The most commonly seen species of this plant seems to be the glossy-foliaged Brunfelsia australis (though the naming is a bit hard to verify: it may be Brunfelsia latifolia!), with simple, highly scented flowers appearing in September and October. These open violet in colour, then change to pale blue and then white. The variety of colours on the bush at the one time gives an attractive effect. Another species, which originates in Brazil, is Brunfelsia pauciflora (ht 1-1.5 m), which seems to bloom later in our climate, around November, and has darker, duller leaves and a more open, rangy habit. The flowers are also a little larger than those of Brunfelsia australis/latifolia, but they too open a rich purple hue then fade to mauve and white.
In general, I think Brunfelsia australis/latifolia is a more robust and impressive plant and doesn't have the self-seeding/suckering issues that can happen with Brunfelsia pauciflora. I haven't had these problems so far with the cultivar of Brunfelsia pauciflora called 'Macrantha' (ht 2 m), which has bigger leaves and larger flowers, appearing in October, and I think it is a superior shrub to the species.
Brunfelsia pauciflora enjoys sunny sites, but will also do well in dappled or partial shade. It dislike frosts. It should be pruned back lightly after flowering to promote a dense shape. Propagation is by soft-tip cuttings taken from late spring to early autumn, or from self-sown seedlings that may appear.
Belonging to the Solanaceae plant family, Brunfelsia specimens have berries which are potentially toxic to dogs.