Propagating Syngonanthus sp. 'Ruby'

How to propagate the demanding red rosette plant Syngonanthus sp. 'Ruby' by dividing its clump and separating side plantlets in soft, CO2-rich water.

Overview

Syngonanthus sp. 'Ruby' is a rosette plant of the family Eriocaulaceae whose narrow red leaves radiate from a central crown like a star. As a member of Syngonanthus, it originates from very soft, acidic blackwater habitats, which is why it is treated as a demanding aquascaping species rather than a fast stem plant.

Unlike stem plants, you do not propagate 'Ruby' by topping and replanting cut tops. It is multiplied by division of the clump and by separating the daughter plantlets that form beside the mother rosette.

Propagation Method (Division / Plantlets)

Eriocaulaceae rosettes grow new leaves outward from a central crown. As the plant matures it produces baby plantlets and side shoots beside the parent, especially after a period of stress such as a change in conditions or being moved. These daughters can later be separated as independent plants.

Division of the clump: separate distinct crowns once they are clearly visible apart from the main cluster.
Lateral plantlets: detach the daughter rosettes that grow next to the mother once they reach a workable size.

Step-by-Step

Wait until the plantlets beside the mother rosette reach a suitable size and the separate crowns are clearly distinct from the main cluster.
Gently uproot the whole clump; the separation between plantlets becomes obvious once it is out of the substrate.
Separate the crowns gently by hand, keeping the integrity of each crown so every piece keeps its own roots and leaves.
For very small plantlets, use tweezers to pick them apart instead of fingers.
Replant each rosette into rich aquasoil, spacing them so they have room to fill in.

Conditions for Healthy Growth

Very soft, slightly acidic water (low GH and KH) as in its native blackwater rivers.
Strong lighting to support the compact rosette and red coloration.
Pressurised CO2 dosed generously, since Eriocaulaceae rosettes are CO2 demanding.
Nutrient-rich aquasoil substrate at the root zone.

Maintenance

Give freshly divided rosettes time to root before disturbing them again. If many daughter plantlets appear at once, the clump can become overcrowded and deteriorate as a whole, so thin and replant the daughters once they reach a usable size rather than leaving them packed together.