Maintain consistently waterlogged soil for Oenanthe aquatica, as it thrives in aquatic or boggy conditions. The pot should always be submerged in water, or the plant situated directly in a pond or water feature.

Avoid letting the substrate dry out at any point, as this can be detrimental.

Pruning is generally minimal for Fine-Leaved Water-Dropwort. Remove any dead, damaged, or yellowing foliage as it appears to maintain a tidy appearance and prevent disease.

Occasional thinning may be done if the plant becomes too dense, but avoid excessive cutting back.

Propagation is typically done through division or seed. Divide established plants in spring, separating healthy rhizomes with shoots and roots. Sow seeds in cool, moist conditions in autumn or spring.

Seeds may require a period of cold stratification. Cuttings can also be taken from young shoots.

Repotting is usually only necessary for container-grown plants that have outgrown their pot or if the soil needs refreshing. This is best done in spring before active growth begins.

Use a heavy, nutrient-rich soil mix suitable for bog plants and ensure the new container allows for submersion in water.