Propagating Rotala 'Ceylon' from Cuttings

How to propagate Rotala ceylonica ('Ceylon') by cuttings, encouraging its pink-tinged whorled growth with bright light, stable CO2 and patient replanting.

Overview

Rotala ceylonica, sold in the hobby as Rotala 'Ceylon', belongs to the genus Rotala in the loosestrife family (Lythraceae), a group of around 46 species of marsh and aquatic plants from tropical Asia, including the Indian subcontinent and Sri Lanka. As its name suggests, this Sri Lankan Rotala is a stem plant with finely whorled leaves that flush pink to red under bright light. It is a more demanding member of the group and is multiplied, like all aquarium Rotala, by cuttings.

Propagation is vegetative: each cutting is a clone of the mother plant, so a healthy donor reliably yields uniform new stems. The challenge with 'Ceylon' is less the cutting itself than holding the strong, stable conditions that keep the pink whorls dense and tight.

Propagation Method (Cuttings)

All aquarium Rotala, including 'Ceylon', are propagated by cuttings, and side shoots form from the base of a topped stem. You simply chop the top of a stem and replant it in the substrate; the remaining base branches and pushes new shoots. Because 'Ceylon' branches less freely than easy rotundifolia forms, patience and good conditions matter when building up a group.

Step-by-Step

1. Select a vigorous stem with healthy, well-coloured whorled tips.
2. Cut the top 5–10 cm just below a leaf whorl with clean scissors.
3. Strip the leaves from the lowest 2–3 cm to expose clean nodes.
4. Push the bare base into nutrient-rich substrate, keeping stems lightly spaced.
5. Leave the trimmed mother stem in place to branch from its remaining nodes.
6. To bulk up faster, lay extra shoots horizontally so several nodes can root.

Conditions for Healthy Growth

'Ceylon' tolerates a moderate range of water hardness and can grow without CO2 injection after acclimatisation, but it rewards stronger conditions. Roughly 80+ µmol of PAR promotes better colouration, and with ample light plus CO2 the plant grows denser and more colourful. Higher nutrient levels combined with CO2 encourage more side shoots and a bushier habit. Submersed growth shows the typical narrow whorled leaves; it can also be grown emersed, which is a practical way to bulk up stock.

Trimming & Maintenance

Top the stems as they reach the upper third of the tank, replanting the cut tops and letting the bases re-branch. With its medium growth rate, 'Ceylon' needs trimming roughly every two weeks rather than the near-weekly cadence of faster rotundifolia clones. Regular topping keeps the group compact and continually supplies fresh, plantable cuttings.

Common Challenges

The main difficulties are weak colour and sparse branching when light, CO2 and nutrients fall short — the pink tones fade to plain green and stems stay thin. Crowded planting also shades lower leaves, so thin the group and prune on schedule. Build new stock by topping the healthiest, best-coloured tips and replanting them densely once conditions are stable.