Myriophyllum heterophyllum

Species description

Care, breeding and tankmates

Plant profile

Placement

Midground

It is best placed in the background of large aquariums due to its robust growth and potential height. It can also be an excellent choice for paludariums and open-top tanks, where it can easily transition to its emerged form. Planting it in dense groups creates a strong visual impact.

Botanical form

Stem

As its name suggests, it exhibits pronounced heterophylly. Submerged leaves are finely divided, feathery, and light green. Once the stem breaches the surface, it produces drastically different, stiff, serrated, and often reddish-green emergent leaves.

Growth

Fast

This plant has a fast growth rate, especially when it receives high light and CO2 supplementation. When it breaks the water surface, its growth rate often accelerates further. Regular and sometimes heavy pruning is required to keep it submerged and within bounds.

Substrate

High

Column fertilization

Recommended

Liquid fertilizers are highly effective for the submerged portions, which readily absorb nutrients through their finely divided leaves. A complete NPK fertilizer with trace elements should be dosed regularly. This ensures the plant remains vigorous even before it reaches the surface.

Root fertilization

None

It develops a robust root system and benefits significantly from a nutrient-rich substrate. Root tabs can provide long-lasting nourishment that supports the heavy top growth. Strong roots are necessary to anchor the large, buoyant stems.

Trimming

Occasional

If you want to keep the plant submerged, trim it as soon as it nears the surface and replant the tops. Alternatively, you can let it grow out of the water for a wilder look. Discarding older, leafless bottom sections is often necessary to maintain a tidy appearance.

Propagation

Cuttings

Propagation is very easy through stem cuttings. Snipping a section of the stem and planting it will yield a new plant quickly. Both submerged and emergent cuttings can be rooted with a high success rate.

Sensitivity

Moderate

It is generally a hardy species that tolerates a wider range of temperatures than many tropical plants. However, it requires strong lighting; insufficient light will cause rapid loss of lower leaves. Good water circulation is important to keep the fine submerged leaves clean.

Layout role

Midground, Background

It serves as a striking background plant, providing a unique texture change if allowed to grow emerged. In the submerged state, its feathery green foliage offers a beautiful, soft backdrop. It is ideal for North American biotope setups or large display tanks.