Propagating Tonina sp. 'Lotus Blossom'

How to propagate the demanding soft-water star plant Tonina 'Lotus Blossom' by lateral side shoots and replanted heads, with the very soft acidic water and CO2 it needs.

Overview

Tonina sp. 'Lotus Blossom' is a cultivated form within the Tonina fluviatilis group, an aquatic plant of the family Eriocaulaceae native to Central and northern South America. Its parent species is widely noted as difficult to grow as an aquarium plant, and the 'Lotus Blossom' form shares that demanding reputation. The plant forms whorled, almost star-like leaves with pale tips that contrast strongly with greener neighbours.

Because this is a named cultivar rather than a distinct species, it does not come true from any practical home method other than vegetative division. You multiply it by encouraging and detaching its own growth, so every new plant is a clone of the parent.

Propagation Method (Cuttings)

Tonina is propagated vegetatively, the same approach used for its parent Tonina fluviatilis. In an aquarium the most reliable routes are lateral side shoots that branch from the main stem and replanted heads taken from the top of a healthy stem. Both produce genetically identical plants and avoid the melt that this sensitive plant is prone to when handled roughly.

Step-by-Step

Choose a strong, actively growing stem with firm, fully coloured whorls.
Cut the top 5-10 cm of the stem, or detach a lateral side shoot where it branches from the main stem.
Strip the leaves from the lowest 2-3 cm so a clean section can be buried.
Plant the bare section into nutrient-rich aquasoil, spacing heads a few centimetres apart.
Leave the trimmed parent in place; it will push new lateral shoots from the cut point for future rounds.

Conditions for Healthy Growth

Tonina species are sensitive soft-water plants that prefer very low carbonate hardness, around 0-2 dKH, and an acidic soil substrate. An aquasoil substrate is a real advantage because it helps lower KH toward zero and supplies the acidic, nutrient-rich root zone these plants want. CO2 injection should be present, though it does not need to be extreme, and good light levels support compact, well-formed whorls.

Trimming & Maintenance

Trim on a regular cadence of roughly every two weeks once the plant is established, taking heads and replanting them to thicken the group while keeping it dense and low. Each top you remove also signals the parent stem to branch, multiplying your stock over successive trims. Grown emersed, Tonina can be raised above water in shallow culture, but the submersed form is what most aquarists keep and propagate.

Common Challenges

Melting after replanting, usually caused by KH too high or unstable water chemistry.
Slow recovery if CO2 or light dip during the cutting's rooting phase.
Loss of the pale tip contrast when nutrients or light are insufficient.
Difficulty overall, since the parent species is recognised as hard to grow in aquaria.