As the name carnosum (fleshy) suggests, this is one of the more succulent Pelargoniums.
Old plants can be quite impressive, with a height of up to about 1 m. But with lots of old leaves and flower stalks, big plants may also look rather untidy compared to young specimens with their nice smooth stems.
The stems are sparsely branched, with very variable, deeply incised and often somewhat fleshy leaves up to 20 cm long.
In Sept.-April the flowers appear in up to 50 compact clusters; they are 1-1.5 cm in diameter, white, pinkish or greenish yellow, with reddish markings on the upper petals.
The plants are found on dry flats and rocky slopes from Namibia to the Little Karoo and the Eastern Cape Province.