in the midground.

Like other Rotala, it grows as a stem plant and can be cultivated both submerged and emersed. Under strong light the fine leaves take on orange-to-red tints; in dimmer setups it stays green. CO2 injection is recommended to keep the delicate growth tight and well coloured.

Propagation Method (Cuttings)

Rotala is propagated by cuttings, and pusilla is no exception. Cut a few inches off the top of a stem and replant it; new shoots then sprout from the nodes on the remaining stem, so each trimmed plant returns bushier than before. Repeating this builds a dense carpet of fine stems.

Step-by-Step

Select a vigorous stem and snip the top 5-10 cm with clean, sharp scissors.
Pinch off the smallest lower leaves to expose a node for rooting.
Plant the cutting into nutrient-rich substrate, spacing several cuttings to seed a group.
Leave the base stems; nodes below the cut will push new side shoots.
Maintain strong light and CO2 so the fine new growth roots and colours up.

Conditions for Healthy Growth

For richer colour on fine red-capable Rotala, hobbyists use strong light — on the order of high PAR for around seven hours — together with CO2 and balanced fertilisation. Higher nutrient levels also encourage more side shoots and denser branching, which suits pusilla's cushion habit. Loss of lower leaves is the genus's signal that light is too weak.

Trimming & Maintenance

Trim and replant the healthy tops to keep the stand level and dense; the remaining bases branch to fill gaps. Regular topping every couple of weeks keeps the fine foliage compact rather than leggy, and lets you continually expand the planting from your own cuttings.

Common Challenges

Thin, leggy stems — usually too little light for such a fine-leaved plant.
Staying green — without strong light and CO2 the orange-red tints will not appear.
Bare lower stems — the classic Rotala sign of insufficient lighting.