This is an excellent South African Plectranthus, which grows into a loose shrub about 1.5-2 m in height. It has bold, striking plumes of soft blue flowers that appear in flushes through most of the year, with a brief respite in winter and early spring. The flowers resemble those of Plectranthus ecklonii, which blooms in later summer and autumn, It has attractive scalloped-edged foliage. It will flourish in sun or shade and copes well with dryness. Mine grows with a free-flowering, dwarf pink Justicia carnea nearby; it also looks beautiful meandering through Hydrangea shrubs, as it is in bloom when they flower. It also looks lovely with another South African shrub with rounded blooms of the same hue: Thunbergia natalensis, which likes to grow in semi-shade. In its native environment, it grows in forests and along forest margins. In South Africa, there are some named cultivars, including some with deep purplish-blue flowers, which sound alluring.
Prune the plant back in mid to late winter once flowering ceases, and apply some general fertiliser at the same time. Every few years, replace the plant with a cutting; these strike easily if taken in spring or autumn.