Eriocaulon aquaticum requires consistently moist to submerged conditions. Maintain water levels around the base of the plant, ensuring the substrate remains saturated.

Avoid letting the soil dry out completely, as this can stress the plant. In aquariums, it thrives with water flow that doesn't disrupt its structure.

Pruning is minimal for Eriocaulon aquaticum. Remove any decaying or damaged leaves promptly to maintain plant health and appearance. If the plant becomes overgrown in an aquarium, you can carefully trim back the foliage.

This is typically done with sharp scissors to avoid tearing the leaves.

Propagation is usually achieved through division or by collecting offsets. Mature plants may produce small side shoots that can be carefully separated and replanted in moist substrate or submerged.

Allow these divisions to establish for a few weeks before treating them as independent plants.

Repotting is generally not necessary unless the plant outgrows its container or the substrate needs replenishing. If repotting is required, use a nutrient-rich, silty substrate.

Handle the root system gently to minimize transplant shock. Ensure the new location provides consistent moisture or submersion.