Java water-dropwort thrives in consistently moist to wet conditions. Water regularly to keep the soil saturated, especially during warmer months and dry spells.

It can be grown in shallow water in ponds or containers, ensuring the roots are always submerged or the soil remains very damp.

Prune Java water-dropwort to maintain its shape and encourage bushier growth. Trim back leggy stems in spring or after flowering. Remove any dead or yellowing foliage promptly.

Regular trimming can also prevent it from becoming too leggy and spreading excessively.

Java water-dropwort is easily propagated by stem cuttings or by division. Take cuttings from healthy stems in spring or summer and root them in water or moist potting mix.

Mature plants can be divided in early spring or fall by carefully separating root clumps.

Repot Java water-dropwort when it becomes root-bound, typically every 1-2 years. This is best done in spring. Use a well-draining potting mix, and consider adding some compost.

If planting in a pond, ensure the pot is heavy enough to sink and does not float.