Trichodiadema hallii is succulent plant of the genus Trichodiadema, native to the Ladismith and Calitzdorp areas of the Western Cape Province, South Africa.

A very small, erect shrublet, up to 6 cm tall in habitat, taller in cultivation, with tuberous roots.

The leaves are stiff and hard, and densely packed along the stems so that the internodes are not visible.

The leaf tips have about 10 orange-brown bristles in an erect inclining diadem.

The flower stalks are another easy feature for identification, as they are extremely short and often cannot be seen at all.