Seawrack, a marine plant, requires constant immersion in saltwater. Natural seawater is ideal. In aquariums, maintain salinity around 30-35 ppt. Avoid freshwater as it is lethal.

Ensure water flow is gentle to prevent physical damage to the leaves.

Pruning is generally not required for Zostera marina in its natural habitat. In aquariums, remove any decaying or yellowing leaves to maintain water quality and prevent algae growth.

Use sharp, clean scissors to cut leaves at the base.

Zostera marina primarily propagates through rhizome division and seed dispersal in its natural environment. In cultivation, fragments of the rhizome with attached shoots can be planted in suitable substrate.

Seeds can also be collected and sown in appropriate marine conditions.

Repotting is not applicable to Zostera marina as it is a marine plant typically anchored in substrate or sand beds in its natural environment. In aquariums, it is best established in a deep sand or rubble bed that mimics its natural habitat.