Propagating Rotala macrandra 'Variegated' from Cuttings

How to propagate the demanding variegated red macrandra by stem cuttings: cut, replant tops, and dial in soft water, high light, CO2 and iron for healthy variegated growth.

Overview

Rotala macrandra 'Variegated' is a cultivated form of Rotala macrandra, a stem plant of the loosestrife family (Lythraceae) originating from Asia. It carries cream and pink mottling over red leaves, which makes it one of the more striking but also one of the more demanding macrandra cultivars. Like its parent, it is propagated vegetatively from cuttings, so every new plant inherits the variegated colouration of the stem it was taken from.

Propagation Method (Cuttings)

This cultivar cannot come true from any method other than vegetative propagation, so cuttings are the only route. The standard approach for macrandra is to cut the longest stems 5-10 cm from the substrate and replant them in groups. The remaining base sends out side shoots, while the replanted top continues upward growth. Because variegated tissue carries less chlorophyll, expect propagated tops to root and re-establish more slowly than fully green or red stems.

Step-by-Step

Select a healthy, well-coloured stem at least 12-15 cm tall with clear variegation in the upper leaves.
Using clean, sharp scissors, cut the top 5-10 cm of the stem.
Strip the leaves from the lowest 2-3 cm so the buried node is clean and will not rot.
Plant the cutting into nutrient-rich substrate, burying the stripped node; group several cuttings together for a denser stand.
Leave the rooted base in place; it will produce lateral side shoots that can be harvested in the next cycle.

Conditions for Healthy Growth

Variegated macrandra is best grown in soft, acidic, low-alkalinity water. It needs high-quality, intense lighting; around 150 umol PAR at the substrate is firmly in the very-high-light range that drives good density and colouration. CO2 injection (roughly 15-25 mg/L) is vital, but the key with macrandra is stability rather than extreme levels — dips and fluctuations in CO2 quickly cause tip stunting in the finicky cultivars.

Trimming & Maintenance

Trim on a tight cadence — roughly weekly — to keep the group compact and the variegated tops in the light. A planting can be trimmed for several cycles, after which it is best to cut and replant the adapted top portions and uproot and discard the older, deteriorating base. Note that macrandra is fully amphibious: emersed growth differs from the submersed form, so plants converted from emersed culture will reshape their leaves as they adapt underwater.