Water Linum narbonense regularly during its first growing season to establish a strong root system. Once established, it becomes quite drought-tolerant, requiring less frequent watering. Allow the top few centimeters of soil to dry out completely between waterings, especially in cooler weather, to prevent root rot. Avoid overwatering, as this plant prefers drier conditions.

Prune Linum narbonense lightly after its main flush of flowers to encourage a second, smaller bloom and maintain a tidy shape. Deadhead spent flowers regularly to prevent self-seeding and prolong the flowering period. In late autumn or early spring, cut back any dead or leggy stems to promote fresh, vigorous growth.

Linum narbonense can be propagated by seed or by softwood cuttings. Sow seeds directly outdoors in spring after the last frost, or indoors 6-8 weeks prior. For cuttings, take 5-10 cm non-flowering shoots in early summer, remove lower leaves, dip in rooting hormone, and plant in a well-draining mix.

Repotting is generally not a frequent requirement for Linum narbonense, as it prefers to be somewhat root-bound and is often grown in the ground. If grown in a container, repot every 2-3 years in early spring into a slightly larger pot with fresh, well-draining potting mix. Ensure the new pot has adequate drainage holes.