Syngonanthus sp. 'Belem' (Syngonanthus sp. 'Belem') Care Guide
A rare and challenging stem plant with star-shaped whorls of narrow leaves creating a Tonina-like appearance. Demands very soft, acidic water and high CO2, reserved for the most dedicated aquarists.
Compiled by Aquairi from published sources · Published · Updated
Overview
Syngonanthus sp. 'Belem' is an aquatic plant in the family Eriocaulaceae. A rare and challenging stem plant with star-shaped whorls of narrow leaves creating a Tonina-like appearance. Demands very soft, acidic water and high CO2, reserved for the most dedicated aquarists.
Taxonomy
- Family: Eriocaulaceae
- Genus: Syngonanthus
- Scientific name: Syngonanthus sp. 'Belem'
- Other names: Tonina-like plant
Habitat
A horticultural form of the genus Syngonanthus (family Eriocaulaceae) introduced into the hobby from the Belém region of northern Brazil. Forms a tight rosette of fine grass-like leaves and prefers soft, acidic water.
Growth requirements
- Light: high (≥80 PAR at substrate)
- CO2: pressurised CO2 recommended
- Temperature: 22-28 °C
- pH: 5-6
- GH: 0-3 °dGH
- Substrate: nutrient-rich aquasoil or fertilised gravel
- Nutrient demand: high
- Growth rate: slow
- Difficulty: advanced
Placement
- Recommended placement: midground
- Maximum height: 25 cm
- Trim every: 30 days
Propagation
In cultivation the plant is propagated by stem cuttings (replant the upper portion after trimming).
Propagating Syngonanthus sp. 'Belem' from Cuttings
Overview
Syngonanthus sp. 'Belem' is an advanced star plant from the family Eriocaulaceae, with whorls of narrow leaves. It was first introduced to the hobby as 'Tonina sp. belem' before botanists confirmed it belongs to the genus Syngonanthus. The most common related species, Syngonanthus macrocaulon, is found in the Amazon in very soft blackwater rivers.
Propagation Method (Cuttings)
'Belem' is propagated by cuttings and lateral-shoot division. Because it is slow-growing and resents heavy trimming, you propagate by selectively removing the tallest growth heads rather than topping the whole plant at once, leaving lower heads to continue developing.
Step-by-Step
- Identify the tallest, healthiest growth head and pick it off at the point where it connects to the main stem.
- Leave at least a couple of growth heads behind on the parent so it can keep growing.
- Strip the lowest leaves from the harvested shoot to expose a short bare stem.
- Replant the bare stem firmly into aquasoil; it will root and form a new plant over time.
Conditions for Healthy Growth
A nutrient-rich, acidic soil substrate is a significant advantage; aquasoil is the recommended substrate. It needs good light levels and should not be shaded, and CO2 injection should be present, though it need not be high. Maintain very soft, acidic water for stable growth.
Trimming & Maintenance
Trim conservatively and infrequently. Slow-growing bushes such as Syngonanthus are typically replanted only once every four months or so, harvesting the tallest heads each time and replanting the healthiest portions.
Common Challenges
The biggest risks are hard water and unstable parameters, which cause the plant to melt. Insufficient light or shading from faster neighbours stunts it, and cutting off all growth heads at once can stall or kill the stem. Keep KH very low, light strong, and trimming gentle.