Perennial herb or soft shrub with an erect stem growing up to 2 m tall. The green leaves have usually purplish, glandular-pubescent. Flowers are white, scarcely or noticeably flushed with pinkish mauve.
Take cuttings after flower or during the growing season.
Take 15-20cm cuttings and remove the leaves from the bottom half. Root in a glass of water or moist pottingsoil.