Pelargonium alternans is a deciduous, succulent or sub-succulent, multi-trunked shrublet with a definite summer dormancy. The whole plant can reach 40-50 centimetres in height, with a 50-60 cm crown of foliage. It is suited for bonsai culture. The white to very light pink flowers appear from late autumn to early summer, and in cultivation it can flower throughout the year, peaking in autumn and early summer. The typical geranium flowers that are 15 mm in diameter have fine pinkish purple lines on the petals and orange stamen.