Opening at night, the unusual chocolate-scented yellow flowers feature a darkrimmed centre.
B. lyrata has a long flowering season and suits a sunny position at the front of the border. HxS: 1½ftx2ft (45x60cm).
A tuberous, spreading perennial with dark-red scented flowers, the chocolate cosmos thrives in a sunny spot. Mulch in autumn and, in colder areas, lift and store over winter to protect from frosts. HxS: 30inx1ft (75x30cm).