Keep the soil consistently moist but not waterlogged. Seaside Centaury prefers well-drained conditions and can be sensitive to overwatering, especially in cooler temperatures.

Water thoroughly when the top inch of soil begins to feel dry, allowing excess to drain away.

Pruning is minimal for Seaside Centaury. Deadhead spent flowers to encourage further blooming and maintain a tidy appearance. If the plant becomes leggy, a light trim can help promote bushier growth.

Pruning is best done after flowering has finished.

Seaside Centaury can be propagated from seed sown in spring or early autumn. Direct sowing in its final location is often best.

It can also be propagated by dividing established clumps in spring, though this is less common and may require careful handling.

Repotting is rarely necessary for this annual or short-lived perennial. If grown in a container, repot only when the plant is significantly root-bound, ideally in spring before active growth begins.

Use a well-draining potting mix.