Grow this agapanthus in a sunny position in fertile, compos-rich soil and water well in spring and summer. It multiplies rapidly and is easy to split. It is best planted at the back of a border because of its tall flower stalks.

In cultivation, Agapanthus inapertus subsp. intermedius becomes more robust in growth with large leaves and tall flower stalks. It is an attractive species with its pendulous, open-faced, mid-blue flowers. It also flowers late in the season (January-February) and although it is deciduous, it does not appear to go completely dormant in Cape Town. In a colder climate the plants would become dormant.

This plant grows easily from fresh seed. See A. praecox for details of how to grow agapanthus from seed.

The leaves are sometimes eaten by caterpillars late in the season and the new growth can also be eaten off by slugs and snails.