The sweetly fragrant flowers of Psoralea pinnata appear in small clusters from the stem-tip leaf axils, shaped similarly to peaflowers. The corollas are light to bright blue, mauve or nearly white, often blue with a white patch at the petal bases. The sometimes hairy calyx lobes may be lemon yellow and gland dotted. Flowers are about 2,5 cm long. Blooming mostly happens from spring into autumn, at different times in the subregions of the distribution and sometimes all year round.
Pollination is done by carpenter bees and maybe other insects.
A small fruit pod develops shortly after flowering, hidden in the persistent calyx, its dimensions about 5 mm by 3 mm (Marais, et al, 2017; Manning, 2007; Bean and Johns, 2005; Coates Palgrave, 2002; Pooley, 1993; iNaturalist; http://pza.sanbi.org).