Halodule uninervis is a seagrass and thrives in saltwater environments. In aquariums, maintain consistent salinity levels. Avoid freshwater as it will be detrimental.

Water changes should be done using pre-mixed saltwater to replicate natural conditions and replenish essential minerals.

Pruning is generally not necessary for Halodule uninervis. Its growth habit is typically rhizomatous, spreading horizontally.

If individual shoots become overgrown or damaged, they can be carefully trimmed at the base with sharp scissors. Remove any decaying material promptly.

Halodule uninervis propagates naturally through its rhizomatous growth, sending out new shoots along the seafloor. In cultivation, fragmentation of healthy rhizome sections with attached shoots can be used.

Ensure each fragment has sufficient root development for successful establishment.

Repotting is not applicable as Halodule uninervis is a marine plant typically grown in a substrate within an aquarium or its natural habitat. It anchors itself with rhizomes and roots.

Transplanting healthy sections to a new suitable location is the closest equivalent.