Evergreen Agapanthus cultivars are more tender than the deciduous types, and will probably require frost protection in colder regions. Therefore, when temperatures start to drop, consider moving container-grown plants to a sheltered location (such as a greenhouse or south-facing porch), and covering border-grown specimens with a cloche, or double layer of horticultural fleece.

Keep them well-watered during the growing season, applying a balanced liquid fertiliser each month from spring to late summer. Then, in September, gradually ease back on the feeding and watering, allowing the plants foliage to toughen up. By mid-autumn, stop feeding altogether, and only water sparingly throughout the winter.