Broad-leaved lavender is highly drought-tolerant once established. Water deeply but infrequently, allowing the soil to dry out completely between waterings. Overwatering is a common cause of root rot.

During its first year, regular watering is crucial to establish a strong root system, but reduce frequency as the plant matures, especially in humid climates.

Prune broad-leaved lavender after flowering to maintain a compact shape and encourage new growth.

Remove spent flower stalks and trim back about one-third of the plant's size, avoiding cutting into old, woody stems as they may not regrow.

A light trim in early spring can also help remove any winter damage and promote bushiness.

Broad-leaved lavender can be propagated from semi-hardwood cuttings taken in late summer or early autumn.

Select healthy, non-flowering stems about 10-15 cm long, remove lower leaves, and dip the cut end in rooting hormone. Plant in a well-draining potting mix and keep moist until roots develop.

Seeds can also be sown, but germination can be slow and variable.

Repot container-grown Lavandula latifolia every 1-2 years, or when it becomes root-bound. Choose a pot only slightly larger than the previous one, ensuring it has excellent drainage.

Use a well-draining potting mix, ideally one formulated for herbs or succulents. Repotting is best done in early spring before new growth begins, minimizing stress on the plant.