Propagating Ludwigia perennis: A Cuttings Guide

Learn how to propagate Ludwigia perennis from stem cuttings, encourage reddish undersides with bright light, and keep this Onagraceae stem plant bushy through regular topping.

Overview

Ludwigia perennis is an aquatic stem plant in the genus Ludwigia, family Onagraceae, a cosmopolitan but mainly tropical group of about 82 species of aquatic and wetland plants. Grown submersed it forms slender upright stems with green upper leaves and pinkish undersides, and it grows readily in both fully submerged and partly emersed conditions. Because every healthy stem can become a new plant, cuttings are the fast, reliable way to multiply your stock.

Propagation Method (Cuttings)

Like Ludwigia generally, this species spreads vegetatively with ease: a cut section of stem develops its own roots, while the trimmed parent pushes out side shoots from the leaf nodes below the cut. Topping the tallest stems therefore both propagates the plant and thickens the existing group, turning a single line of stems into a fuller midground stand.

Step-by-Step

1. Choose a healthy stem and cut the top 5–10 cm with clean scissors.
2. Strip the leaves from the lower 2–3 cm of the cutting so they will not rot in the substrate.
3. Plant the bare lower stem 2–3 cm deep into nutrient-rich substrate, spacing cuttings a few centimetres apart.
4. Leave the trimmed parent stem in place; within days it sends out side shoots below the cut.
5. Keep light and nutrients steady while new roots and shoots establish over the following one to two weeks.

Conditions for Healthy Growth

Ludwigia perennis is undemanding and grows at a medium pace in 22–28 °C water with a pH around 6–7.5. Medium lighting is enough for green growth, but the colour story is light-driven: as with other coloured stem plants, more light over the tank produces more pigment, so brighter conditions deepen the pinkish undersides. CO2 is optional here, though injection encourages denser, bushier branching.

Trimming & Maintenance

Trim roughly every two weeks. Top the stems before they reach the surface, replant the cuttings to fill gaps, and let the bases branch. Regular topping keeps the stand compact and colourful; left untrimmed, lower leaves shade out and the planting thins from the bottom.

Common Challenges

• Pale or all-green growth: usually too little light — raise intensity to bring out the pink undersides.
• Leggy, thin stems: insufficient light or skipped topping; trim more often to force branching.
• Lower-leaf loss: shading from an overgrown canopy — top the plants and thin the group.
• Melting after replanting: normal brief adjustment, especially on stems transitioning from emersed growth.