Cape Marigold

Osteospermum
Also called Dimorphoteca, these are not the true Marigold ( Tagetes ) though are distant relatives. They are used for edging, massing and planters. The very showy flowers have additional value in attracting butterflies.
Most species require full sun and are hardy zones 8 to 10. They thrive on well drained soils and are very drought and salt tolerant. Insects and diseases do not often attack these plants. Propagation is easy from seed sown after threat of frost has passed or cuttings taken during summer. The seeds should be sown on surface or covered very lightly and kept moist until germinating. Young plants should be pinched to encourage dense habit.
A highly recommended external site on these great plants is
www.osteospermum.com/

* photos taken on May 17 2012 in Columbia, MD

* photo taken on Dec 6 2015 in Columbia, MD

* photo taken on May 22 2012 in Columbia, MD

* photo taken on Aug 31 2015 in Columbia, MD

Osteospermum barberae
A moderate growing, succulent perennial, reaching a maximum size of 3 x 3 ( usually much lower ) feet.
The bright purple, pink or white ( with dark eye ), daisy-like flowers are borne mid spring to late summer.
Hardy zones 4 to 9 in full sun.

'Purple Mountain'
A low, spreading, succulent perennial, reaching a maximum size of 10 inches x 3 feet.
The bright purple, daisy-like flowers are borne mid spring to late summer.

Osteospermum ecklonis
A fast growing, shrubby perennial in mild climates ( annual in colder climates ), it can reach a maximum size of 5 x 4 feet though typically about half that. It is rare in its native South Africa while considered invasive in some parts of Australia.
The flowers, up to 3 inches across, are white ( blue beneath ) with a light blue disc.
Hardy zones 9 to 12 ( possibly 8 against protected south facing walls ). In mild climates where it is a perennial, it should be cut back hard yearly to encourage dense habit.

Osteospermum 'Lavender Mist'
A clumping, groundcover perennial, reaching up to 1 x 4 feet.
The flowers are lavender.
Hardy zones 5 to 8