Common Centaury prefers consistently moist soil, especially during its active growth and flowering periods. Avoid waterlogging, but do not let the soil dry out completely for extended durations. Watering deeply a few times a week is generally sufficient in dry conditions.

Pruning for Centaury is minimal, primarily focusing on deadheading spent flowers. Removing faded blooms can encourage the plant to produce more flowers and extend its blooming season. If you wish to prevent prolific self-seeding, deadhead before seeds mature. Otherwise, allow the plant to complete its natural life cycle, as it often self-seeds readily, ensuring future generations.

Centaury is most effectively propagated from seeds. Sow seeds directly outdoors in early spring or autumn. They require light for germination, so scatter them on the soil surface and gently press them in without burying. Maintain consistent moisture until germination occurs and seedlings are well-established. Centaury often self-seeds vigorously in favorable conditions, making propagation quite straightforward.

As an annual or biennial plant, Centaury is generally not suited for repotting. It is best grown directly in its final location, whether that's a garden bed or a sufficiently sized container. Transplanting established Centaury plants can be challenging and often leads to stress or failure. If starting from seed indoors, aim to sow in biodegradable pots for minimal root disturbance when moving outdoors.