Callitriche aucklandica thrives in consistently moist to submerged conditions. Maintain water levels that keep the substrate saturated, or allow for shallow submersion in aquariums or water features.

Avoid letting the soil dry out completely, as this can stress the plant. Regular monitoring of moisture is crucial.

Pruning is generally not required for Callitriche aucklandica unless it becomes overgrown and sprawls excessively. If trimming is necessary, use clean scissors to remove excess foliage.

This can be done to maintain a desired shape or density, but avoid removing too much at once.

Propagation of Callitriche aucklandica is easily achieved through division or cuttings. Simply divide established clumps into smaller sections, ensuring each has adequate roots.

Alternatively, stem cuttings can be taken and planted directly into moist substrate or shallow water.

Repotting is rarely necessary for Callitriche aucklandica, especially when grown in a pond or aquarium setting where it can spread naturally. If grown in a container, repot only if the plant becomes root-bound, typically every 1-2 years, using a nutrient-rich aquatic soil.