Agapanthus praecox prefers consistent moisture during its active growing and flowering season, especially when young. Once established, it is remarkably drought-tolerant, requiring less frequent watering. Allow the top few centimeters of soil to dry out between waterings to prevent root rot. Reduce watering significantly in winter, particularly for plants in pots or in areas with winter rainfall.

Pruning Agapanthus praecox primarily involves deadheading spent flower stalks to encourage further blooming and prevent self-seeding, which can lead to invasiveness. Remove any yellow or damaged leaves at the base as needed to maintain a tidy appearance. In colder climates, some gardeners trim back foliage in late autumn, though evergreen types often retain their leaves.

Agapanthus praecox can be propagated by division or from seed. Division is best done in early spring or autumn, carefully separating clumps into smaller sections, each with roots and foliage. Seeds can be sown in spring, but germination can be slow and seedlings may take several years to flower, and may not come true to type.

Repot Agapanthus praecox when it becomes root-bound, typically every 3-5 years. They prefer to be somewhat crowded, so avoid repotting too frequently or into excessively large containers. Choose a pot only one size larger than the current one. Repot in early spring before active growth begins, using a well-draining potting mix.