Cone-Cup Spikerush thrives in consistently moist to wet conditions. The soil should never be allowed to dry out. Regular watering is essential, especially during warmer months.

If grown in a pond or water garden, ensure the crown remains submerged or at the water's edge.

Pruning is primarily for aesthetic purposes and to remove dead or yellowing foliage. Trim back any unsightly stems or leaves as needed. This can be done throughout the growing season.

Remove any spent flower stalks to maintain a tidy appearance.

Propagation is easily achieved through division of established clumps, typically done in early spring before new growth begins. Seeds can also be sown in moist soil or water.

Divisions should be replanted promptly in suitable wet or submerged conditions.

Repotting is generally not a common practice for Cone-Cup Spikerush, as it prefers to naturalize in its environment. If container-grown, repot into a larger, aquatic-specific pot with heavy soil when the plant becomes root-bound, ideally in spring.