Oryza barthii thrives in consistently moist to waterlogged conditions. Ensure the soil remains saturated, mimicking its natural wetland habitat. During dry periods, increase watering frequency.

Avoid letting the soil dry out completely, as this can stress the plant and inhibit growth, especially for young specimens.

Pruning is generally minimal for Oryza barthii. Remove any dead, damaged, or yellowing foliage as needed to maintain plant health and aesthetics.

In late autumn, after seed production, you can cut back spent stems to ground level to encourage a tidy appearance for the following season.

Propagation is primarily achieved through seed. Sow seeds in moist soil or shallow water in spring. Division of established clumps can also be done in spring.

Ensure good moisture levels for successful germination and establishment, as this species prefers wet conditions.

Repotting is infrequent for Oryza barthii. If grown in containers, repot every 2-3 years into a larger pot when root-bound, preferably in spring. Use a heavy, loam-based potting mix.

Ensure the new pot provides adequate space and depth for the roots and maintains consistent moisture.