Propagating Myriophyllum mattogrossense from Cuttings

Myriophyllum mattogrossense is a fast-growing South American milfoil propagated by cuttings: snip the top 3 to 4 inches of a healthy stem, strip the lower leaves, and replant it deep in the substrate while the base sprouts new side shoots. Strong light around 90 PAR, CO2 injection, and a stable nutrient supply produce a dense, branching, sometimes reddish bush. Frequent trimming keeps it fresh, but after several rounds the tired lower stems should be uprooted and replaced with new tops to avoid sparse regrowth and trapped algae.

Overview

Myriophyllum mattogrossense is a feathery milfoil native to the wetlands of South America and commonly used as an aquarium plant. Its submersed stems carry whorled leaves that are finely, pinnately divided, giving the bush its needle-like, fir-tree appearance. Like other members of the genus Haloragaceae, it grows quickly and is propagated almost entirely by stem fragments rather than by seed.

Propagation Method (Cuttings)

This milfoil is multiplied by taking cuttings, also called topping. Across Myriophyllum, propagation is easy: cut off the top 3 to 4 inches of a healthy stem and replant it, leaving the bottom part to sprout new shoots. Mature stems that have already produced side shoots can also be detached near the main stem and replanted once they are a few centimetres in size, each forming a separate new plant.

Step-by-Step

1. Select a healthy, vigorous top with dense whorls of foliage.
2. Cut the top 3 to 4 inches (roughly 8 to 10 cm) of the stem with clean scissors.
3. Strip the lower leaves from the section that will sit in the substrate, since buried internodes will send out roots.
4. Plant the cutting deeply, at least 2 to 3 inches into the substrate; new roots sprout quickly from the internodes.
5. Leave the rooted base in place so it can push out fresh side shoots from below the cut.

Conditions for Healthy Growth

Dense, well-coloured growth depends on a stable nutrient supply through water-column dosing or a rich substrate, adequate carbon from CO2 injection, and a mature tank. Higher light levels around 90 PAR and CO2 injection encourage the plant to branch more profusely and form a denser bush, and bring out the reddish tones the species can develop.

Trimming & Maintenance

Because the species grows fast, frequent rejuvenation keeps the bush fresh and algae-free. After repeated pruning the lower parts of the plant should be uprooted and discarded, with new tops replanted in their place rather than relying indefinitely on the old base.

Common Challenges

An old base that has been trimmed many times sprouts weaker, sparser shoots, so a stale lower stem is the usual cause of thin regrowth. Insufficient light, carbon, or nutrients leads to leggy, pale stems and trapped algae instead of the compact feathery form the plant is grown for.