Propagating Rotala 'Mini Butterfly' from Cuttings

A guide to propagating the compact Rotala sp. 'Mini Butterfly' by cuttings, keeping its short internodes and pink hues with high light, CO2 and tidy replanting.

Overview

Rotala sp. 'Mini Butterfly' is a compact selection from the Rotala rotundifolia group in the loosestrife family (Lythraceae). It keeps short internodes and bronze-pink hues, making it a nano-scape accent rather than a tall background stem. Like all aquarium Rotala it is propagated by cuttings, and the cultivar propagates identically to its parent — every cutting is a clone of the mother plant.

Because the plant is small and slow to bulk up, propagation is mostly about patiently topping and replanting tight, well-coloured tops so a dense little group forms over time.

Propagation Method (Cuttings)

Multiply 'Mini Butterfly' by topping: chop the top of a stem and plant it in the substrate, while the trimmed base sends out side shoots. To grow more stems you can also lay a shoot down and plant it laterally in a submersed or emersed setup, forcing several nodes to produce new stems. Lower CO2 injection produces more compact, smaller growth, which suits this cultivar's nano character.

Step-by-Step

1. Pick a healthy stem with short internodes and good pink colour.
2. Cut the top 5 cm or so with clean, fine scissors.
3. Strip the lowest leaves to leave 1–2 cm of bare stem.
4. Plant the bare base into aquasoil, grouping cuttings tightly for a full look.
5. Leave the trimmed base in place so it branches into side shoots.
6. Repeat every couple of weeks as the group fills in.

Conditions for Healthy Growth

'Mini Butterfly' is not a beginner plant: it likes a good amount of light and CO2 is a must. It stays most colourful under the highest lighting levels, so strong light, CO2, iron and lean nitrate hold the pink tones. Lower CO2 injection yields more compact growth, which can be used to keep the plant small — but too little light or CO2 leaves it pale and leggy. It can be grown emersed, which is a useful way to build up stock before submersing.

Trimming & Maintenance

Top the group roughly every two weeks, replanting the trimmed tops and letting the bases branch. Frequent gentle trimming keeps the internodes short and the clump dense; left untrimmed, the plant stretches and loses its compact charm. Each trim doubles as a propagation harvest.

Common Challenges

The biggest issues are reversion to plain macrandra-type green growth and loss of the compact form when light or CO2 dip. Slow bulking is normal for such a small plant, so be patient. Avoid CO2 fluctuations, keep light strong and nitrate lean, and always re-top from the tightest, pinkest shoots to preserve the cultivar's character.