THUNBERGIA - BLACK EYED SUSAN VINE - Pinetree Garden Seeds - Flowers - Annual in Zone 5, but will still grow 5-8 feet, rambling over itself if it is not trellised. Can be a ground cover if you let the vines trail.
Asparagus densiflorus is an extremely versatile perennial, evergreen plant that can be used as a groundcover or container plant in full sun or light shade. Although there are many striking and beautiful South African Asparagus species, most of them have horrendously large or sharp spines. A. densiflorus has only very small, hardly noticeable spines and is an excellent garden plant.