Callitriche antarctica thrives in consistently moist to submerged conditions. Ensure the substrate remains saturated, and for emergent growth, keep the soil wet. In aquatic setups, maintain clear, oxygenated water.

Avoid allowing the substrate to dry out completely at any stage of its growth cycle.

Pruning is generally not required for Callitriche antarctica unless it becomes overly dense or outgrows its space. If trimming is necessary, use sharp scissors to cut stems back to the desired length.

This can also encourage bushier growth. Remove any decaying or yellowing foliage promptly.

Propagation is straightforward via stem cuttings. Simply snip off healthy stems, preferably with a few nodes, and plant them directly into the substrate or float them in water.

They will readily root and develop into new plants. Seeds can also be collected and sown in moist soil.

Repotting is typically only necessary when Callitriche antarctica is grown in a container and has become root-bound or the substrate needs refreshing. Use a nutrient-rich aquatic soil or a mix of sand and compost.

Plant the rooted stems firmly into the new substrate, ensuring good contact for root establishment.