Ranunculus ambigens thrives in consistently moist to wet soil. Ensure the substrate remains saturated, especially during the growing season. Avoid allowing the soil to dry out completely, as this can stress the plant.

Water thoroughly whenever the surface of the soil begins to feel slightly dry.

Minimal pruning is required for Water-plantain Spearwort. Remove any dead or yellowing leaves as they appear to maintain a tidy appearance and prevent disease.

Deadheading spent flowers can encourage further blooming throughout the season, though it is not strictly necessary for plant health.

Propagation is typically done by seed or division. Sow seeds in moist, cool conditions in autumn or early spring. Divisions can be made in early spring as new growth emerges.

Ensure divisions have adequate moisture and are planted in suitable wet conditions.

Repotting is generally only necessary if the plant becomes root-bound or outgrows its container. This is best done in early spring before active growth begins.

Use a well-draining potting mix amended with organic matter, and ensure the new pot allows for sufficient moisture retention.