Milky mangrove thrives in consistently moist to waterlogged soil. Water regularly to maintain saturation, especially during drier periods.

Avoid letting the soil dry out completely, as this species is adapted to brackish or saltwater environments and prefers a humid, aquatic setting.

Prune to maintain desired shape and size, and to remove dead or crossing branches. Light pruning can be done anytime, but heavier pruning is best avoided during extreme temperatures.

Removing spent flowers can encourage further blooming and prevent energy waste.

Propagation is primarily through seeds, which are viviparous (germinate while still attached to the parent plant). Seeds or propagules can be sown in brackish water or moist sand.

Cuttings can also be taken from mature stems and rooted in a suitable substrate.

Repotting is rarely necessary for Excoecaria agallocha as it is typically grown in aquatic or semi-aquatic conditions. If container-grown, choose a large pot that can hold water.

Repot only if root-bound, which is uncommon, using a well-draining, brackish-tolerant substrate.