Propagating Hygrophila Polysperma 'Sunset Red' from Cuttings

How to propagate the pink-veined 'Sunset Red' form of Hygrophila polysperma by cuttings, with an important note on its legal status as a US Federal Noxious Weed.

Overview

Hygrophila polysperma is a fast-growing stem plant native to Bangladesh, India, China, and Malaysia, usually positioned toward the back of the aquarium. Its leaves turn pink or orange as they grow closer to the light source, and the 'Sunset Red' selection is prized for its pink-veined, reddish shoots. It is a rapid grower that accepts most water parameters and is propagated from cuttings — an isolated leaf will often root itself.

Propagation Method (Cuttings)

This plant is multiplied by topping: cut off the top half of a healthy stem and replant the trimming. The base left in the substrate grows new leaves from the cut tip and produces side shoots, using its new growth to fill space within days. The 'Sunset Red' coloration carries through cuttings because they are clones of the parent.

Step-by-Step

Select a healthy stem showing strong pink-red coloration at the tip.
Cut the top 5–10 cm with clean scissors.
Strip the lowest 2–3 cm of leaves so they will not rot once buried.
Plant each cutting deeply and separately, spacing them for root growth.
Leave the rooted base in place; it will branch into several new shoots.
Rootless cuttings can be floated until roots appear, then planted.

Conditions for Healthy Growth

It will grow even faster in good light with nutrient-rich water and substrate, and benefits from added CO2; the leaves color pink or orange nearest the light. The plant accepts most water parameters and grows quickly submersed in the aquarium. For the strongest red veining, give it medium to bright lighting and keep it unshaded by taller plants.

Trimming & Maintenance

Given its speed, top and replant about every week to ten days to keep the stand bushy and stop it from shading neighbors. Each trim is also a propagation opportunity: replant the healthy tops and let the bases rebranch. Discard any bare, leggy bases. Always bag and bin trimmings rather than releasing them, given the plant's noxious-weed status.

Common Challenges

Faded color in shade — only leaves near the light develop pink and orange tones.
Leggy lower stems — top regularly and replant the tops.
Rapid overgrowth crowding the tank; trim on a fixed cadence.
Fragments establishing where unwanted — remove stray pieces, never release outdoors.