Ludwigia Repens Propagation Guide: Cuttings for Red Stems

Ludwigia repens is one of the easiest red stem plants to propagate, and cuttings let you turn a single stem into a tidy red-topped cluster. This guide explains how to cut at a node, replant tops, and manage the side shoots that form at the trimmed base. It also covers the lighting, CO2 and fertilisation that bring out the pinkish-red to deep red colour, since this hardy plant grows even without CO2 but rewards stronger light with a vivid ombre effect.

Overview

Ludwigia repens is a mat-forming perennial herb with a creeping stem up to 30 centimetres long that roots at the nodes where they contact wet substrate. The leaves are oppositely arranged and up to 4 to 5 centimetres long, and it is native to parts of the Americas.

In high lighting, the leaves at the top of the plant grow pinkish-red to deep red, creating a unique ombre effect. It is a fast grower that is not picky about water parameters, which makes it a good indicator plant for nutrient levels.

Propagation Method (Cuttings)

Propagation is done with cuttings. Cut the stem at a node some distance below the final height you want the plant to reach, then replant the top. New shoots appear at the base of the cut stem, so a single plant steadily multiplies.

Removing the top encourages lateral buds to develop, branching the stem into a bushier form. Higher light, at least some CO2 (10 ppm and up) and well-balanced higher-nutrient fertilisation all increase branching and side shoots, producing denser bushes after repeated pruning.

Step-by-Step

1. Cut a healthy stem at a node, leaving 5 to 10 cm of top growth.
2. Strip the lower leaves so a clean node can sit in the substrate and root.
3. Replant the top directly; stagger heights, shorter at the front and taller at the back, for a sloped cluster.
4. As new shoots appear at the base of the cut stem, trim off any outlying shoots that break the slope.
5. Repeat over several cycles to build tidy, dense clusters.

Conditions for Healthy Growth

The plant is not particularly fussy about water parameters but requires higher light to show good colouration; around 70 to 80 umols of PAR is sufficient for good colour, and higher levels also drive more side shoots. CO2 is optional, yet adding at least 10 ppm improves both colour and branching.

Trimming & Maintenance

After cutting, new shoots emerge at the base of the stem. Cut off any outlying shoots that do not match the slope of the cluster, and over time this produces tidy clusters of plants. Replant vigorous tops whenever lower stems start to shade out and weaken.

Common Challenges

Without enough light the plant stays green instead of red, since the colour is light-driven. Because it converts between emersed and submerged growth, newly added stems may reshape or shed leaves as they adapt; keep light and nutrients steady and the submerged growth will colour up.