Triglochin barrelieri thrives in consistently moist to wet conditions. It prefers to be grown in water or waterlogged soil, mimicking its natural wetland habitat.

Avoid letting the soil dry out completely, as this species is semi-aquatic and requires a high level of moisture to flourish.

Pruning for Triglochin barrelieri is minimal and primarily involves removing any dead or yellowing leaves to maintain a tidy appearance. This can be done as needed throughout the year.

Significant pruning is not typically required, as the plant maintains a manageable size and form naturally.

Propagation of Triglochin barrelieri is best achieved through division of established clumps or by sowing seeds. Division can be done in spring, carefully separating the rhizomatous rootstock.

Seeds can be sown in moist soil or shallow water, requiring consistent moisture and warmth for germination.

Repotting is generally only necessary if the plant becomes overcrowded or outgrows its container. This is best done in spring before active growth begins.

Use a heavy, well-draining aquatic potting mix or loam-based compost, and ensure the pot has drainage holes if not submerged in water.