Both 'Sky' and 'Lydenburg' are well suited to mass display or smaller groups in a mixed border. They are also ideal as container subjects . Being deciduous they can be interplanted with such plants as Chasmanthe floribunda var. 'duckittii` which is winter growing and dormant in the summer. Lobelia anceps, treated as an annual, flowers in summer, producing light blue flowers and is ideal in a mixed border with Agapanthus ' Sky'.

Both these agapanthus require a well-drained, fertile soil . They need to be cut back at the end of the growing season, removing all of the dried leaves and flower spikes. A generous layer of mature compost can be scattered over the surface of the dormant agapanthus. Agapanthus are water wise and do not require excessive watering. Once a week is quite adequate. Approximately every eight years, Agapanthus 'Sky' and 'Lydenburg' need to be lifted after flowering and each clump divided Each division should have at least two growing points. For propagation purposes one growing point is sufficient. Dividing stimulates flowering and within two growing seasons the plants will be back to their best, producing an abundance of flowers.

The other method of propagation is from seed. Unfortunately agapanthus plants cross pollinate readily and consequently one is never sure of what the seed will produce. Seed needs to be sown soon after it is collected, or stored in the fridge (not freezer) until spring. Seed should be sown in deep trays in semi-shade and kept moist. Fresh seed should germinate in 6-8 weeks. Seedlings should be thinned, but not transplanted from their seed trays until the following year. Plants grown from seed will take about four years to flower.

Generally agapanthus are not bothered with pests, but the leaves and flower buds can be affected by red spider mite, mealybugs, thrips and gall midge fly. Apply a full cover spray with a contact insecticide as soon as pests are observed and repeat every two weeks until the infestation has been eliminated.